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A particle-resolved heat-particle-fluid coupling model by DEM-IMB-LBM

Journal of Rock Mechanics and Geotechnical engineering 2024年第6期16卷 2267-2281页

作者： Ming Xia Jinlong Fu Y.T.Feng Fengqiang Gong Jin Yu Hunan Key Laboratory of Geomechanics and engineering Safety Xiangtan UniversityXiangtan411105China Zienkiewicz Institute for Modelling Data and AISwansea UniversitySwanseaSA18EPUK School of Civil engineering Southeast UniversityNanjing211189China fujian research center for Tunneling and urban underground space engineering Huaqiao UniversityXiamen361021China

Multifield coupling is frequently encountered and also an active area of research in geotechnical *** this work,a particle-resolved direct numerical simulation(PR-DNS)technique is extended to simulate particle-fluid interaction problems involving heat transfer at the grain *** this extended technique,an immersed moving boundary(IMB)scheme is used to couple the discrete element method(DEM)and lattice Boltzmann method(LBM),while a recently proposed Dirichlet-type thermal boundary condition is also adapted to account for heat transfer between fluid phase and solid *** resulting DEM-IBM-LBM model is robust to simulate moving curved boundaries with constant temperature in thermal *** facilitate the understanding and implementation of this coupled model for non-isothermal problems,a complete list is given for the conversion of relevant physical variables to lattice ***,benchmark tests,including a single-particle sedimentation and a two-particle drafting-kissing-tumbling(DKT)simulation with heat transfer,are carried out to validate the accuracy of our coupled *** further investigate the role of heat transfer in particle-laden flows,two multiple-particle problems with heat transfer are *** examples demonstrate that the proposed coupling model is a promising high-resolution approach for simulating the heat-particle-fluid coupling at the grain level.

关键词： Particle-fluid interaction Heat transfer Discrete element method(DEM) Lattice Boltzmann method(LBM) Dirichlet-type thermal boundary Direct numerical simulation

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An MPI parallel DEM-IMB-LBM framework for simulating fluid-solid interaction problems

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Journal of Rock Mechanics and Geotechnical engineering 2024年第6期16卷 2219-2231页

作者： Ming Xia Liuhong Deng Fengqiang Gong Tongming Qu Y.T.Feng Jin Yu Hunan Key Laboratory of Geomechanics and engineering Safety Xiangtan UniversityXiangtan411105China School of Civil engineering Southeast UniversityNanjing211189China Department of Civil and Environmental engineering Hong Kong University of Science and TechnologyHong KongChina Zienkiewicz Centre for Computational engineering Swansea UniversitySwanseaSA18ENUK fujian research center for Tunneling and urban underground space engineering Huaqiao UniversityXiamen361021China

The high-resolution DEM-IMB-LBM model can accurately describe pore-scale fluid-solid interactions,but its potential for use in geotechnical engineering analysis has not been fully unleashed due to its prohibitive computational *** overcome this limitation,a message passing interface(MPI)parallel DEM-IMB-LBM framework is proposed aimed at enhancing computation *** framework utilises a static domain decomposition scheme,with the entire computation domain being decomposed into multiple subdomains according to predefined processors.A detailed parallel strategy is employed for both contact detection and hydrodynamic force *** particular,a particle ID re-numbering scheme is proposed to handle particle transitions across sub-domain *** benchmarks are conducted to validate the accuracy and overall performance of the proposed ***,the framework is applied to simulate scenarios involving multi-particle sedimentation and submarine *** numerical examples effectively demonstrate the robustness and applicability of the MPI parallel DEM-IMB-LBM framework.

关键词： Discrete element method(DEM) Lattice Boltzmann method(LBM) Immersed moving boundary(IMB) Multi-cores parallelization Message passing interface(MPI) CPU Submarine landslides

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Analytical solution for tunnelling-induced response of an overlying pipeline considering gap formation

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underground space 2024年第2期15卷 298-311页

作者： Cungang Lin Junjie Zheng Yiwen Ye Farrokh Nadim Zhongqiang Liu Chenyang Zhao Yu Chen Zhi Ding Guangdong research center for underground space Exploitation Technology School of Civil EngineeringSun Yat-sen UniversityGuangzhou 510275China Guangdong Key Laboratory of Marine Civil engineering School of Civil EngineeringSun Yat-sen UniversityGuangzhou 510275China State Key Laboratory for Tunnel engineering Ministry of EducationGuangzhou 510275China Southern Marine Science and engineering Guangdong Laboratory(Zhuhai) Zhuhai 519082China School of Civil engineering Wuhan UniversityWuhan 430072China Guangdong Road and Bridge Construction Development Co. Ltd.Guangzhou 510660China Norwegian Geotechnical Institute Oslo 0806Norway Key Laboratory of Safe Construction and Intelligent Maintenance for urban Shield Tunnels of Zhejiang Province Hangzhou 310015China

