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Monotonic uplift behavior of anchored pier foundations in soil overlying rock

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2023年第7期24卷 569-583页

作者： Yizhou sun honglei sun Chong TANG Yuanqiang CAI Feng PAN College of Civil Engineering and Architecture Zhejiang UniversityHangzhou 310058China College of Civil Engineering Zhejiang University of TechnologyHangzhou 310014China State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China Zhejiang Electric Power Design Institute Co.Ltd. China Energy Engineering GroupHangzhou 310012China

Rock-embedded foundations with good uplift and bearing capacity are often used in mountains or hilly ***,there are soil layers with a certain thickness on the rocks in these mountainous areas,and the utilization of those soil layers is a problem worthy of attention in foundation *** construction-and cost-related factors,traditional single-form foundations built on such sites often cannot provide sufficient resistance against ***,an anchored pier foundation composed of anchors and belled piers,specifically constructed for such conditions,can be invaluable in *** paper introduces an experimental and analytical study to investigate the uplift capacity and the uplift mobilization coefficients(UMCs)of the anchored pier *** this study,three in-situ monotonic pullout tests were carried out to analyze the load–displacement characteristics,axial force distribution,load transfer mechanism,and failure mechanism.A hyperbolic model is used to fit the load–displacement curves and to reveal the asynchrony of the ultimate limit states(ULSs)of the anchor group and the belled *** on the results,the uplift capacity can be calculated by the UMCs and the anchor group and pier uplift ***,combined with the estimation of the deformation modulus of the soil and rock,the verification calculation of the uplift capacity and UMC was carried out on the test results from different anchored pier foundations.

关键词： Uplift capacity Anchored pier foundation Belled pier Rock anchor Uplift mobilization coefficient(UMC)

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An approach for determination of lateral limit angle in kinematic planar sliding analysis for rock slopes

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第4期16卷 1305-1314页

作者： Xiaojuan Yang Jie Hu honglei sun Jun Zheng College of Civil Engineering Zhejiang University of TechnologyHangzhou310023China Department of Civil Engineering Zhejiang UniversityHangzhou310058China Center for Balance Architecture Zhejiang UniversityHangzhou310007China The Architectural Design & Research Institute of Zhejiang University Co. Ltd.Hangzhou310063China

Planar sliding is one of the frequently observed types of failure in rock *** analysis is a classic and widely used method to examine the potential failure modes in rock *** accuracy of planar sliding kinematic analysis is significantly influenced by the value assigned to the lateral limit angleγ***,the assignment ofγlim is currently used generally based on an empirical *** study aims to propose an approach for determining the value ofγlim in deterministic and probabilistic kinematic planar sliding analysis.A new perspective is presented to reveal thatγlim essentially influences the probability of forming a potential planar sliding *** procedure to calculate this probability is introduced using the block theory *** is found that the probability is correlated with the number of discontinuity sets presented in rock ***,different values ofγlim for rock masses with different sets of discontinuities are recommended in both probabilistic and deterministic planar sliding kinematic analyses;whereas a fixed value ofγlim is commonly assigned to different types of rock masses in traditional ***,an engineering case was used to compare the proposed and traditional kinematic analysis *** error rates of the traditional method vary from 45%to 119%,while that of the proposed method ranges between 1%and 17%.Therefore,it is likely that the proposed method is superior to the traditional one.

关键词： Kinematic analysis Block theory Planar sliding Lateral limit angle Rock slope

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A universal elliptical disc(UED)model to represent natural rock fractures

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International Journal of Mining Science and Technology 2022年第2期32卷 261-270页

作者： Jun Zheng Jichao Guo Jiongchao Wang honglei sun Jianhui Deng Qing Lv Department of Civil Engineering Zhejiang UniversityHangzhou 310058China Center for Balance Architecture Zhejiang UniversityHangzhou 310007China College of Civil Engineering Zhejiang University of TechnologyHangzhou 310023China State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resource&HydropowerSichuan UniversityChengdu 610065China

Since natural fractures are often non-equidimensional,the circular disc model still has great *** contrast,the elliptical disc model is more applicable to representing natural fractures,especially for slender *** paper developed a universal elliptical disc(UED)model by incorporating the center point,size,and azimuth of fractures as ***,with respect to the azimuth of elliptical fractures in three-dimensional(3D)space,we proposed a paradigm to construct its probability density function(PDF)by coupling the orientation and rotation angle of long axis based on three coordinate *** illustrate the construction process of the PDF of the fracture azimuth,we took the orientation following the Fisher distribution and the rotation angle following Von Mises distribution as an example.A rock slope is used to show the use of the developed UED model,and the 3D DFNs for the slope rock mass are generated by Monte Carlo *** addition,the DFNs for the rock mass are also generated based on the existing circular disc model and non-universal elliptical disc *** comparison results from the three models clearly illustrate the superiority of the UED model over the existing circular and non-universal elliptical disc models.

