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A coupled elasto-plastic-damage mechanical model for marble

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Science china(Technological Sciences) 2011年第S1期54卷 228-234页

作者： zhou Hui 1,ZHANG Kai 2 & FENG XiaTing 1 1 state key laboratory of geomechanics and geotechnical engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,wuhan 430071,china 2 state key laboratory for geomechanics and Deep Underground engineering,china University of Mining&Technology,Xuzhou 221008,china state key laboratory of geomechanics and geotechnical engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan China state key laboratory for geomechanics and Deep Underground engineering China University of Mining & Technology Xuzhou China

A profound understanding of the mechanical behaviors of marble is very important for the design and construction of deep diversion tunnels in Jinping II hydropower *** this paper,a coupled elasto-plastic-damage mechanical model is presented for Jinping ***,the experimental investigations on Jinping marble are ***,based on the framework of continuum damage and plastic theories,a general mechanical model is proposed to predict the mechanical responses of Jinping *** proposed model is used to simulate the triaxial compressive tests,and there is a general good agreement between experimental data and numerical predictions in a qualitative *** proposed model is able to capture the main features of Jinping marble observed in experiments,such as progressive yielding process,damage induced by plastic distortion,dilation,elastic degradation and stress sensitivity.

关键词： mechanical model damage elasto-plastic coupling marble

MESHLESS METHOD OF DUAL RECIPROCITY HYBRID RADIAL BOUNDARY NODE METHOD FOR ELASTICITY

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Acta Mechanica Solida Sinica 2010年第5期23卷 447-458页

作者： Fei Yan Xiating Feng Hui zhou 1(state key laboratory of geomechanics and geotechnical engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Science,wuhan 430071,china) state key laboratory of geomechanics and geotechnical engineering Institute of Rock and Soil Mechanics Chinese Academy of Science Wuhan China

Combining the radial point interpolation method （RPIM）, the dual reciprocity method （DRM） and the hybrid boundary node method （HBNM）, a dual reciprocity hybrid radial boundary node method （DHRBNM） is proposed for linear elasticity. Compared to DHBNM, RPIM is exploited to replace the moving least square （MLS） in DHRBNM, and it gets rid of the deficiency of MLS approximation, in which shape functions lack the delta function property, the boundary condition can not be applied easily and directly and it＇s computational expense is high. Besides, different approximate functions are discussed in DRM to get the interpolation property, in which the accuracy and efficiency for different basis functions are compared. Then RPIM is also applied in DRM to replace the conical function interpolation, which can greatly improve the accuracy of the present method. To demonstrate the effectiveness of the present method, DHBNM is applied for comparison, and some numerical examples of 2-D elasticity problems show that the present method is much more effective than DHBNM.

关键词： meshless method hybrid boundary node method dual reciprocity method radial point interpolation method elasticity

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干湿路径影响粉土小应变剪切模量的试验研究

岩土力学 2015年第S1期36卷 377-381页

作者：徐洁周超河海大学岩土力学与堤坝工程教育部重点实验室江苏南京210098 河海大学岩土工程研究所江苏南京210098 香港科技大学土木与环境工程学系

天然土尤其是地表浅层土常处于非饱和状态,其小应变剪切模量是预测地基变形及土工结构物动力反应的一个重要参数。通过对非饱和压实粉土三轴样进行弯曲元试验,研究了吸力和干湿路径对其小应变剪切模量的影响。试验结果表明,非饱和压实... 详细信息

天然土尤其是地表浅层土常处于非饱和状态,其小应变剪切模量是预测地基变形及土工结构物动力反应的一个重要参数。通过对非饱和压实粉土三轴样进行弯曲元试验,研究了吸力和干湿路径对其小应变剪切模量的影响。试验结果表明,非饱和压实粉土样的小应变剪切模量各向异性忽略不计;小应变剪切模量G0(vh)、G0(hh)和G0(hv)均随吸力增大而非线性增大;同一吸力下不同干湿路径上的土样,饱和度不同,其小应变剪切模量随饱和度升高而减小,主要原因是土的平均骨架应力和土中毛细水的作用。根据试验结果对非饱和土小应变剪切模量的半经验公式进行了改进,同时考虑了吸力与饱和度的作用。

