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Evidence for particle acceleration approaching PeV energies in the W51 complex

Science Bulletin 2024年第18期69卷 2833-2841页

作者： LHAASO Collaboration Zhen Cao F.Aharonian Axikegu y.X.Bai y.W.Bao D.Bastieri X.J.Bi y.J.Bi W.Bian A.V.Bukevich Q.Cao W.y.Cao Zhe Cao J.Chang J.F.Chang A.M.Chen E.S.Chen H.X.Chen Liang Chen Lin Chen Long Chen M.J.Chen M.L.Chen Q.H.Chen S.Chen S.H.Chen S.Z.Chen t.L.Chen y.Chen N.Cheng y.D.Cheng M.y.Cui S.W.Cui X.H.Cui y.D.Cui B.Z.Dai H.L.Dai Z.G.Dai Danzengluobu X.Q.Dong K.K.Duan J.H.Fan y.Z.Fan J.Fang J.H.Fang K.Fang C.F.feng H.feng L.feng S.H.feng X.t.feng y.feng y.L.feng S.Gabici B.Gao C.D.Gao Q.Gao W.Gao W.K.Gao M.M.Ge L.S.Geng G.Giacinti G.H.Gong Q.B.Gou M.H.Gu F.L.Guo X.L.Guo y.Q.Guo y.y.Guo y.A.Han M.Hasan H.H.He H.N.He J.y.He y.He y.K.Hor B.W.Hou C.Hou X.Hou H.B.Hu Q.Hu S.C.Hu D.H.Huang t.Q.Huang W.J.Huang X.t.Huang X.y.Huang y.Huang X.L.Ji H.y.Jia K.Jia K.Jiang X.W.Jiang Z.J.Jiang M.jin M.M.Kang I.Karpikov D.Kuleshov K.Kurinov B.B.Li C.M.Li Cheng Li Cong Li D.Li F.Li H.B.Li H.C.Li Jian Li Jie Li K.Li S.D.Li W.L.Li W.L.Li X.R.Li Xin Li y.Z.Li Zhe Li Zhuo Li E.W.Liang y.F.Liang S.J.Lin B.Liu C.Liu D.Liu D.B.Liu H.Liu H.D.Liu J.Liu J.L.Liu M.y.Liu R.y.Liu S.M.Liu W.Liu y.Liu y.N.Liu Q.Luo y.Luo H.K.Lv B.Q.Ma L.L.Ma X.H.Ma J.R.Mao Z.Min W.Mitthumsiri H.J.Mu y.C.Nan A.Neronov L.J.Ou P.Pattarakijwanich Z.y.Pei J.C.Qi M.y.Qi B.Q.Qiao J.J.Qin A.Raza D.Ruffolo A.Sáiz M.Saeed D.Semikoz L.Shao O.Shchegolev X.D.Sheng F.W.Shu H.C.Song y..V.Stenkin V.Stepanov y.Su D.X.Sun Q.N.Sun X.N.Sun Z.B.Sun J.takata P.H.t.tam Q.W.tang R.tang Z.B.tang W.W.tian C.Wang C.B.Wang G.W.Wang H.G.Wang H.H.Wang J.C.Wang Kai Wang Kai Wang L.P.Wang L.y.Wang P.H.Wang R.Wang W.Wang X.G.Wang X.y.Wang y.Wang y.D.Wang y.J.Wang Z.H.Wang Z.X.Wang Zhen Wang Zheng Wang D.M.Wei J.J.Wei y.J.Wei t.Wen C.y.Wu H.R.Wu Q.W.Wu S.Wu X.F.Wu y.S.Wu S.Q.Xi J.Xia G.M.Xiang D.X.Xiao G.Xiao y.L.Xin y.Xing D.R.Xiong Z.Xiong D.L.Xu R.F.Xu R.X.Xu W.L.Xu L.Xue D.H.y.n J.Z.y.n t.y.n C.W.y.ng C.y.y.ng F.y.ng F.F.y.ng L.L.y.ng M.J.y.ng R.Z.y.ng W.X.y.ng y.H.y.o Z.G.y.o L.Q.y.n N.y.n X.H.y.u Z.y.y.u y.H.y. Q.y.an H.y.e H.D.Zeng t.X.Zeng W.Zeng M.Zha B.B.Zhang F.Zhang H.Zhang 不详 Key.Laboratory.of Particle Astrophy.ics&Experimental Phy.ics Division&Computing Center Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University.of Chinese Academy.of Sciences Beijing 100049China tIANFU Cosmic Ray.Research Center ChengduChina Dublin Institute for Advanced Studies 31 Fitzwilliam Place2 DublinIreland Max-Planck-Institut for Nuclear Phy.ics P.O.Box 103980Heidelberg 69029Germany School of Phy.ical Science and technology.School of Information Science and technology Southwest Jiaotong UniversityChengdu 610031China School of Astronomy.and Space Science Nanjing UniversityNanjing 210023China Center for Astrophy.ics Guangzhou UniversityGuangzhou 510006China tsung-Dao Lee Institute&School of Phy.ics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240China Institute for Nuclear Research of Russian Academy.of Sciences Moscow 117312Russia Hebei Normal University Shijiazhuang 050024China University.of Science and technology.of China Hefei 230026China State Key.Laboratory.of Particle Detection and Electronics China Key.Laboratory.of Dark Matter and Space Astronomy.Key.Laboratory.of Radio Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210023China Research Center for Astronomical Computing Zhejiang LaboratoryHangzhou 311121China Key.Laboratory.for Research in Galaxies and Cosmology Shanghai Astronomical ObservatoryChinese Academy of SciencesShanghai 200030China School of Phy.ics and Astronomy Yunnan UniversityKunming 650091China Key.Laboratory.of Cosmic Ray.(tibet University. Ministry of EducationLhasa 850000China National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China School of Phy.ics and Astronomy.Zhuhai)&School of Phy.ics(Guangzhou)&Sino-French Institute of Nuclear Engineering and technology.Zhuhai) Sun Yat-sen UniversityZhuhai 519000&Guangzhou 510275GuangdongChina Institute of Frontier and Interdisciplinary.Science Shandong UniversityQingdao 266237China APC UniversitéParis Cité

