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Modularized and Parametric Modeling Technology for Finite Element Simulations of Underground Engineering under Complicated Geological Conditions

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Computer Modeling in Engineering & Sciences 2024年第7期140卷 621-645页

作者： Jiaqi Wu Li Zhuo jianliang pei Yao Li Hongqiang Xie Jiaming Wu Huaizhong Liu State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resource and HydropowerSichuan UniversityChengdu610065China Research Institute of Testing and Inspection Sinohydro Bureau 7 Co.Ltd.Chengdu610213China

The surrounding geological conditions and supporting structures of underground engineering are often updated during construction,and these updates require repeated numerical *** improve the numerical modeling efficiency of underground engineering,a modularized and parametric modeling cloud server is developed by using Python *** basic framework of the cloud server is as follows:input the modeling parameters into the web platform,implement Rhino software and FLAC3D software to model and run simulations in the cloud server,and return the simulation results to the web *** modeling program can automatically generate instructions that can run the modeling process in Rhino based on the input modeling *** main modules of the modeling program include modeling the 3D geological structures,the underground engineering structures,and the supporting structures as well as meshing the geometric *** particular,various cross-sections of underground caverns are crafted as parametricmodules in themodeling *** and parametric modeling program is used for a finite element simulation of the underground powerhouse of the Shuangjiangkou Hydropower *** complicatedmodel is rapidly generated for the simulation,and the simulation results are ***,this modularized and parametric modeling program is applicable for three-dimensional finite element simulations and analyses.

关键词： Underground engineering modularized and parametric modeling finite element method complex geological structure cloud modeling

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Ⅱ型断裂韧度测试功能开发与试验分析

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实验力学 2024年第1期39卷 34-42页

作者：卓莉裴建良刘怀忠肖明砾谢红强四川大学水利水电学院水力学与山区河流开发保护国家重点实验室四川成都610065

断裂韧度作为岩石的重要力学指标,对认识压剪破坏规律具有重要意义。为解决现有设备缺乏围压冲剪试验(PTS/CP)测试功能的问题,本文基于Ⅱ型断裂韧度测试方法进行试验装置开发,在现有设备上实现了PTS/CP测试功能,并通过青砂岩的PTS/CP试... 详细信息

断裂韧度作为岩石的重要力学指标,对认识压剪破坏规律具有重要意义。为解决现有设备缺乏围压冲剪试验(PTS/CP)测试功能的问题,本文基于Ⅱ型断裂韧度测试方法进行试验装置开发,在现有设备上实现了PTS/CP测试功能,并通过青砂岩的PTS/CP试验验证了开发装置的可靠性。青砂岩PTS/CP试验结果表明,在围压侧向约束条件下岩石试样可获得较理想的冲剪破坏面,且随着围压的增大,Ⅱ型断裂韧度K_(ⅡC)先增大后趋于稳定;通过PTS/CP试验所获得的青砂岩K_(ⅡC)与其单轴抗拉强度、I型断裂韧度指标之间的关系符合常规认识,说明了PTS/CP测试功能的合理性和装置的可操作性。PTS/CP测试功能的开发可为岩石及类似工程材料的相关教学和科研工作提供试验支撑。

关键词：围压冲剪试验测试功能开发 Ⅱ型断裂韧度压剪破坏

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泥岩卸荷力学行为、声发射特征及能量演化研究

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三峡大学学报（自然科学版） 2024年第2期46卷 47-54页

作者：张良泉刘建锋裴建良刘怀忠四川大学水利水电学院成都610065

为了更好地探究水利水电工程地下开挖施工时泥岩损伤演化,利用四川大学MTS 815混凝土与岩石力学试验系统开展泥岩三轴卸荷试验,试验共设置3种围压(10,20,25 MPa),采用加围压-恒围压加轴压-加轴压卸围压的方式加载,同步进行声发射数据采... 详细信息

为了更好地探究水利水电工程地下开挖施工时泥岩损伤演化,利用四川大学MTS 815混凝土与岩石力学试验系统开展泥岩三轴卸荷试验,试验共设置3种围压(10,20,25 MPa),采用加围压-恒围压加轴压-加轴压卸围压的方式加载,同步进行声发射数据采集,从力学行为、声发射特征和能量演化的角度分析试验结果.结果表明:围压越高,卸载后对试样的影响越大,泥岩的体积膨胀特性更显著,试样破坏时的卸荷比更小,弹性应变能和耗散能的增速越快.随着卸荷比增大,泥岩的变形模量会先增大后减小,内摩擦角、黏聚力、剪胀角增大,弹性应变能增大,耗散能先增大后趋于稳定甚至下降.在峰值应力出现前会出现声发射振铃计数率的高值,围压的增大会延缓声发射活跃期的出现,同时声发射累计计数与能量会增加.