关键词：非饱和土小应变剪切模量弯曲元干湿路径吸力饱和度

Characterization of transient groundwater flow through a high arch dam foundation during reservoir impounding

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Journal of Rock Mechanics and geotechnical engineering 2016年第4期8卷 462-471页

作者： Yifeng Chen Jiamin hong Shaolong Tang chuangbing zhou state key laboratory of Water Resources and Hydropower engineering Science Wuhan UniversityWuhan 430072 China School of Civil engineering and Architecture Nanchang University Nanchang 330031 China

Numerous deep underground projects have been designed and constructed in china, which are beyond the current specifications in terms of scale and construction difficulty. The severe failure problems induced by high in situ stress, such as rockburst, spalling, damage of deep surrounding rocks, and timedependent damage, were observed during construction of these projects. To address these problems, the dynamic design method for deep hard rock tunnels is proposed based on the disintegration process of surrounding rocks using associated dynamic control theories and technologies. Seven steps are basically employed：（i） determination of design objective,（ii） characteristics of site, rock mass and project, and identification of constraint conditions,（iii） selection or development of global design strategy,（iv）determination of modeling method and software,（v） preliminary design,（vi） comprehensive integrated method and dynamic feedback analysis, and（vii） final design. This dynamic method was applied to the construction of the headrace tunnels at Jinping II hydropower station. The key technical issues encountered during the construction of deep hard rock tunnels, such as in situ stress distribution along the tunnels, mechanical properties and constitutive model of deep hard rocks, determination of mechanical parameters of surrounding rocks, stability evaluation of surrounding rocks, and optimization design of rock support and lining, have been adequately addressed. The proposed method and its application can provide guidance for deep underground projects characterized with similar geological conditions.

关键词： Deep hard rock tunnels Dynamic design method Rockburst In situ stress Constitutive model

Integrated approach of predicting rock stability in high mountain valley underground caverns

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Underground Space 2024年第6期19卷 317-341页

作者： Fuyuan Tan Haosen Guo Pengzhi Pan Zhaofeng Wang Xufeng Liu Yangyi zhou East china Jiaotong University Nanchang 467200China state key laboratory of geomechanics and geotechnical engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China key laboratory of Liaoning Province on Deep engineering and Intelligent Technology Northeastern UniversityShenyang 110819China University of Chinese Academy of Sciences Beijing 100049China

High mountain valleys are characterized by the development of intricate ground stress fields due to geological processes such as tectonic stress,river erosion,and rock *** processes introduce considerable stability concerns in the surrounding rock formations for underground engineering projects in these regions,highlighting the imperative need for rigorous stability assessments during the design phase to ensure construction *** paper introduces an innovative approach for the pre-evaluation of the stability of surrounding rocks in underground caverns situated within high mountain *** methodology comprises several pivotal ***,we conduct inverse calculations of the ground stress field in complex geological terrains,combining field monitoring and numerical ***,we ascertain stress-strength ratios of the surrounding rocks using various rock strength *** assess the stability characteristics of the surrounding rocks in the 1^(#)spillway cave within our project area,we employ numerical simulations to compute stress-strength ratios based on different rock strength ***,we undertake a comparative analysis,utilizing data from the 5^(#)Underground laboratory(Lab 5)of Jinping II Hydropower Station,aligning the chosen rock strength criterion with the damage characteristics of Lab 50s surrounding *** analysis serves as the cornerstone for evaluating other mechanical responses of the surrounding rocks,thereby validating the pre-evaluation *** pre-evaluation method takes into account the intricate geological evolution processes specific to high mountain *** also considers the influence of the initial geostress field within the geological range of underground *** comprehensive approach provides a robust foundation for the analysis and assessment of the stability of surrounding rocks,especially in high mountain valley areas,during the design phase of underground engi