Soil-pipeline separation due to tunnelling has been certainly substantiated in previous model ***,this phenomenon has seldom been considered in current analytical *** study formulates a tensionless Winkler solution that could make allowance for gap formation in soil-pipeline interaction *** solution is validated by comparisons with existing experimental measurements and two recognized analytical ***,its advantage over an existing Winkler solution is *** parametric studies reveal that the effects of gap formation on the response of a pipeline rely largely on the tunnel volume loss and the pipeline’s bending stiffness and burial *** general,a pipeline’s bending moments and subgrade reaction forces are more susceptible than its deflections to the gap formation.

关键词： Soil-pipeline interaction tunnelling Tensionless Winkler model Ground settlement Analytical solution Gap formation

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Ground settlement and tunnel response due to twin-curved shield tunnelling in soft ground with small clear distance

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Journal of Rock Mechanics and Geotechnical engineering 2024年第8期16卷 3122-3135页

作者： Yao Hu Haoran Tang Yinggang Xu Huayang Lei Peng Zeng Kai Yao Yabo Dong State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu610059China research center of Tunneling and underground engineering of Ministry of Education Beijing Jiaotong UniversityBeijing100044China College of Environment and Civil engineering Chengdu University of TechnologyChengdu610059China School of Civil engineering Tianjin UniversityTianjin300350China School of Qilu Transportation Shandong UniversityJinan250002China Power China Sinohydro Bureau 7 Co. Ltd.Chengdu610213China

Twin curved tunnels are often encountered in shield tunnelling,where significant complexities in densely exploited underground space are *** this study,the ground settlement and tunnel deformation due to twin-curved shield tunnelling in soft ground were investigated using numerical simulation and field *** curvature radii of twin curved tunnels and subsequent effects of tunnel construction were considered to reveal the tunnelling effect on ground surface settlement and tunnel *** results show that the settlement trough yields one offset towards inside of curved shield *** location of settlement trough and maximum settlement were affected by curvature radius but except for the shape and width of settlement *** parallel twin-curved shield tunnelling could increase the offset of existing settlement trough and maximum ***,an empirical prediction of surface settlement trough due to twin-curved shield tunnelling with same tunnel diameters in soft clay was proposed,which was applicable to curvature radius less than 800 ***,a minimum radius of 600 m of curvature tunnel was proposed in terms of allowable convergence deformation of *** result could provide guidance on safety evaluation for twin curved shield tunnelling construction.

关键词： Shield tunnelling Curvature radius Ground settlement Tunnel deformation Numerical simulation

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Cyclic constitutive equations of rock with coupled damage induced by compaction and cracking

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International Journal of Mining Science and Technology 2022年第5期32卷 1153-1165页

作者： Chonghong Ren Jin Yu Xueying Liu Zhuqing Zhang Yanyan Cai fujian research center for Tunneling and urban underground space engineering Huaqiao UniversityXiamen 361021China Xiamen Rail Transit Group Corporation Limited Xiamen 361021China

In this paper,the cyclic constitutive equations were proposed to describe the constitutive behavior of cyclic loading and ***,a coupled damage variable was derived,which contains two parts,i.e.,the compaction-induced damage and the cracking-induced *** compaction-induced damage variable was derived from a nonlinear stress–strain relation of the initial compaction stage,and the cracking-induced damage variable was established based on the statistical damage ***,based on the total damage variable,a damage constitutive equation was proposed to describe the constitutive relation of rock under the monotonic uniaxial compression conditions,whereafter,the application of this model is extended to cyclic loading and unloading *** validate the proposed monotonic and cyclic constitutive equations,a series of mechanical tests for marble specimens were carried out,which contained the monotonic uniaxial compression(MUC)experiment,cyclic uniaxial compression experiments under the variable amplitude(CUC-VA)and constant amplitude(CUC-CA)*** results show that the proposed total damage variable comprehensively reflects the damage evolution characteristic,i.e.,the damage variable firstly decreases,then increases no matter under the conditions of MUC,CUC-VA or *** a reasonable consistency is observed between the experimental and theoretical *** proposed cyclic constitutive equations can simulate the whole cyclic loading and unloading behaviors,such as the initial compaction,the strain hardening and the strain ***,the shapes of the theoretical curves are controlled by the modified coefficient,compaction sensitivity coefficient and two Weibull distributed parameters.