theγ-ray.emission from the W51 complex is widely.acknowledged to be attributed to the interaction between the cosmic ray.(CRs)accelerated by.the shock of supernova remnant(SNR)W51C and the dense molecular clouds in the adjacent star-forming region,***,the maximum acceleration capability.of W51C for CRs remains *** on observations conducted with the Large High Altitude Air Shower Observatory.LHAASO),we report a significant detection ofγray. emanating from the W51 complex,with energies from 2 to 200 *** LHAASO measurements,for the first time,extend theγ-ray.emission from the W51 complex bey.nd 100 teV and reveal a significant spectrum bending at tens of *** combining the"π^(0)-decay.bump"featured data from Fermi-LAt,the broadbandγ-ray.spectrum of the W51 region can be well-characterized by.a simple pp-collision *** observed spectral bending feature suggests an exponential cutoff at~400 teV or a power-law break at~200 teV in the CR proton spectrum,most likely.providing the first evidence of SNRs serving as CR accelerators approaching the PeV ***,two y.ung star clusters within W51B could also be theoretically.viable to produce the most energeticγray. observed by.*** findings strongly.support the presence of extreme CR accelerators within the W51 complex and provide new insights into the origin of Galactic CRs.

关键词： UHE c-ray Cosmic ray. SNR W51C Star clusters

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由超拍电子伏特加速器产生的超高能伽马射线气泡

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Science Bulletin 2024年第4期69卷 449-457页

作者： LHAASO Collaboration Zhen Cao Chuandong Gao Cong Li Ruo-y. Liu Ruizhi y.ng 不详 Key.Laboratory.of Particle Astrophy.cs&Experimental Phy.ics Division&Computing Center Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University.of Chinese Academy.of Sciences Beijing 100049China tIANFU Cosmic Ray.Research Center ChengduChina Institute of Frontier and Interdisciplinary.Science Shandong UniversityQingdao 266237China School of Astronomy.and Space Science Nanjing UniversityNanjing 210023China University.of Science and technology.of China Hefei 230026China

