Study on macro-meso shear transfixion mechanisms and mechanical properties of shear band-bedrock interfaces of dangerous rock on reservoir bank
LIU Xinrong1，2，3，GUO Xueyan1，2，3，ZHOU Xiaohan1，2，3，LUO Xinyang1，2，3，#br#
WANG Hao1，2，3，LI Peiyao1，2，3，ZHOU Fuchuan1，4
(1. School of Civil Engineering，Chongqing University，Chongqing 400045，China；2. National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas，Chongqing University，Chongqing 400045，China；3. Key Laboratory of New Technology for Construction of Cities in Mountain Area of Ministry of Education，Chongqing University，Chongqing 400045，China；4. Chongqing Vocational Institute of Engineering，Chongqing 402260，China)
Abstract：Taking Banbiyan dangerous rock in the Three Gorges Reservoir Area as a research object，the formation process and characteristics of the shear band in the dangerous rock were summarized. In this paper，laboratory tests and numerical simulation were used to study the shear transfixion mechanism and mechanical properties of the shear band-bedrock interface from a macro-meso perspective. The results show that：(1) the shear band is the main controlling factor of the dangerous rock instability，and the internal filling material is laminar and unbonded. (2) Under the condition of constant normal stress，the failure modes of the interface can be summarized as step root tensile fracture-step climbing，rock slab damage-step shear fracture，rock slab crack coalescence-step shear broken. (3) Six typical stages can be observed in shear stress-shear displacement curves，including the compaction stage，the oblique crack occurring stage at the step root near the loading end，the approximate elastic deformation and micro-crack propagation stage，the step near the loading end shear fracture stage，the remaining steps shear fracture stage，and the residual stage. (4) The peak shear strength and the residual strength of the interface increase with the increase in normal stress，layer thickness and step height. The vertical cumulative displacement decreases with the increase in normal stress and increases with the increase in layer thickness and step height. (5) The interface crack number curve shape is“S”type，which can be divided into three stages，including the crack number slowly increasing stage(rock slab surface wear)，the rapid crack propagation stage(steps shear fracture)，and the crack number keeping stable stage(residual friction). The curve change trend of particle strain energy and cementation strain energy is similar to that of the shear stress-shear displacement curve，and the total energy，friction energy，and damping energy increase with the increase in shear displacement. The research results are of reference significance to the study of the mechanical properties of the shear band and the stability of the dangerous rock.
刘新荣1，2，3，郭雪岩1，2，3，周小涵1，2，3，罗新飏1，2，3，王 浩1，2，3，李沛瑶1，2，3，周福川1，4. 库岸危岩剪切带–基岩界面宏细观剪切贯通机制及力学特性研究[J]. 岩石力学与工程学报, 2024, 43(5): 1096-1109.
LIU Xinrong1，2，3，GUO Xueyan1，2，3，ZHOU Xiaohan1，2，3，LUO Xinyang1，2，3，. Study on macro-meso shear transfixion mechanisms and mechanical properties of shear band-bedrock interfaces of dangerous rock on reservoir bank. , 2024, 43(5): 1096-1109.
[1] YIN Y P，WANG L Q，HUANG B L，et al. Evolution analysis of the Banbiyan dangerous rock mass in the three gorges reservoir area[J]. Georisk，2023，17： 376–386.
[2] 陈云飞，张 鹏，黄波林，等. 考虑岩体劣化的库岸典型危岩体破坏过程与长期稳定性分析[J]. 地质力学学报，2022，28(6)：938–947.(CHEN Yunfei，ZHANG Peng，HUANG Bolin，et al. Failure process and long-term stability analysis of typical unstable rock mass in the Three Gorges Reservoir area considering rock mass deterioration[J]. Journal of Geomechanics，2022，28(6)：938–947.(in Chinese))
[3] 吴晓宾，王 平. 软件Geo-Studio在重庆市巫山县板壁岩W1危岩体稳定性分析应用[J]. 矿产与地质，2019，33(3)：535–541.(WU Xiaobin，WANG Ping. Application of Geo-Studio in the stability analysis of W1 dangerous rock body in slate rock belt in Wushan County of Chongqing City[J]. Mineral Resources and Geology，2019，33(3)：535–541.(in Chinese))
[4] PATTON F D. Multiple modes of shear failure in rock[C]// Proceeding of the Congress of 1st International Society of Rock Mechanics. [S. l.]：[s. n.]，1966：509–513.
[5] BARTON N，CHOUBEY V. The shear strength of rock joints in theory and practice[J]. Rock Mechanics and Rock Engineering，1977，10(1/2)：1–54.