关键词：泥岩卸荷变形模量强度参数声发射能量演化

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Influence of volume compression on the unloading deformation behavior of red sandstone under damage-controlled cyclic triaxial loading

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第5期15卷 1200-1212页

作者： Huaizhong Liu jianliang pei Jianfeng Liu Mingli Xiao Li Zhuo Hongqiang Xie State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resources and HydropowerSichuan UniversityChengdu610065China

A reasonable evaluation of unloading deformation characteristics is of great significance for the effective analysis of deformation and stability of surrounding rocks after underground *** this study,the damage-controlled cyclic triaxial loading tests were conducted to investigate the pore compaction mechanism and its influences on the unloading deformation behavior of red sandstone,including Young’s modulus,Poisson’s ratio,volumetric strain,and irreversible *** experimental results show that the increases of volumetric and irreversible strains of rocks can be attributed to the compaction mechanism,which almost dominates the entire pre-peak deformation *** unloading deformation consists of the reversible linear and nonlinear strains,and the irreversible strain under the influence of the porous grain *** pre-peak Young’s modulus tends to increase and then decrease due to the influence of the unloading irreversible ***,it hardly changes with the increasing volumetric strain compaction under the influence of reversible nonlinear ***,the initial unloading tangent modulus is highly related to the volumetric strain,and clearly reflects the compaction state of red ***,both the reversible nonlinear and irreversible unloading deformations are independent of confining *** study is beneficial for the theoretical modeling and prediction of cyclic unloading deformation behavior of red sandstone.

关键词： Cyclic loading tests Compaction mechanism Volumetric strain Unloading tangent modulus Red sandstone

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Investigation of meso-failure behaviors of Jinping marble using SEM with bending loading system

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Journal of Rock Mechanics and Geotechnical Engineering 2015年第5期7卷 593-599页

作者： Jianping Zuo Xu Wei jianliang pei Xiaoping Zhao School of Mechanics and Architectural Engineering China University of Mining and Technology State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology College of Water Resources and Hydropower Sichuan University

In th is study, th e m eso-failure m ech an ism an d fracture surface o f Jinping m arble w ere investigated bym ean s o f scanning electro n m icroscope （SEM） w ith ben d in g loading system and laser-scanner equipment. The Y antang an d B aishan m arbles specim ens from Jinping II hyd ro p o w er sta tio n w ere used. Testresu lts show th a t th e fracture to u g h n ess and m echanical behaviors o f Y antang m arble w ere basicallyh ig h er th a n th o se o f Baishan m arble. This is m ainly d u e to th e fact th a t Baishan m arble co n tain s a largep ercen tag e o f d o lom ite an d m in o r mica. Crack pro p ag atio n p a th and fracture m orphology in d icated th a tth e d irection o f ten sile stress has a significant effect on th e m echanical behaviors an d fracture toughnesso f B aishan m arble. For Yantang an d B aishan m arbles, a large n u m b e r o f m icrocracks a ro u n d th e m aincrack tip w ere observed w h e n th e directio n o f ten sile stress w as parallel to th e bed d in g plane.C onversely, few m icrocracks o ccurred w h e n th e directio n o f ten sile stress w as p erp en d icu lar to th ebed d in g plane. The presen ce o f a large n u m b e r o f m icrocracks a t th e m ain crack tip d ecreased th e globalfracture to u g h n ess o f m arble. The results o f th re e -p o in t ben d in g te sts show ed th a t th e average bearingcapacity o f intact m arble is 3.4 tim es th e notch ed m arble, b u t th e ductility p ro p e rty o f th e defectivem arble afte r p eak load is b e tte r th a n th a t o f th e intact m arble. H ence, large d efo rm atio n m ay beg en erated before failure o f in tact m arbles a t Jinping II h y d ro p o w er station. The fractal d im en sio n o ffracture surface w as also calculated by th e cube covering m eth o d . O bservational resu lt show ed th a t th elargest fractal dim en sio n o f Y antang m arble is cap tu red w h e n th e directio n o f ten sile stress is parallel toth e bedding plane. H ow ever, th