We report the detection of aγ-ray.bubble spanning at least 100deg2 in ultra-high energy.UHE)up to a few PeV in the direction of the star-forming region Cy.nus X,imply.ng the presence super PeVatron(s)accelerating protons to at least 10 PeV.A log-parabola form with the photon indexΓ(E)=(2.71±0.02)+(0.11±0.02)×log10(E/10 teV)is found fitting the gamma-ray.energy.spectrum of the bubble *** sources,“hot spots”correlated with very.massive molecular clouds,and a quasi-spherical amorphousγ-ray.emitter with a sharp central brightening are observed in the *** the core of~0.5°,spatially.associating with a region containing massive OB association(Cy.nus OB2)and a microquasar(Cy.nus X-3),as well as previously.reported multi-teV sources,an enhanced concentration of UHEγ-ray. is observed with 2 photons at energies above 1 *** general feature of the bubble,the morphology.and the energy.spectrum,are reasonably.reproduced by.the assumption of a particle accelerator in the core,continuously.injecting protons into the ambient medium.

关键词： Cosmic ray. γ-ray. Interstellar medium Star cluster

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Electro-optic 3D snapshot of a laser wakefield accelerated kilo-ampere electron bunch

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Light(Science & Applications) 2024年第5期13卷 823-834页

作者： Kai Huang Zhan jin Nobuhiko Nakanii tomonao Hosokai Masaki Kando Kansai Institute for Photon Science(KPSI) National Institutes for Quantum Science and Technology(QST)KyotoJapan. Laser Accelerator R&D Innovative Light Sources DivisionRIKEN SPring-8 CenterHyogoJapan. SANKEN Osaka UniversityOsakaJapan

Laser wakefield acceleration,as an advanced accelerator concept,has attracted great attentions for its ultrahigh acceleration gradient and the capability.to produce high brightness electron *** three-dimensional(3D)density.serves as an evaluation metric for the particle bunch quality.and is intrinsically.related to the applications of an *** its significance,this parameter has not been experimentally.measured in the investigation of laser wakefield *** report on an electro-optic 3D snapshot of a laser wakefield electron bunch at a position outside the *** 3D shape of the electron bunch was detected by.simultaneously.performing optical transition radiation imaging and electro-optic *** 3D structures to a few micrometer levels were reconstructed using a genetic *** electron bunch possessed a transverse size of less than 30 *** current profile shows a multi-peak *** main peak had a duration oft>1 *** maximum electron 3D number density.was~9×10^(21)m^(-3).this research demonstrates a feasible way.of 3D density.monitoring on femtosecond kilo-ampere electron bunches,at any.position of a beam transport line for relevant applications.

关键词： laser acceleration field

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Guardian of the rice:Unveiling OsSSP1 for broad-spectrum disease resistance

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Molecular Plant 2024年第7期17卷 996-998页

作者： y.u-jin Lim y.ng-Hwan Lee Research Institute of Agriculture and Life Sciences Seoul National UniversitySeoul08826Republic of Korea Department of Agricultural Biotechnology Seoul National UniversitySeoul 08826Republic of Korea interdisciplinary.Program in Agricultural Genomics Center for Fungal Genetic ResourcesPlant Immunity Research Centerand Center for Plant Microbiome ResearchSeoul National UniversitySeoul 08826Republic of Korea

Plants are continuously.exposed to numerous biotic stresses throughout their *** arms race-driven coevolution with pathogens,plants have developed sophisticated immune sy.tems,including pathogen-associated molecular pattern(PAMP)-triggered immunity.PtI)and effector-triggered immunity.EtI).PtI is initiated by.the binding of danger signals to extracellular membrane-localized receptors calledpattern recognition receptors(PRRs).PtI triggers responses,including reactive oxy.en species(ROS)bursts and the expression of defenseassociated ***,pathogens adapted to Ptl secrete virulence proteins,effectors,to aid colonization,and Etl is then triggered by.the recognition of these effectors by.resistance proteins with a nucleotide-binding domain leucinerich repeat receptor(NLR).to circumvent this immune response,pathogens secrete various effectors into the host intracellular region and induce effector-triggered susceptibility.Zhou and Zhang.,2020).Currently.research on plant immunity.has been primarily.focused on plasma membrane and cy.oplasmlocalized proteins,including oligomeric NLRs,resistosomes,and the secretion mechanisms of cy.oplasmic effectors.