[6] 夏才初，唐志成，宋英龙，等. 节理峰值剪切位移及其影响因素分析[J]. 岩土力学，2011，32(6)：1 654–1 658.(XIA Caichu，TANG Zhicheng，SONG Yinglong，et al. Analysis of relationship between joint peak shear displacement and its influence factors[J]. Rock and Soil Mechanics，2011，32(6)：1 654–1 658.(in Chinese))
[7] 宋磊博，江 权，李元辉，等. 软–硬自然节理的改进JRC-JCS剪切强度公式[J]. 岩土力学，2017，38(10)：2 789–2 798.(SONG Leibo，JIANG Quan，LI Yuanhui，et al. Improved JRC-JCS shear strength formula for soft-hard natural joints[J]. Rock and Soil Mechanics，2017，38(10)：2 789–2 798.(in Chinese))
[8] 范 祥，邓志颖，崔志猛，等. 一种新的软–硬节理峰值剪切强度模型[J]. 岩土力学，2021，42(7)：1 861–1 870.(FAN Xiang，DENG Zhiying，CUI Zhimeng，et al. A new peak shear strength model for soft-hard joint[J]. Rock and Soil Mechanics，2021，42(7)：1 861– 1 870.(in Chinese))
[9] 张志飞，黄 曼，唐志成. 估算异性岩石不连续面峰值剪切强度的经验公式[J]. 岩土力学，2023，44(2)：507–519.(ZHANG Zhifei，HUANG Man，TANG Zhicheng. Empirical criterion for evaluating the peak shear strength of discontinuity with different joint wall strengths[J]. Rock and Soil Mechanics，2023，44(2)：507–519.(in Chinese))
[10] 曹日红，曹 平，林 杭，等. 不同粗糙度的节理直剪颗粒流分析[J]. 岩土力学，2013，34(增2)：456–463.(CAO Rihong，CAO Ping，LIN Hang，et al. Particle flow analysis of direct shear tests on joints with different roughness[J]. Rock and Soil Mechanics，2013，34(Supp.2)：456–463.(in Chinese))
[11] 黄 曼，洪陈杰，杜时贵，等. 岩石结构面形貌分级方法及两级粗糙特性研究[J]. 岩石力学与工程学报，2020，39(6)：1 153–1 164. (HUANG Man，HONG Chenjie，DU Shigui，et al. Study on morphological classification method and two-order roughness of rock joints[J]. Chinese Journal of Rock Mechanics and Engineering，2020，39(6)：1 153–1 164.(in Chinese))
[12] ZHAO Y L，ZHANG C S，WANG Y X，et al. Shear-related roughness classification and strength model of natural rock joint based on fuzzy comprehensive evaluation[J]. International Journal of Rock Mechanics and Mining Sciences，2021，137：104550.
[13] 刘新荣，许 彬，黄俊辉，等. 多形态贯通型岩体结构面宏细观剪切力学行为研究[J]. 岩土工程学报，2021，43(3)：406–415.(LIU Xinrong，XU Bin，HUANG Junhui，et al. Macro-meso shear mechanical behaviors of coalescent rock joints with different morphologies[J]. Chinese Journal of Geotechnical Engineering，2021，43(3)：406–415. (in Chinese))
[14] 刘新荣，许 彬，周小涵，等. 软硬互层岩体结构面宏细观剪切力学特性[J]. 煤炭学报，2021，46(9)：2 895–2 909.(LIU Xinrong，XU Bin，ZHOU Xiaohan，et al. Investigation on the macro-meso shear mechanical properties of soft-hard interbedded rock discontinuity[J]. Journal of China Coal Society，2021，46(9)：2 895–2 909.(in Chinese))
[15] BAHAADDINI M， HAGAN P C，MITRA R，et al. Scale effect on the shear behaviour of rock joints based on a numerical study[J]. Engineering Geology，2014，81：212–223.
[16] 顾琳琳，王 振，张 锋，等. 剪切条件下结构面剪切速率依存性的动态演化[J]. 中南大学学报，2021，28(6)：1 875–1 887.(GU Linlin，WANG Zhen，ZHANG Feng，et al. Dynamic evolution of shear rate-dependent behavior of rock discontinuity under shearing condition[J]. Journal of Central South University，2021，28(6)：1 875–1 887.(in Chinese))
[17] 李海波，冯海鹏，刘 博. 不同剪切速率下岩石节理的强度特性研究[J]. 岩石力学与工程学报，2006，25(12)：2 435–2 440.(LI Haibo，FENG Haipeng，LIU Bo. Study on strength behaviors of rock joints under different shearing deformation velocities[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(12)：2 435–2 440.(in Chinese))
[18] 刘 涛，张 波，吉 锋，等. 阶坎状硬性结构面剪切贯通机制研究[J]. 地质灾害与环境保护，2023，34(1)：52–58.(LIU Tao，ZHANG Bo，JI Feng，et al. Study on the penetration mechanism of stepped rock structural lane under shear condition[J]. Journal of geological hazards and environment preservation，2023，34(1)：52–58.(in Chinese))
[19] 沈明荣，张清照. 规则齿型结构面剪切特性的模型试验研究[J]. 岩石力学与工程学报，2010，29(4)：713–719.(SHEN Mingrong，ZHANG Qingzhao. Experimental study of shear deformation characteristics of rock mass discontinuities[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(4)：713–719.(in Chinese))
[20] 范文臣，曹 平，张 科. 不同压剪应力比作用下节理类岩石材料破坏模式的试验研究[J]. 中南大学学报：自然科学版，2015，46(3)：926–932.(FAN Wenchen，CAO Ping，ZHANG Ke. Experiment study on failure style of jointed rock-like material under different compressive-shear stress ratios[J]. Journal of Central South University：Science and Technology，2015，46(3)：926–932.(in Chinese))
[21] LU Y L，WANG L G，LI Z L，et al. Experimental study on the shear behavior of regular sandstone joints filled with cement grout[J]. Rock Mechanics and Rock Eengineering，2017，50：1 321–1 336.