关键词： Jinping marble Bedding plane Meso-failure mechanism Scanning electron microscope (SEM) In-situ observation

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Failure behavior of a rock-coal-rock combined body with a weak coal interlayer

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International Journal of Mining Science and Technology 2013年第6期23卷 907-912页

作者： Zuo Jianping Wang Zhaofeng Zhou Hongwei pei jianliang Liu Jianfeng State Key Laboratory of Coal Resources and Safe Mining China University of Mining&Technology School of Mechanics and Civil Engineering China University of Mining&Technology College of Hydraulic and Hydroelectric Engineering Sichuan University

Using an MTS 815 testing machine,the deformation and failure behavior of a rock-coal-rock combined body containing a weak coal interlayer has been investigated and described in this *** loading leads to the appearance of mixed cracks in the coal body which induce instability and lead to bursts in *** the mixed crack propagates at a sufficiently high speed to carry enough energy to damage the roof rock,then coal and rock bursts may occur-this is the main mechanism whereby coal bumps or coal and rock bursts occur after excavation *** increasing confining pressure,the failure strength of a rock-coal-rock combined body gradually increases,and the failure mechanism of the coal interlayer also changes,from mixed crack damage under low confining pressures,to parallel crack damage under medium confining pressures,and finally to single shear crack damage or integral mixed section damage under high confining *** general,it is shown that a weak coal interlayer changes the form of overall coal damage in a rock-coal-rock combined body and reduces the overall stability of a coal ***,the whole failure behavior of a rock-coal-rock combined body in large cutting height working faces is controlled by these mechanisms.

关键词： Cracks Failure (mechanical) Loading Rock bursts Rock pressure Rocks Unloading

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富水砂层大直径深竖井开挖稳定性有限元分析

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四川水力发电 2024年第1期43卷 116-122页

作者：周巾森肖明砾谢红强何江达裴建良四川大学水力学与山区河流开发保护国家重点实验室四川成都610065 四川大学水利水电学院四川成都610065

某输水隧洞盾构接收竖井具有开挖直径大、深度深、砂层水位高的特点,对开挖过程中竖井结构受力和变形提出更高的要求。笔者以该竖井工程为研究对象,采用有限元分析方法模拟了竖井的施工过程,研究了竖井地下连续墙及地层在开挖过程中的... 详细信息

某输水隧洞盾构接收竖井具有开挖直径大、深度深、砂层水位高的特点,对开挖过程中竖井结构受力和变形提出更高的要求。笔者以该竖井工程为研究对象,采用有限元分析方法模拟了竖井的施工过程,研究了竖井地下连续墙及地层在开挖过程中的位移、应力规律。分析结果表明:竖井开挖完成后,地表最大隆起为39.50 mm,出现在井口附近;地层最大隆起为41.60 mm,出现在井底地层。地下连续墙最大水平位移为2.79 mm,出现在竖井顶部,地下连续墙顶部水平位移计算值与实测值吻合较好。地下连续墙最大拉应力为1.13 MPa,未超过混凝土标准抗拉强度,表明盾构接收竖井开挖稳定性良好。笔者分析方法及结果可供类似工程参考。

关键词：富水砂层竖井开挖地下连续墙数值模拟

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桩筏基础–土动力相互作用的离心机模型试验研究

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岩石力学与工程学报 2011年第7期30卷 1488-1495页

作者：马亢裴建良厦门大学建筑与土木工程学院厦门福建361005 四川大学水力学与山区河流开发保护国家重点实验室四川成都610065

通过开展离心机动力模型试验,深刻地揭示桩筏基础与土之间的动力相互作用将造成基础和土体运动的非一致性,土体的运动不能代表基础的运动,两者在加速度时程、反应谱特征、共振周期等方面均存在显著的差异,传统结构抗震设计中采用自由场... 详细信息

通过开展离心机动力模型试验,深刻地揭示桩筏基础与土之间的动力相互作用将造成基础和土体运动的非一致性,土体的运动不能代表基础的运动,两者在加速度时程、反应谱特征、共振周期等方面均存在显著的差异,传统结构抗震设计中采用自由场土体的动力参数直接作为基础的动力参数是极不严格的;基础与土之间的动力相互作用将导致周围土体发生重塑软化,且基础附近的土体(近场)软化程度明显高于远场土体(自由场土体),加之土体自身的应变软化和强度降低的内在机制将共同导致土体的周期明显延长;然而,在地震作用下,桩筏基础几乎不发生软化,这与土体有着本质的区别;在相同条件下,基础的共振周期小于土体周期(近场和远场),远场土体(自由场土体)周期小于基础附近的土体周期(近场土体);土体的动力软化对结构的影响甚微。

