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Mechanical behaviour of fiber-reinforced grout in rock bolt reinforcement

Journal of Rock Mechanics and Geotechnical Engineering 2024年第2期16卷 437-453页

作者： Yingchun li Ammar Ahmed danqi li Deep Underground Engineering Research Center Dalian University of TechnologyDalian116024China WA School of Mines:Minerals Energy and Chemical Engineering Curtin UniversityKalgoorlieWA6430Australia

Grouted rock bolts subject to axial loading in the field exhibit various failure modes,among which the most predominant one is the bolt-grout interface ***,mechanical characterization of the grout is essential for understanding its performance in ground *** date,few studies have been conducted to characterize the mechanical behaviour of fiber-reinforced grout(FRG)in rock bolt *** we experimentally studied the mechanical behaviour of FRG under uniaxial compression,indirect tension,and direct shear loading *** also conducted a series of pullout tests of rebar bolt encapsulated with different grouts including conventional cementitious grout and *** was developed using 15%silica fume(SF)replacement of cement(by weight)and steel fiber to achieve highstrength and crack-resistance to overcome drawbacks of the conventional *** types of steel fibers including straight and wavy steel fibers were further added to enhance the grout *** effect of fiber shape and fiber volume proportion on the grout mechanical properties were *** experimental results showed that the addition of SF and steel fiber by 1.5%fiber volume proportion could lead to the highest compressive,tensile,and shear strengths of the *** minimum volume of fiber that could improve the mechanical properties of grout was found at 0.5%.The scanning electron microscopy(SEM)analysis demonstrated that steel fibers act as an excellent bridge to prevent the cracks from propagating at the interfacial region and hence to aid in maintaining the integrity of the cementitious *** laboratory pullout tests further confirmed that FRG could prevent the cylindrical grout annulus from radial crack and hence improve the rebar’s load carrying ***,FRG has a potential to be utilized in civil and mining applications where high-strength and crack-resistance support is required.

关键词： Fiber-reinforced grout(FRG) Steel fibers Mechanical properties Direct shear test Pullout test

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意识形态视域下人类命运共同体意识培育研究

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思想教育研究 2024年第4期 61-66页

作者：李丹琪四川大学马克思主义学院四川成都610200

党的十八大以来,习近平多次提出构建人类命运共同体理念,这一理念受到国际社会的高度关注和积极回应。推动构建人类命运共同体,需要加强人类命运共同体意识培育。人类命运共同体意识既具有宽广的国际视野,也具有鲜明的中国特色。从内在... 详细信息

党的十八大以来,习近平多次提出构建人类命运共同体理念,这一理念受到国际社会的高度关注和积极回应。推动构建人类命运共同体,需要加强人类命运共同体意识培育。人类命运共同体意识既具有宽广的国际视野,也具有鲜明的中国特色。从内在结构来看,人类命运共同体意识包含着价值共识体系、话语表达体系、制度保障体系和行动传播体系。人类命运共同体意识培育的主要内容包括全人类共同价值教育、多元文化理解教育、世情国情教育和社会思潮引导教育。为加强人类命运共同体意识培育,可以从理论研究、教育引导、制度构建和实践养成等方面协同发力,提高培育实效。

关键词：意识形态人类命运共同体培育路径

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植物提取物对动物腹泻致病菌的抑菌作用及机制研究进展

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动物营养学报 2024年第3期36卷 1515-1524页

作者：李瑜瑶高品一李丹琦刘学贵沈阳化工大学功能分子研究所沈阳110142 沈阳化工大学制药与生物工程学院沈阳110142 辽宁省绿色功能分子设计与开发重点实验室沈阳110142 沈阳化工大学硼镁资源开发与精细化工技术国家地方联合工程实验室沈阳110142

植物提取物中多种生物活性物质可抑制畜禽肠道腹泻致病菌,作为饲料添加剂已广泛应用于畜禽生产过程中。本文综述了近年来国内外学者有关植物提取物的来源、抑菌活性和作用机制及其对畜禽细菌性腹泻疾病的治疗和预防机制的研究进展,以期... 详细信息