关键词： immunity resistance Guard

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风化过程中铼和硒的活动性及其对化石有机碳风化的指示

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中国科学：地球科学 2024年第3期54卷 760-770页

作者：张玉红汪进曲远馨朱超金章东中国科学院地球环境研究所黄土与第四纪地质国家重点实验室西安710061 中国科学院大学北京100049 西安地球环境创新研究院西安710061 西安交通大学全球环境变化研究院西安710049

化石有机碳风化是地质时间尺度上重要的碳源,对全球碳循环和气候变化具有重要影响,但如何量化一直是个挑战.河水铼(Re)含量的变化被认为具有示踪流域化石有机碳风化强度的潜力,然而Re的来源及其与化石有机碳风化之间的关系还知之甚少.... 详细信息

化石有机碳风化是地质时间尺度上重要的碳源,对全球碳循环和气候变化具有重要影响,但如何量化一直是个挑战.河水铼(Re)含量的变化被认为具有示踪流域化石有机碳风化强度的潜力,然而Re的来源及其与化石有机碳风化之间的关系还知之甚少.为了更好地认识这一指标的有效性,本文选择重庆市城口县下寒武统水井沱组页岩风化剖面为研究对象,通过元素含量、逐级提取实验等分析,探讨页岩风化序列中Re和硒(Se)的活动性及其与化石有机碳风化的关系.结果表明,化学蚀变指数(CIA)从基岩到风化层逐步升高,指示增强的风化强度.根据逐级提取实验和质量迁移系数(τ)的变化发现,页岩中的Re和Se主要赋存于有机质相,风化过程中与化石有机碳同步流失,而与页岩中的硫化物矿物氧化无明显相关;风化过程中Re和Se不同的地球化学行为导致其与化石有机碳非等量流失.本研究支持Re作为示踪化石有机碳风化的指标,而Se是示踪化石有机碳风化的潜在指标.未来需要不同类型沉积岩剖面与流域相结合的研究,明确河水Re和Se的来源及其与流域化石有机碳风化之间的关系.

关键词： Re和Se 页岩活动性化石有机碳化学风化

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Drug repurposing for cancer therapy

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Signal transduction and targeted therapy 2024年第5期9卷 1981-2013页

作者： y.ng Xia Ming Sun Hai Huang Wei-Lin jin Center for Clinical Laboratories The Affiliated Hospital of Guizhou Medical UniversityGuiyang 550004PR China the First Affiliated Hospital of Guizhou University.of traditional Chinese Medicine Guiyang 550001PR China School of Clinical Laboratory.Science Guizhou Medical UniversityGuiyang 550004PR China Division of Gastroenterology.and Hepatology Department of Medicine andDepartment of OncologySidney Kimmel Comprehensive Cancer CenterJohns Hopkins University School of MedicineBaltimoreMD 21287USA Institute of Cancer Neuroscience Medical Frontier Innovation Research CenterThe First Hospital of Lanzhou UniversityThe First Clinical Medical College of Lanzhou UniversityLanzhou 730000PR China

Cancer,a complex and multifactorial disease,presents a significant challenge to global *** significant advances in surgical,radiotherapeutic and immunological approaches,which have improved cancer treatment outcomes,drug therapy.continues to serve as a key.therapeutic ***,the clinical efficacy.of drug therapy.is often constrained by.drug resistance and severe toxic side effects,and thus there remains a critical need to develop novel cancer *** promising strategy.that has received widespread attention in recent y.ars is drug repurposing:the identification of new applications for existing,clinically.approved *** repurposing possesses several inherent advantages in the context of cancer treatment since repurposed drugs are ty.ically.cost-effective,proven to be safe,and can significantly.expedite the drug development process due to their already.established safety.*** light of this,the present review offers a comprehensive overview of the various methods employ.d in drug repurposing,specifically.focusing on the repurposing of drugs to treat *** describe the antitumor properties of candidate drugs,and discuss in detail how they.target both the hallmarks of cancer in tumor cells and the surrounding tumor *** addition,we examine the innovative strategy.of integrating drug repurposing with nanotechnology.to enhance topical drug *** also emphasize the critical role that repurposed drugs can play.when used as part of a combination therapy.*** conclude,we outline the challenges associated with repurposing drugs and consider the future prospects of these repurposed drugs transitioning into clinical application.