关键词： Cyclic constitutive equations Rock Coupled damage Compaction Cracking

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Rapid profiling rock mass quality underneath tunnel face for Sichuan-Xizang Railway

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underground space 2024年第6期19卷 138-152页

作者： Siyuan Wu Min Qiu Zhao Yang Fuquan Ji Zhongqi Quentin Yue Department of Civil engineering The University of Hong KongHong Kong 999077China CCCC Second Harbor engineering Company Ltd. Wuhan 430000China research and Development center of Transport Industry of Intelligent Manufacturing Technologies of Transport Infrastructure Wuhan 430000China

The Sichuan-Xizang Railway is a global challenge,surpassing other known railway projects in terms of geological and topographical *** paper presents an approach for rapidly profiling rock mass quality underneath tunnel face for the ongoing construction of the Sichuan-Xizang *** adopts the time-series method and carries out the quantitative analysis of the rock mass quality using the depth-series measurement-while-drilling(MWD)data associated with drilling of blastholes.A tunnel face with 15 blastholes is examined for *** results include identification of the boundary of homogeneous geomaterial by plotting the blasthole depth against the net drilling time,as well as quantification of rock mass quality through the recalculation of the new specific *** new specific energy profile is compared and highly consistent with laboratory test,manual logging and tunnel seismic prediction *** consistency can enhance the blasthole pattern design and facilitate the dynamic determination of charge placement and *** paper highlights the importance of digital monitoring during blasthole drilling for rapidly profiling rock mass quality underneath and ahead of tunnel *** upgrades the MWD technique for rapid profiling rock mass quality in drilling and blasting tunnels.

关键词： Measurement-while-drilling Drilling and blasting Rock mass quality New specific energy Constant penetration rate Sichuan-Xizang railway tunnelling

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Influence of cutterhead opening ratio on soil arching effect and face stability during tunnelling through non-uniform soils

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underground space 2024年第4期17卷 45-59页

作者： Xue-Jian Chen Pei-Pei Fang Qiu-Nan Chen Jun Hu Kai Yao Yong Liu State Key Laboratory of Water Resources engineering and Management Wuhan UniversityWuhan 430072China Hubei Technology Innovation center for Smart Hydropower Wuhan 430000China College of Civil engineering Anhui Jianzhu UniversityHefei 230601China School of Civil engineering Hunan University of Science and TechnologyXiangtan 411201China School of Civil and Architectural engineering Hainan UniversityHaikou 570228China School of Qilu Transportation Shandong UniversityJinan 250002China

tunnelling has increasingly become an essential tool in the exploration of underground space.A typical construction problem is the face instability during tunnelling,posing a great threat to associated *** face instability often occurs with the soil arching *** study investigates the combined effect of cutterhead opening ratio and soil non-uniformity on soil arching effect and face stability,via conducting random finite-element analysis coupled with Monte–Carlo *** results underscore that the face stability is strongly associated with the evolution of stress *** obtained stability factors in the uniform soils can serve as a reference for the design of support pressure in practical tunnelling *** addition,non-uniform soils exhibit a lower stability factor than uniform soils,which implies that the latter likely yields an underestimated probability of face *** tunnel face is found to have a probability of failure more than 50%if the spatial non-uniformity of soil is *** the end,a practical framework is established to determine factor of safety(FOS)corresponding to different levels of probability of face failure considering various opening ratios in non-uniform *** required FOS is 1.70 to limit the probability of face instability no more than 0.1%.Our findings can facilitate the prediction of probability of instability in the conventionally deterministic design of face pressure.

关键词： Tunnel Face stability Soil arching effect Cutterhead opening ratio Non-uniform soil Random field

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单轴压缩和巴西劈裂试验条件下Ⅰ类和Ⅱ类岩石的荷载速率依存性指标研究

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Journal of Central South University 2023年第2期30卷 477-487页

作者：张海龙汤杨俞缙 OKUBO Seisuke School of Civil engineering Chongqing University of Arts and SciencesChongqing 402160China fujian research center for tunnelling and urban underground space engineering Huaqiao UniversityXiamen 361021China Department of Systems Innovation The University of Tokyo7-3-1HongoBunkyo-kuTokyo113-8656Japan

掌握岩石的时间依存性,对于估算地下结构的长期变形和稳定性是必不可少的。本文采用恒定加载速率(CLR)和交替加载速率(ALR)方法,对Ⅰ类和Ⅱ类岩石在单轴压缩(UC)和巴西劈裂(BT)条件下的全应力-应变曲线、峰值强度、加载速率效应和杨氏... 详细信息