关键词：桩基工程地震桩筏基础软黏土相互作用土体软化共振周期离心机模型试验

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Investigation of mechanical properties of fractured marbles by uniaxial compression tests

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Journal of Rock Mechanics and Geotechnical Engineering 2011年第4期3卷 302-313页

作者： Hepine Xie jianliang pei Jianping Zuo Ru Zhang State Key Laboratory of Hydraulics and Mountain River Engineering Sichuan University Chengdu 610065 China College of Hydraulic and Hydroelectric Engineering Sichuan University Chengdu 610065 China Institute of Rock Mechanics and Fractals School of Mechanics and Civil Engineering China University of Mining and Technology Beijing 100083 China

Uniaxial compression tests （UCTs） on 34 naturally fractured marble samples taken from the transportation tunnels of Jinping I1 hydropower station were carried out using the MTS815 Flex test GT rock testing system. Rockburst proneness index WET is determined for the marble samples with the UCTs. According to the number, size and spatial structure characteristics of the internal natural fractures of the marble samples, fractures are basically divided into 4 types, namely, single fracture, parallel fracture, intersectant fracture and mixed fracture. The mechanical properties of naturally fractured rocks （4 types） are analyzed and compared with those of intact rock samples （without natural fractures）. Experimental results indicate that failure characteristics of fractured rocks are appreciably controlled by fracture distribution or fracture patterns. In comparison with intact rocks, the failure of fractured marbles is a locally progressive failure process and finally rocks fail abruptly. Statistically, the uniaxial compressive strengths （UCSs） of rocks with single, parallel, intersectant and mixed fractures are 0.72, 0.69, 0.59 and 0.46 times those of the intact rocks, respectively. However, the elastic modulus of the fractured Yantang marbles is generally not different from that of intact rocks. But the elastic moduli of Baishan marble with single, intersectant and mixed fractures are 0.61, 0.62 and 0.45 times those of intact rocks, respectively. Experimental results also indicate that WEt of fractured marbles is generally smaller than that of intact marbles, which implies that rockburst intensity of fractured marble in field may be controlled to some extent. In addition, the bearing capacity of surrounding rocks is also reduced, thus the surrounding rocks should be supported or reinforced timely according to practical conditions.

关键词： rock mechanics naturally fractured rocks deformation and failure of rocks rock strength

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层状大理岩卸荷力学特性试验研究

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岩石力学与工程学报 2009年第12期28卷 2496-2502页

作者：裴建良刘建锋徐进四川大学水利水电学院四川成都610065

以锦屏一级水电站地下厂房实际应力环境为基础,利用MTS815 Flex TestGT岩石力学试验系统,对该厂房区域典型层状大理岩开展常规三轴加、卸荷破坏试验研究。研究成果表明:平行层理面压缩时,卸荷试验得到的抗剪断、抗剪强度参数较加载试验... 详细信息

以锦屏一级水电站地下厂房实际应力环境为基础,利用MTS815 Flex TestGT岩石力学试验系统,对该厂房区域典型层状大理岩开展常规三轴加、卸荷破坏试验研究。研究成果表明:平行层理面压缩时,卸荷试验得到的抗剪断、抗剪强度参数较加载试验得到的c,φ值低,残余内摩擦角φr值却较高;相同卸荷条件下,垂直层理面压缩得到的抗剪断、抗剪强度参数较平行层理面压缩得到的c,φ高,φr值却较低;卸荷条件下岩样的破坏是其向卸荷方向的强烈扩容所致,峰值强度后继续卸荷对岩石峰后承载力有显著的弱化作用;试验得到的各组弹性模量大致随围压增加而增加,而峰值应力对应的变形模量则反之,单个岩样在卸荷试验中,变形模量大致随围压卸荷而降低,垂直层理面压缩得到的变形模量较平行层理面压缩的高20%～51%,侧胀系数μ的变化规律则反之,前者较后者的低3%～12%;在相同卸荷条件下,平行层理面压缩时,岩石更易发生破坏,而垂直层理面压缩时,大理岩的脆性变形特征更显著。这些结论揭示了层状大理岩的卸荷力学特性,对解决工程实际问题有重要的参考价值。

关键词：岩石力学层状岩体卸荷破坏变形特征力学参数试验研究

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