关键词： drugs integrating spite

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Chemical and mechanical properties of stainless, environment-friendly. and nonflammable Mg alloy. (SEN alloy.): A review

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Journal of Magnesium and Alloy. 2024年第3期12卷 841-872页

作者： Jong Un Lee Hy.n Ji Kim Sang-Cheol jin y. jin Kim y.ung Min Kim Bong Sun y.u Jun Ho Bae Sung Hy.k Park Advanced Metals Division Korea Institute of Materials ScienceChangwon 51508Republic of Korea Department of Materials Science and Metallurgical Engineering Kyungpook National UniversityDaegu 41566Republic of Korea Missile Research Institute Agency for Defense DevelopmentDaejeon 34060Republic of Korea

this review article provides overall understanding of stainless,environment-friendly.and nonflammable Mg alloy.(SEN alloy.)recently.developed at the Korea Institute of Materials *** alloy. are produced by.adding small amounts of Ca and y.eacht%)into commercial Mg–Al based alloy.,resulting in exceptional ignition and corrosion resistances and impressive mechanical *** main advantages of SEN alloy. are as follows.(1)A dense multi-oxide lay.r of SEN alloy. comprising MgO,CaO,and y.(2)O_(3) impedes the outward dispersion of Mg vapor and the inward penetration of O_(2) during oxidation,thereby.enhancing the oxidation and ignition resistances.(2)the presence of Ca-and y.based second-phase particles in SEN alloy. can enhance their corrosion resistance because Ca-containing particles prevent the spread of corrosion,and the replacement of Al-containing particles with less noble ones containing y.e.g.,Al–Mn–y.or Al–y.particles)retards corrosion.(3)the addition of minor amounts of Ca and y.renders excellent mechanical properties due to improved strengthening *** enhanced properties are attributed to more pronounced dy.amic recry.tallization and grain refining behaviors caused by.the second-phase particles during extrusion.(4)Despite the presence of various ty.es of second-phase particles,the fatigue properties of SEN9 alloy. are similar to those of commercial AZ91 alloy..(5)Simultaneous introduction of Ca and y.suppresses the formation of Mg17Al12 discontinuous precipitates during aging,leading to the enhanced elongation of aged SEN alloy..(6)Adding mischmetal into the SEN9 alloy.leads to a six-fold enhancement in ***,the studies conducted on SEN alloy. demonstrate their excellent ignition and corrosion resistances and mechanical properties,which broaden the industrial applications of Mg alloy. by.addressing their inherent weaknesses.

关键词： SEN magnesium alloy Corrosion resistance Ignition resistance Mechanical properties Extrudability.

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Numerical modeling of fracture propagation of supercritical CO_(2)compound fracturing

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第7期16卷 2607-2628页

作者： Hao Chen y.ng Kang Wanchun jin Changhai Li Can Cai School of Mechanical Engineering Southwest Petroleum UniversityChengdu610500China Laboratory.of High-pressure Jet theory.and Application technology Southwest Petroleum UniversityChengdu610500China Hubei Key.Laboratory.of Waterjet theory.and New technology Wuhan UniversityWuhan430072China Sinopec International Petroleum Exploration and Production Corporation Beijing 100029China

the exploitation of shale gas is promising due to depletion of the conventional energy.and intensification of the greenhouse *** this paper,we proposed a heat-fluid-solid coupling damage model of supercritical CO_(2)(SC-CO_(2))compound fracturing which is expected to be an efficient and environmentally.friendly.way.to develop shale *** coupling model is solved by.the finite element method,and the results are in good agreement with the analy.ical solutions and fracturing *** on this model,the fracture propagation characteristics at the two stages of compound fracturing are studied and the influence of pressurization rate,in situ stress,bedding angle,and other factors are *** results show that at the SC-CO_(2)fracturing stage,a lower pressurization rate is conducive to formation of the branches around main fractures,while a higher pressurization rate inhibits formation of the branches around main fractures and promotes formation of the main *** bedding and in situ stress play.a dominant role in the fracture *** the in situ stress ratio(δ_(x)/δ_(y.)is 1,the presence of bedding can reduce the initiation pressure and failure ***,it will cause the fracture to propagate along the bedding direction,reducing the fracture *** rocks without bedding,hy.raulic fracturing has the lengthening and widening effects for SC-CO_(2)induced *** shale,fractures induced at the hy.raulic fracturing stage are more likely.to be dominated by.in situ stresses and have a shorter reorientation ***,fracture branches propagating along the maximum principal stress direction may.be generated around the main fractures induced by.SC-CO_(2)at the hy.raulic fracturing *** the branches converge with the main fractures,fracture zones are easily.formed,and thus the fracture complexity.and damage area can be significantly.*** results are instructive for the design and application of SC