植物提取物中多种生物活性物质可抑制畜禽肠道腹泻致病菌,作为饲料添加剂已广泛应用于畜禽生产过程中。本文综述了近年来国内外学者有关植物提取物的来源、抑菌活性和作用机制及其对畜禽细菌性腹泻疾病的治疗和预防机制的研究进展,以期为植物提取物防治畜禽腹泻病提供参考。

关键词：植物提取物腹泻致病菌抑菌活性成分抑菌机制

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预防性护理对CT增强扫描患者碘造影剂致不良反应的影响

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智慧健康 2024年第8期10卷 237-239页

作者：李丹琦常熟市中医院/常熟市新区医院江苏常熟215500

目的预防性护理对CT增强扫描患者碘造影剂致不良反应的影响。方法选取2022年6—12月在本院进行CT增强扫描的173例患者为研究对象,采取随机分组的模式,将其分为对照组与观察组,对照组采用常规护理,观察组在对照组的基础上采用预防性护理... 详细信息

目的预防性护理对CT增强扫描患者碘造影剂致不良反应的影响。方法选取2022年6—12月在本院进行CT增强扫描的173例患者为研究对象,采取随机分组的模式,将其分为对照组与观察组,对照组采用常规护理,观察组在对照组的基础上采用预防性护理。观察两组患者在检查满意度和不良反应发生率的情况。结果对比两组患者在检查满意度(服务态度、沟通技巧、舒适性、护理质量),观察组得分显著高于对照组,组间差异有统计学意义(P<0.05);观察组患者发生不良反应发生率显著低于对照组,组间差异有统计学意义(P<0.05)。结论常规护理联合预防性护理干预可以有效地改善患者的检查结果,提高检查满意度,降低患者的不良反应发生率,值得在临床上推广应用。

关键词：预防性护理 CT增强扫描碘造影剂舒适度不良反应

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伊斯特林悖论、精神生活水平与农民幸福感提升研究--基于CGSS2021数据的实证分析

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绵阳师范学院学报 2024年第4期43卷 1-12,20页

作者：纪志耿李丹琪四川大学马克思主义学院四川成都610200

人民对美好生活的向往,就是我们的奋斗目标。但人民幸福感的增强并不仅仅与物质生活水平相适应,还与精神生活水平存在密切联系。伊斯特林悖论虽然揭示了更多的财富不一定会带来更大幸福的事实,但对其产生原因的解释不够全面,明显忽略了... 详细信息

人民对美好生活的向往,就是我们的奋斗目标。但人民幸福感的增强并不仅仅与物质生活水平相适应,还与精神生活水平存在密切联系。伊斯特林悖论虽然揭示了更多的财富不一定会带来更大幸福的事实,但对其产生原因的解释不够全面,明显忽略了情感状态、精神追求、信仰、个人价值观等精神生活方面的因素。通过运用实证研究方法,从精神生活水平出发,利用中国社会状况综合调查(CGSS)的原始数据,构建农民的精神生活水平评价体系,可以发现精神生活水平与农民的幸福感呈显著正向相关,且在不同收入组、地区、性别、年龄的农民幸福感的组合样态下存在较大差异。在全面推进乡村振兴过程中,要多措并举丰富农民的精神文化生活,多管齐下缩小农民收入水平差距,多方协作加强地区、年龄和性别差异研究,切实提高广大农民的获得感、幸福感、安全感,实现物质生活与精神生活共同富裕。

关键词：伊斯特林悖论农民精神生活水平幸福感

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Microcrack fracturing of coal specimens under quasi-static combined compression-shear loading

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Journal of Rock Mechanics and Geotechnical Engineering 2020年第5期12卷 1014-1026页

作者： Qingyuan He Yingchun li danqi li Chengguo Zhang State Key Laboratory of Coal Resources and Safe Mining School of MinesChina University of Mining and TechnologyXuzhou221116China School of Minerals and Energy Resources Engineering University of New South WalesSydney2052Australia State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian116024China Department of Civil Engineering Monash UniversityClaytonMelbourneVIC3800Australia

Coal pillars are usually loaded under combined compression-shear stresses at underground coal *** long-term stability is critical to the utilization of underground structures,such as underground reservoirs at coal *** this study,a modified rock property testing system was used to explore the mechanical properties of coal specimens under quasi-static combined compression-shear loading *** acoustic emission technique was applied to investigating the microcrack fracturing of coal specimens at various inclination *** experimental results show that specimen inclination has remarkable effects on the microcrack initiation,microcrack damage and ultimate failure of the coal *** failure mode of the coal specimen tends to transit from axial splitting to shear failure with increasing specimen inclination,and its peak strength is closely associated with the microcrack damage *** practice,it is recommended to consider coal strength under combined compression-shear loading when using empirical pillar strength formulae so that the effect of pillar inclination can be included.