关键词： Discrete fracture networks Rock mass Discontinuity Elliptical disc model Fisher distribution Monte Carlo simulation

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Multi-objective optimization-based prediction of excavation-induced tunnel displacement

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Underground Space 2022年第5期7卷 735-747页

作者： Yuanqin Tao Wei He honglei sun Yuanqiang Cai Junqiang Chen Research Center of Coastal and Urban Geotechnical Engineering College of Civil Engineering and ArchitectureZhejiang UniversityHangzhou 310058China Institute of Geotechnical Engineering College of Civil EngineeringZhejiang University of TechnologyHangzhou 310000China Institute of Rock and Soil Mechanics Chinese Academy of SciencesWuhan 430061China

This paper proposes an inverse method for improving the prediction of tunnel displacements during adjacent *** this framework,staged data assimilation and parameter identification are conducted using the multi-objective particle swarm optimization *** monitoring data are assumed to be more informative and assigned more weights in the multi-objective optimization to improve the prediction ***,an empirical formula is applied to correct the time effect of tunnel *** Kriging method is introduced to surrogate the finite element model to reduce computational *** proposed framework is verified using a typical staged“excavation nearing tunnel”*** predictions using the updated parameters are in good agreement with the *** identified values of underlying soil parameters are within the typical ranges for the unloading *** updated time effect indicates that tunnel displacements may develop excessively in the three months after the region S1-B is excavated to the *** maximum vertical tunnel displacement may increase from the currently measured 12 mm to the calculated 26 mm if the later construction is suspended long *** constructions need to be timely conducted to restrain the time effect and control tunnel displacements.

关键词： Tunnel displacement Excavation Time effect Multi-objective particle swarm optimization Parameter identification

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Assessment of vaccination strategies against highly pathogenic avian influenza in China

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Frontiers of Agricultural Science and Engineering 2014年第4期1卷 277-281页

作者： honglei sun Jinhua LIU Key Laboratory of Zoonosis of Ministry of Agriculture College of Veterinary MedicineChina Agricultural UniversityBeijing 100193China

Vaccination for highly pathogenic avian influenza(HPAI)has been implemented in China for a decade,however,the virus is still present in poultry.A series of recombinant vaccines,Re-1 to Re-7,have been developed and used,and Re-8 will also be used in clinical settings to prevent the prevailing flu *** question remains,when can China eradicate the disease?Here,we review the epidemiology of H5 HPAI along with the development,usage and problems of *** suggestions for controlling the disease in China are provided.

关键词： highly pathogenic avian influenza vaccine vaccination control

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A spatiotemporal deep learning method for excavation-induced wall deflections

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第8期16卷 3327-3338页

作者： Yuanqin Tao Shaoxiang Zeng honglei sun Yuanqiang Cai Jinzhang Zhang Xiaodong Pan College of Civil Engineering Zhejiang University of TechnologyHangzhou310023China Ministry of Education(MOE)Key Laboratory of Soft Soils and Geoenvironmental Engineering(SSGeo) Zhejiang UniversityHangzhou310058China Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education and Department of Geotechnical Engineering Tongji UniversityShanghai200092China

Data-driven approaches such as neural networks are increasingly used for deep excavations due to the growing amount of available monitoring data in practical ***,most neural network models only use the data from a single monitoring point and neglect the spatial relationships between multiple monitoring ***,most models lack flexibility in providing predictions for multiple days after monitoring *** study proposes a sequence-to-sequence(seq2seq)two-dimensional(2D)convolutional long short-term memory neural network(S2SCL2D)for predicting the spatiotemporal wall deflections induced by deep *** model utilizes the data from all monitoring points on the entire wall and extracts spatiotemporal features from data by combining the 2D convolutional layers and long short-term memory(LSTM)*** S2SCL2D model achieves a long-term prediction of wall deflections through a recursive seq2seq *** excavation depth,which has a significant impact on wall deflections,is also considered using a feature fusion *** excavation project in Hangzhou,China,is used to illustrate the proposed *** results demonstrate that the S2SCL2D model has superior prediction accuracy and robustness than that of the LSTM and S2SCL1D(one-dimensional)*** prediction model demonstrates a strong generalizability when applied to an adjacent *** on the long-term prediction results,practitioners can plan and allocate resources in advance to address the potential engineering issues.