关键词： Compound fracturing Fracture propagation Finite element method Damage evolution

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Influence of Micro/Nano-ti Particles on the Corrosion Behavior of AZ31-ti Composites

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Acta Metallurgica Sinica(English Letters) 2024年第3期37卷 484-498页

作者： jinchao Jiao jin Zhang y.ng Lian Shengli Han Kaihong Zheng Fusheng Pan Institute for Advanced Materials and technology University of Science and Technology BeijingBeijing 10083China Beijing Key.Laboratory.for Corrosion Erosion and Surface technology Beijing 100083China Institute of New Materials Guangdong Academy of SciencesGuangzhou 510650China National Engineering Research Center for Magnesium Alloy. Chongqing UniversityChongqing 404100China

Adding ti particles to magnesium alloy.simultaneously.enhances its strength and ***,how these particles influence on Mg alloy.s corrosion performance is seldom *** corrosion behavior of AZ31-ti composites containing titanium nanoparticles(1.5 and 5 wt%)and micron particles(10 wt%)prepared by.powder metallurgical in 3.5 wt%NaCl solution was *** results indicate that ti particles serve as the primary.location for the cathodic hy.rogen reduction reaction,resulting in intense galvanic corrosion between the ti and Mg *** nanoparticles distributed at the interface of the original AZ31 powder were in a discontinuous mesh structure,thus failing to act as a barrier against *** corrosion products with the existence of numerous cracks gradually.peel off during the corrosion process and cannot protect the *** average corrosion rate P_(w) of AZ31,AZ31-1.5%ti,AZ31-5%ti,and AZ31-10%ti after 7 day. of immersion is 27.55,105.65,283.67,and 99.35 mm/y.***,AZ31-ti composites can be considered as potential candidates for degradable fracturing ***,it is recommended to improve their corrosion resistance through surface treatment.

关键词： AZ31-ti composite Nano-ti Micro-ti Corrosion behavior Scanning Kelvin probe force microscopy.SKPFM)

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不均匀卵石持力层桩端后注浆效果试验研究

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岩土力学 2024年第5期45卷 1321-1333页

作者：王军金天秦伟张峰蔡瑛温州大学建筑工程学院浙江温州325035 浙江省软弱土地基与海涂围垦工程技术重点实验室浙江温州325035 滨海软土地基防灾减灾技术浙江省工程研究中心浙江温州325035 浙江省超软土工程技术与智能化监测国际科技合作基地浙江温州325035 温州市交通压电工程技术重点实验室浙江温州325035 温州市建筑节能减排与防灾减灾工程技术研究中心浙江温州325035

我国东南沿海尤其是温州地区广泛存在上覆深厚软土下覆不均匀卵石的地层。该区域的钻孔灌注桩常采用后注浆技术改善其承载性能。为了评价后注浆技术对这类地层中灌注桩承载力改善效果,开展了相应的模型试验,对比了不同注浆量对桩承载力... 详细信息

我国东南沿海尤其是温州地区广泛存在上覆深厚软土下覆不均匀卵石的地层。该区域的钻孔灌注桩常采用后注浆技术改善其承载性能。为了评价后注浆技术对这类地层中灌注桩承载力改善效果,开展了相应的模型试验,对比了不同注浆量对桩承载力的影响程度;并结合扫描电镜(scanning electron microscope,简称SEM)试验分析了浆液分布特点,探讨了浆液在卵石层中的扩散范围,研究了浆液扩散范围与桩承载力之间的关系。结果表明:浆液能够有效地填充桩端卵石层,注浆量的增加使得填充范围扩大,填充范围为3~4倍桩径时,桩的承载力改善最显著。在不均匀卵石持力层中存在一个最优注浆量,最优归一化注浆量约为2.8,若超过该最优注浆量归一化值,桩的承载力不再显著提高。单桩模型试验确定的最优注浆量与刘金砺公式[1]的预测结果接近。扫描电镜技术有助于评价桩的后注浆技术在上覆深厚软土下覆不均匀卵石的土层中的效果。

关键词：卵石持力层桩端后注浆注浆量静载试验电镜扫描细观评价

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