关键词： Microcrack initiation(CI) Microcrack damage(CD) Microcrack fracturing Acoustic emission Coal properties

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Borehole deformation based in situ stress estimation using televiewer data

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第9期15卷 2475-2481页

作者： Hamid Roshan danqi li Ismet Canbulat Klaus Regenauer-lieb School of Minerals and Energy Resources Engineering University of New South WalesSydneyNSW2052Australia WA School of Mines MineralsEnergy and Chemical EngineeringCurtin UniversityPerthWA6102Australia

The knowledge of in situ stress is critical in safe and optimised extraction of minerals and energy *** situ stresses are either measured directly(***)or estimated indirectly(*** breakouts).Borehole breakout analysis for in situ stress estimation is considered a relatively simple and cost-efficient *** technique,however,poses certain limitations such as complexities with progressive formation of breakouts and it requires inputs such as rock failure parameters that are not often *** a result,significant effort has been made to develop new indirect methods for in situ stress *** deformation analysis using four-arm caliper has been recently proposed for in situ stress estimation and has shown promising *** this study,we demonstrate a new methodology that analyses the borehole televiewer data with the technique of borehole deformation analysis to estimate the in situ stresses through a field case *** advantages and challenges of using borehole televiewer data for stress estimation based on borehole deformation analysis are discussed and the best practice to obtain the reliable results is *** limitations of using fourarm caliper and borehole deformation analysis for in situ stress estimation are also discussed and it is shown how televiewer data can overcome such ***,the in situ stress results obtained from televiewer data and borehole deformation analysis are compared with independent in situ stress measurements to show the robustness and reliability of the proposed methodology.

关键词： In situ stress Borehole deformation Televiewer Elastic properties Downhole logging

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苜蓿、山楂叶复配物对油酸诱导HepG2细胞脂肪堆积的影响及其抗氧化活性

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饲料工业 2024年第18期45卷 100-105页

作者：尼鹏博王瑶瑶李丹琦高品一刘学贵沈阳化工大学制药与生物工程学院辽宁沈阳110142 沈阳化工大学功能分子研究所辽宁沈阳110142 辽宁省绿色功能分子设计与开发重点实验室辽宁沈阳110142 硼镁资源开发与精细化工技术国家地方联合工程实验室辽宁沈阳110142

研究旨在探究紫花苜蓿水提物与山楂叶水提物复配对HepG2细胞脂肪堆积的影响及其抗氧化活性。以油酸体外诱导HepG2细胞建立脂肪堆积模型,并分别以紫花苜蓿提取物、山楂叶提取物、紫花苜蓿提取物-山楂叶提取物复配进行干预,采用MTT法测定... 详细信息

研究旨在探究紫花苜蓿水提物与山楂叶水提物复配对HepG2细胞脂肪堆积的影响及其抗氧化活性。以油酸体外诱导HepG2细胞建立脂肪堆积模型,并分别以紫花苜蓿提取物、山楂叶提取物、紫花苜蓿提取物-山楂叶提取物复配进行干预,采用MTT法测定细胞活力;油红O染色法观察脂滴分布;生物试剂盒测定细胞内三酰甘油(TG)、总胆固醇(TC)、丙二醛(MDA)含量,超氧化物歧化酶(SOD)、谷胱甘肽过氧化物酶(GSH-Px)活性及总抗氧化能力(T-AOC)。结果显示,紫花苜蓿提取物-山楂叶提取物复配(6∶4)复配可减少油酸诱导HepG2细胞所导致的脂滴数量增加,降低细胞中TG、TC含量。并增强抗氧化能力,可提高细胞内SOD、GSH-Px酶活性和总抗氧化能力(P<0.01),减少MDA的产生(P<0.05)。综上可得出结论,紫花苜蓿提取物-山楂叶提取物复配可显著抑制油酸诱导HepG2脂肪堆积,其作用优于紫花苜蓿提取物或山楂叶提取物单体,并可提高细胞内源性抗氧化能力。