关键词： Braced excavation Wall deflections Deep learning Convolutional layer Long short-term memory(LSTM) Sequence to sequence(seq2seq)

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Study on intelligent control technology for forming steel pipe of pipeline with JCO process

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Science China(Technological Sciences) 2011年第10期54卷 2754-2759页

作者： ZHAO Jun LI Jian QU XiaoYang WANG Gang sun honglei MA Rui College of Mechanical Engineering Yanshan University Qinhuangdao 066004 China Julong Steel Pipe Co. Ltd. Qinhuangdao 062658 China

Based on plastic bending engineering theory and machine vision technology, the intelligent control technology for forming steel pipe with JCO process is presented in this paper. By ‘twice pre-bending method’ in the first forming step, the springback law can be obtained. With the springback law and the target angle, the exact punch displacement which determines the formed angle in each bending step is predicted. In the succedent forming steps, the bending process is carried out with the exact punch displacement by real-time revising the springback law. And the angle error in each forming step is calculated by comparing the actual formed angle with the target angle. By conducting compensation for the last angle error in the next forming step, each precise bending process step is realized. A system of intelligent control technology for forming the steel pipe was developed. A calibration method is proposed to calculate the exterior parameters of the CCD camera, in which the equilateral triangle is em-ployed as the calibrating board and only one image needs to be captured. A mathematical model, which converts the angle in the image into the actual formed angle, is derived. The experimental results showed that the ellipticity of the formed pipes was less than 1.5% and the high-quality pipes can be manufactured without the worker's operating experience by employing the in-telligent control technology.

关键词： steel pipe of pipeline intelligent control technology calibration JCO process ellipticity

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Effects of RNA interference targeting angiotensin 1a receptor on blood pressure and cardiac hypertrophy of rats with renovascular hypertension

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Frontiers of Medicine 2008年第1期2卷 19-24页

作者： Jingqun ZHANG honglei sun Yexin MA Daowen WANG Department of Cardiology Tongji HospitalTongji Medical College of Huazhong University of Science and TechnologyWuhan 430030China

The aim of this study is to investigate the effects of RNA interference(RNAi)targeting angiotensin 1a receptor(AT1a)on blood pressure and cardiac hypertrophy of rats with renovascular *** RNAi plasmids,pAT1a-shRNA1 and pAT1ashRNA2 each carrying a U6 promoter and an AT1aspecific shRNA-coding template sequence corresponding to the sites 928-946,978-996 of the mRNA transcript,and a control plasmid pCon carrying a nonspecific shRNA-coding sequence were *** Sprague-Dawley rats with renovascular hypertension(2-kidney 1-clip)were randomly divided into 5 equal groups:Control group(without any intervention),pAT1a-shRNA1,pAT1a-shRNA2,pCon groups(with injection of the corresponding plasmid 4 mg/kg respectively into the tail vein),and valsartan group(30 mg/kg·d^(-1) by gavage).Three weeks after drug administration,pAT1a-shRNA1,pAT1a-shRNA2 and valsartan respectively resulted in decrease of the tail blood pressure by(15.1±5.4),(16.4±8.4)and(30.6±18.2)***,the tail blood pressure increased further by about 25 mmHg in both of pCon and control *** carotid artery pressures of pAT1a-shRNA1,pAT1ashRNA2 and valsartan groups were all significantly lower than those of the control and pCon *** ratio of left ventricle weight to body weight(LV/BW)of the rats in pAT1a-shRNA1,pAT1a-shRNA2,and valsartan groups decreased significantly than in the control group(P0.05).Histopathological examination showed that the myocardiocytes were significantly hypertrophic and the basal membrane of the aorta was significantly thickened in the control group and such changes were alleviated in the pAT1a-shRNA1,pAT1a-shRNA2 and valsartan *** with the control group,pAT1a-shRNA1 and pAT1a-shRNA2 groups had lowered expression of AT1 receptor(in the myocardium and the thoracic aorta(all P<0.01);however,there were no significant differences in expression levels of AT1 receptor in valsartan and the control gro

关键词： receptor,angiotensin,type 1 hypertension,renovascular RNA interference

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Prussian Blue Analogue Derived N-Doped Graphitic Carbon Wrapped Iron-Cobalt Nanoparticles as Recyclable Heterogeneous Catalysts for Friedel-Crafts Acylation

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Chemical Research in Chinese Universities 2024年第6期40卷 1116-1126页

作者： LEI Zhenyu sun honglei DONG Zhehan sun Shuaishuai BI Chongyao ZHAN Junling WU Lin JIA Mingjun JIA Mingjun jiamj@*** Department of Physical Chemistry College of ChemistryJilin UniversityChangchun 130012P.R.China

The rational design of efficient heterogeneous catalysts for Friedel-Crafts acylation reactions is highly desirable for meeting the need for the industrial production of various aromatic ketone compounds and biomass-derived ***,we reported that graphitic carbon wrapped FeCo bimetallic nanoparticles confined in nitrogen-doped carbon nanotubes,which were prepared by pyrolysis of FeCo-based Prussian blue analogue and melamine via a two-stage programmed heating procedure,exhibited excellent catalytic activity and recyclability for the acylation of aromatic compounds with acyl *** oxidized bimetallic species embedded in the external graphitic carbon shell should be the main active sites for the acylation *** graphitic carbon shell and the carbon nanotube could provide effective protection on the active metal species against leaching through multiple interactions,leading to the formation of a highly active and durable heterogeneous catalyst for the acylation reaction.