关键词： High mountain valley Underground cavern Stability of surrounding rock On-site monitoring Stress-strength ratio Numerical simulation

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粉煤灰-煤矸石充填技术的科学知识图谱分析

应用化工 2024年第9期53卷 2237-2242页

作者：周洪王翰文张力为魏凤中国科学院武汉文献情报中心湖北武汉430071 科技大数据湖北省重点实验室湖北武汉430071 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室湖北武汉430071 中国科学院大学北京100049

基于相关论文和专利,分析了该领域的研发态势和主要国家、研究机构及其研发重点的分布特征,并在此基础上开展主题分析,梳理了研究方向、主题和发展趋势。结果表明,目前该领域的研究论文产出呈现波动增长趋势,相关专利数量则呈现上涨趋势... 详细信息

基于相关论文和专利,分析了该领域的研发态势和主要国家、研究机构及其研发重点的分布特征,并在此基础上开展主题分析,梳理了研究方向、主题和发展趋势。结果表明,目前该领域的研究论文产出呈现波动增长趋势,相关专利数量则呈现上涨趋势,我国是目前开展相关技术研发最多的国家,主要涉及流变学、抗压强度、机械性能以及充填工艺等方面。提出了粉煤灰-煤矸石充填技术研发的前沿动态、技术路线、研企合作、政策标准等建议,以期为相关领域决策和研究提供科学依据。

关键词：粉煤灰煤矸石充填技术科学知识图谱专利分析

A local homogenization approach for simulating the reinforcement effect of the fully grouted bolt in deep underground openings

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International Journal of Mining Science and Technology 2022年第2期32卷 247-259页

作者： Dingping Xu Xiuyang Liu Quan Jiang Shaojun Li Yangyi zhou Shili Qiu Fei Yan hong zheng Xiang Huang state key laboratory of geomechanics and geotechnical engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China University of Chinese Academy of Sciences Beijing 100049China key laboratory of Ministry of Education on Safe Mining of Deep Metal Mines Northeastern UniversityShenyang 110819China

Fully grouted bolts are a key component of the support system for underground *** considerable effort has been made in the simulation of the reinforcement effect of the fully grouted bolts on the rock masses surrounding underground openings,most of the work has limited significance since the structural element approach is *** study proposes a local homogenization approach(L-H approach)that integrates elastoplastic mechanics,composite mechanics,and analytical approaches with numerical simulation to effectively simulate the reinforcement effect of the fully grouted bolt on deep surrounding rock *** the L-H approach,the representative volume of bolted rock mass(RVBRM)with a fully grouted bolt is established based on the original mesh model utilized in the rockbolt element *** RVBRM is a regular quadrangular prism with a cross-sectional size equal to the bolt spacing and a length equal to the bolt *** RVBRM is homogenized by the L-H approach from a unidirectional bolt-reinforced composite into a homogeneous transversely isotropic medium whose mechanical properties are described by a new transversely isotropic elastoplastic *** L-H parameters for the RVBRM are obtained using analytical approaches,composite mechanics,and known parameters of the rock mass and *** the L-H approach,the reinforcement effect of the fully grouted bolt on the bolted rock specimen and the surrounding rock mass in Jinping II Diversion Tunnel#2 with a depth greater than 2000 m is *** results show that the predictions of the L-H approach are more in agreement with the physical model results of bolted rock specimen and provide a more realistic response of the bolted surrounding rock *** L-H approach demonstrates that fully grouted bolts with common bolt spacings and diameters substantially enhance the elastic modulus,shear strength,and tensile strength of the rock mass in the direction of the bolt axis.