掌握岩石的时间依存性,对于估算地下结构的长期变形和稳定性是必不可少的。本文采用恒定加载速率(CLR)和交替加载速率(ALR)方法,对Ⅰ类和Ⅱ类岩石在单轴压缩(UC)和巴西劈裂(BT)条件下的全应力-应变曲线、峰值强度、加载速率效应和杨氏模量进行了比较分析,探寻了两种条件下岩石的相似性和差异性,同时,对荷载速率依存性进行了量化分析和深入研究。结果表明,两种加载条件下的全应力-应变曲线具有相似的规律;不同类型岩石的单轴压缩强度与劈裂强度的相关系数k在0.0424~0.1394的范围内,两者可以相互转化;劈裂模量与弹性模量之间存在线性关系,两个模量具有明显的时间依存性,且可相互转换;把常数n作为岩石荷载速率依存性指标,其值与加载条件、试验环境等因素相关,地下岩体的速率依存性指标值n可定量评价和预测地下结构的长期稳定性。建立了基于n值的可变模量本构方程,模拟了两种试验条件下的实验数据,计算结果的一致性较好。

关键词：深部岩体 Ⅰ和Ⅱ类岩石单轴压缩巴西劈裂时间依存性

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黄原胶生物聚合物固化红黏土力学行为及强化机制

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Journal of Central South University 2023年第6期30卷 1948-1963页

作者：翁之宇俞缙邓永锋蔡燕燕王立娜 fujian research center for Tunneling and urban underground space engineering Huaqiao UniversityXiamen 361021China Institute of Geotechnical engineering Southeast UniversityNanjing 211189China College of Construction engineering Yunnan Agricultural UniversityKunming 650201China

红黏土不良的岩土特性会诱发工程病害,而大量使用水泥、石灰等传统无机固化材料处理红黏土会对生态环境造成不可逆的影响,有必要探索低环境影响材料用以提升红黏土的工程力学性能,经固化的红黏土既可充当工程材料运用,又满足绿色可持续... 详细信息

红黏土不良的岩土特性会诱发工程病害,而大量使用水泥、石灰等传统无机固化材料处理红黏土会对生态环境造成不可逆的影响,有必要探索低环境影响材料用以提升红黏土的工程力学性能,经固化的红黏土既可充当工程材料运用,又满足绿色可持续发展需求。目前,黄原胶(XG)生物聚合物被视为一种极具挖掘潜力的环境友好型土壤稳定材料,具有优异的假塑性、安全性和稳定性等特性。本文为了系统地探究黄原胶生物聚合物对红黏土的固化效用及强化机制,在不同黄原胶掺量和养护龄期条件下,对固化后的红黏土开展了无侧限抗压强度试验、不固结不排水剪切试验、扫描电镜-能谱(SEM-EDS)及X射线衍射(XRD)测试。结果表明,在1.5%最佳掺量和28 d标养下,XG有效提升了红黏土的宏观力学性能,固化体的抗压强度和粘聚力分别提高了93.31%和79.47%;引入Duncan-Chang本构模型并进行修正,建立了适用于描述黄原胶生物聚合物固化红黏土应力-应变关系的数学模型,计算结果与试验结果一致性较好;黄原胶生物聚合物通过与红黏土和水分子之间的离子键作用,在固化体微观结构演化过程中产生显著的胶结和充填效应,最终形成致密的复合材料基体。

关键词：土壤固化红黏土黄原胶生物聚合物力学行为强化机制

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Experimental investigation on deformation characteristics and permeability evolution of rock under confining pressure unloading conditions

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Journal of Central South University 2018年第8期25卷 1987-2001页

作者： CHEN Xu TANG Chun-an YU Jin ZHOU Jian-feng CAI Yan-yan School of Resources and Civil engineering Northeastern UniversityShenyang 110819China School of Civil and Hydraulic engineering Dalian University of TechnologyDalian 116024China fujian research center for Tunneling and urban underground space engineering Huaqiao UniversityXiamen 361021China

Deformation behavior and hydraulic properties of rock are the two main factors that influence safety of excavation and use of rock engineering due to in situ stress *** primary objective of this study is to explore deformation characteristics and permeability properties and provide some parameters to character the rock under unloading conditions.A series of triaxial tests with permeability and acoustic emission signal measurement were conducted under the path of confining pressure unloading prior to the peak *** behavior and permeability evolution in the whole stress–strain process based on these experimental results were analyzed in *** demonstrate that,under the confining pressure unloading conditions,a good correspondence relationship among the stress–axial strain curve,permeability–axial strain curve and acoustic emission activity pattern was *** the confining pressure was unloaded,the radial strain grew much faster than the axial strain,which induced the volumetric strain growing *** failures under confining pressure unloading conditions featured brittle shear failure with a single macro shear rupture *** the decrease in deformation modulus during the confining pressure unloading process,the damage variable gradually increases,indicating that confining pressure unloading was a process of damage accumulation and strength *** the entire loading and unloading process,there was a certain positive correlation between the permeability and volumetric strain.

关键词： unloading rock mechanics permeability evolution triaxial experiment acoustic emission sandstone

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