关键词： Prussian blue analogue N-Doped carbon material Pyrolysis Bimetallic nanoparticle Friedel-Crafts acylation

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促红细胞生成素干预牙髓损伤后修复性牙本质形成及骨形态发生蛋白2的表达

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中国组织工程研究 2025年第11期29卷 2231-2242页

作者：程瑞卿孙红蕾耿双双王超李军科陈燕芳河北省眼科医院河北省眼科学重点实验室河北省眼部疾病临床医学研究中心河北省邢台市054001

背景:促红细胞生成素具有抗炎、抗凋亡、促进骨缺损修复等作用,目前关于促红细胞生成素对牙髓损伤后修复性牙本质形成及其相关分子机制的研究较少。目的:探究促红细胞生成素对牙髓损伤后修复性牙本质形成的影响。方法:(1)动物实验:采用... 详细信息

背景:促红细胞生成素具有抗炎、抗凋亡、促进骨缺损修复等作用,目前关于促红细胞生成素对牙髓损伤后修复性牙本质形成及其相关分子机制的研究较少。目的:探究促红细胞生成素对牙髓损伤后修复性牙本质形成的影响。方法:(1)动物实验:采用随机数字表法将32只大鼠随机分为对照组(n=16)与实验组(n=16),实验组牙髓损伤处使用含促红细胞生成素的胶原蛋白海绵直接盖髓,对照组露牙髓损伤处使用含PBS的胶原蛋白海绵直接盖髓,用玻璃离子粘固剂封闭窝洞;治疗2,4周后取上颌骨,采用免疫组化染色检测巢蛋白在牙本质中的表达,苏木精-伊红染色观察修复性牙本质生成。取4只SD大鼠上颌骨,免疫组化染色检测磨牙与切牙中促红细胞生成素表达。(2)细胞实验:从人牙髓组织、牙周韧带组织及牙龈组织中分别分离获取人牙髓细胞、人牙周韧带细胞和人牙龈成纤维细胞,采用RT-PCR检测促红细胞生成素mRNA表达。在成牙本质细胞诱导或未诱导分化条件下,采用RT-PCR检测人牙髓细胞中促红细胞生成素、牙本质涎磷蛋白、牙本质基质蛋白1、巢蛋白m RNA表达。在成牙本质细胞诱导或未诱导分化条件下,下调促红细胞生成素表达或外源性给予促红细胞生成素干预后,采用RT-PCR检测人牙髓细胞牙本质涎磷蛋白、牙本质基质蛋白1 mRNA相对表达,茜素红S染色检测矿化结节形成,RT-PCR与Western blotting检测骨形态发生蛋白2 mRNA与蛋白表达。结果与结论:(1)动物实验:与对照组相比,实验组治疗2,4周后的修复性牙本质生成量更大,牙本质中巢蛋白表达更高。促红细胞生成素在大鼠上颌第一磨牙牙髓、成牙本质细胞层和牙周膜中呈弱阳性表达,在成牙本质细胞中呈强阳性表达。(2)细胞实验:与其他两种细胞相比,人牙髓细胞中的促红细胞生成素m RNA表达更高。与未诱导分化相比,成牙本质细胞诱导分化下人牙髓细胞中牙本质涎磷蛋白、牙本质基质蛋白1、巢蛋白、促红细胞生成素与骨形态发生蛋白2 mRNA表达升高,矿化结节生成增加。在成牙本质细胞诱导分化下,下调促红细胞生成素表达后人牙髓细胞中牙本质涎磷蛋白、牙本质基质蛋白1、巢蛋白、骨形态发生蛋白2 mRNA表达与矿化结节生成均降低,骨形态发生蛋白2蛋白表达降低;外源性给予促红细胞生成素干预后,人牙髓细胞中上述指标表达均升高。(3)结果表明:促红细胞生成素对牙本质形成具有一定的促进作用。

关键词：促红细胞生成素牙髓损伤修复性牙本质直接盖髓成牙本质细胞人牙髓细胞

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