关键词： Fully grouted bolt Reinforcement effect Representative volume Transverse isotropy Homogenization

聚醚胺-230处治膨胀土的膨胀-压缩-收缩试验

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中国公路学报 2024年第6期37卷 111-121页

作者：邱煜卢正颜廷舟李剑丁新胜胡海翔姚海林中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室湖北武汉430071 中国科学院大学北京100049 环境岩土工程湖北省重点实验室湖北武汉430071 湖北省交通规划设计院股份有限公司湖北武汉430051 中能建葛洲坝轨道交通建设有限公司广东深圳518116

基于高效、快速、大面积处治膨胀土的工程需求,以聚醚胺-230作为水溶性膨胀土稳定剂并成功实现对膨胀土的快速处治。模拟常规路基施工中配制含水率后的压实填筑方法,讨论聚醚胺水溶液代替水按照掺入配比的方法处治膨胀土的效果与土壤特... 详细信息

基于高效、快速、大面积处治膨胀土的工程需求,以聚醚胺-230作为水溶性膨胀土稳定剂并成功实现对膨胀土的快速处治。模拟常规路基施工中配制含水率后的压实填筑方法,讨论聚醚胺水溶液代替水按照掺入配比的方法处治膨胀土的效果与土壤特性变化。通过膨胀、固结与收缩试验比较了膨胀土与不同聚醚胺-膨胀土质量比对应处治土的膨胀、压缩与收缩特性。结果表明:聚醚胺的迅速吸附能抑制并调控膨胀土的膨胀与收缩劣害性,同时使压实处治土展现出土壤结构的强化特性。处治土的膨胀、压缩和收缩指标均显著降低;样品制备为干密度1.62 g·cm^(-3)时,膨胀土可被处治为低膨胀性、低收缩性、中压缩性的处治土。基于吸附机理,聚醚胺的掺入量主要影响着处治效果,但存在处治极限即无法完全抑制膨胀与收缩特性。主要处治机理通过对扫描电子显微镜图像与膨胀土中黏粒部分的X-衍射分析进行表征,干燥的提取黏粒中蒙皂石层间距1.49 nm变化为处治后的1.36 nm,可解释为聚醚胺的插层效应导致蒙皂石矿物层间的离子水化受到抑制。聚醚胺单层平铺吸附于蒙皂石矿物层间,层间钙离子无法水化至2层水分子以上扩大层间距。土壤颗粒表面水敏性显著降低,土壤微观结构图像直观地揭示了聚醚胺在膨胀土中的吸附导致的水化抑制与土壤结构强化效应。

关键词：路基工程膨胀土试验研究稳定剂膨胀压缩收缩聚醚胺-230

Numerical modeling of coupled thermo-mechanical response of a rock pillar

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Journal of Rock Mechanics and geotechnical engineering 2010年第3期2卷 262-273页

作者： Yifeng Chen chuangbing zhou Lanru Jing state key laboratory of Water Resources and Hydropower engineering Science Wuhan UniversityWuhan430072China key laboratory of Rock Mechanics in Hydraulic Structural engineering of Ministry of Education Wuhan UniversityWuhan430072China Department of Land and Water Resources engineering Royal Institute of TechnologyStockholm SE-100 44Sweden

Understanding the rock mass response to excavation and thermal loading and improving the capability of the numerical models for simulating the progressive failure process of brittle rocks are important for safety assessment and optimization design of nuclear waste *** international cooperative DECOVALEX-2011 project provides a platform for development,validation and comparison of numerical models,in which the sp pillar stability experiment（APSE） was selected as the modeling target for Task *** paper presents the modeling results of wuhan University（WHU） team for stages 1 and 2 of Task B by using a coupled thermo-mechanical model within the framework of continuum *** rock mass response to excavation is modeled with linear elastic,elastoplastic and brittle-plastic models,while the response to heating is modeled with a coupled thermo-elastic *** capabilities and limitations of the model for representation of the thermo-mechanical responses of the rock pillar are discussed by comparing the modeling results with experimental *** results may provide a helpful reference for the stability and safety assessment of the hard granite host rock in china＇s Beishan preselected area for high-level radioactive waste disposal.

关键词： thermo-mechanical coupling sp pillar stability experiment(ASPE) numerical modeling DECOVALEX-2011 project