关键词：紫花苜蓿提取物山楂叶提取物复配脂质堆积抗氧化

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Enhancing sensitivity of SERRS nanoprobes by modifying heptamethine cyanine-based reporter molecules

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Journal of Innovative Optical Health Sciences 2016年第4期9卷 85-93页

作者： Yunfei Zhang danqi li Xingyu Zhou Xihui Gao Shengyuan Zhao Cong li Key Laboratory of Smart Drug Delivery Ministry of Education&PLA School of Pharmacy Fudan University826 Zhangheng Rd.Shanghai201203P.R.China First Clinical College of Tongji Medical College Huazhong University of Science and Technology 13 Hangkong Rd. WuhanHubei430030P.R.China

Surface enhanced resonance Raman scattering(SERRS)is a physical phenomenon that occurs when the energy of incident light is dose to that of electronic excitation of reporter molecules(RMs)attached on *** has showed great promise in healthcare applications such as tumor diagnosis,image guided tumor surgery and real-time evaluation of therapeutic response due to its ultra-sensitivity,manipulating convenience and easy *** the most widely used organic near-infrared(NIR)fuorophore,heptamethine cyanines possess the electronic ex-citation energy that is close to the plasmon absorption energy of the gold nano scafolds,which results in the extraordinary enhancement of the SERRS ***,the effect of hepta-methine cyanine structure and the gold nanoparticle morphology to the SERRS intensity are barely *** work developed a series of SERRS nanoprobes in which two hepta-methine cyanine derivatives(IR783 and IR780)were used as the RM and three gold nanoparticles(nanorod,nanosphere and nanostar)were used as the ***,even though IR780 and IR783 possess very similar chemical structure,SERRS signal produced by IR780 was determined as 14 times higher than that of IR783 when the RM concentration was6.5 × 10^(-6) *** contrast,less than 4.0 fold SERRS signal intensity increase was measured by changing the substrate *** experimental results indicate that finely tuning the chemical structure of the heptamethine cyanine could be a feasible way to develop robust SERRS probes to visualize tumor or guide tumor resection with high sensitivity and target to background ratio.

关键词： Surface enhanced resonance Raman scattering gold nanoparticles reporter molecules heptamethine cyanine.

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Experimental and numerical studies on progressive debonding of grouted rock bolts

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International Journal of Mining Science and Technology 2022年第1期32卷 63-74页

作者： Hao Shi Lei Song Houquan Zhang Wenlong Chen Huasheng lin danqi li Guozhu Wang Huayun Zhao State Key Laboratory for Geomechanics&Deep Underground Engineering School of Mechanics&Civil EngineeringChina University of Mining and TechnologyXuzhou 221116China School of Civil Engineering and Architecture Anhui University of Science and TechnologyHuainan 232001China School of Water Energy and EnvironmentCranfield UniversityCranfield MK430ALUK Glencore Coal Assets Australia Mount ThorleyNSW 2330Australia WA School of Mines:Minerals Energy and Chemical EngineeringCurtin UniversityKalgoorlie WA6430Australia

Understanding the mechanism of progressive debonding of bolts is of great significance for underground *** this paper,both laboratory experiment and numerical simulation of the pull-out tests were *** experimental pull-out test specimens were prepared using cement mortar material,and a relationship between the pull-out strength of the bolt and the uniaxial compressive strength(UCS)of cement mortar material specimen was *** locations of crack developed in the pull-out process were identified using the acoustic emission(AE)*** pull-out test was reproduced using 2D Particle Flow Code(PFC^(2D))with calibrated *** experimental results show that the axial displacement of the cement mortar material at the peak load during the test was approximately 5 mm for cement-based grout of all *** contrast,the peak load of the bolt increased with the UCS of the confining *** peak load,cracks propagated to less than one half of the anchorage length,indicating a lag between crack propagation and axial bolt load *** simulation results show that the dilatation between the bolt and the rock induced cracks and extended the force field along the anchorage direction;and,it was identified as the major contributing factor for the pull-out failure of rock bolt.

关键词： Bolt pull-out test Bolt failure process AE positioning Meso-interaction PFC2D simulation

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