[22] 焦 峰，许 江，郭保华，等. 充填厚度对岩石节理剪切强度影响的剪切试验研究[J]. 采矿与安全工程学报，2022，39(2)：405–412. (JIAO Feng，XU Jiang，GUO Baohua. A shear test study on the influence of filled thickness on the shear strength of rock joints[J]. Journal of mining and safety engineering，2022，39(2)：405–412.(in Chinese))
[23] 许 江，雷 娇，刘义鑫，等. 充填物性质影响结构面剪切特性试验研究[J]. 岩土力学，2019，40(11)：4 129–4 137.(XU Jiang，LEI Jiao，LIU Yixin，et al. Experimental study on shear behavior of joints filled with different materials[J]. Rock and Soil Mechanics，2019，40(11)：4 129–4 137.(in Chinese))
[24] 何 刘，赵志明，潘 岳，等. 连续充填型结构面峰前循环破坏特征及再载强度特性试验研究[J]. 岩石力学与工程学报，2021，40(10)：2 027–2 037.(HE Liu，ZHAO Zhiming，PAN Yue，et al. Experimental study on the damage properties and reloading strength characteristics of continuous infilled rock joints under pre-peak cyclic loading[J]. Chinese Journal of Rock Mechanics and Engineering，2021，40(10)：2 027–2 037.(in Chinese))
[25] 周扬一，冯夏庭，徐鼎平，等. 含不同胶结充填物的碳酸盐岩层面剪切力学特性试验研究[J]. 岩石力学与工程学报，2016，35(6)： 1 161–1 172.(ZHOU Yangyi，FENG Xiating，XU Dingping，et al. Experimental study of the shear behavior of carbonate bedding planes cemented by different materials[J]. Chinese Journal of Rock Mechanics and Engineering，2016，35(6)：1 161–1 172.(in Chinese))
[26] 黄润秋，林 峰，陈德基，等. 岩质高边坡卸荷带形成及其工程性状研究[J]. 工程地质学报，2001，(3)：227–232.(HUANG Runqiu，LIN Feng，CHEN Deji，et al. Formation mechanism of unloading fracture zone of high slopes and its engineering behaviors[J]. Journal of Engineering Geology，2001，(3)：227–232.(in Chinese))
[27] 杨忠平，向宫固，赵 茜，等. 水动力–溶蚀作用下灰岩结构面剪切力学特性[J]. 岩土工程学报，2023，45(8)：1 555–1 563.(YANG Zhongping，XIANG Gonggu，ZHAO Qian，et al. Shear mechanical properties of limestone structural plane under hydrodynamic-dissolution[J]. Chinese Journal of Geotechnical Engineering，2023，45(8)：1 555–1 563.(in Chinese))
[28] 黄润秋，张倬元，王士天. 高边坡稳定性系统工程地质研究[M]. 成都：成都科技大学出版社，1991：116–121.(HUANG Runqiu，ZHANG Zhuoyuan，WANG Shitian，et al. Systematic engineering geology study of high rock slopes[M]. Chengdu：Publishing House of Chengdu Science and Technology University，1991：116–121.(in Chinese))
[29] 黄波林，殷跃平，李 滨，等. 三峡工程库区岩溶岸坡岩体劣化及其灾变效应[J]. 水文地质工程地质，2020，47(4)：51–61.(HUANG Bolin，YIN Yueping，LI Bin，et al. Rock mass deterioration and its catastrophic effect of karst bank slope in the Three Gorges Project Reservoir area[J]. Hydrogeology and engineering geology，2020，47(4)：51–61.(in Chinese))
[30] 雷 鹏. 硬性接触型岩体结构面剪切特性及边坡稳定性分析[硕士学位论文][D]. 重庆：重庆大学，2015.(LEI Peng. Analysis on shear properties of through discontinuity and stability of slope with through discontinuity[M. S. Thesis][D]. Chongqing：Chongqing University，2015.(in Chinese))
[31] 罗战友，黄 斌，杜时贵，等. 基于形貌全覆盖的岩石结构面抗剪强度尺寸效应试验研究[J]. 岩石力学与工程学报. https：//kns.cnki. net/kcms2/detail/42.1397.O3.20230619.1133.002.html.(LUO Zhanyou，HUANG Bin，DU Shigui，et al. Experimental study on size effect of shear strength of rock joint[J]. Chinese Journal of Rock Mechanics and Engineering. https：// kns.cnki.net/kcms2/detail/42.1397.O3.20230619. 1133.002.html.(in Chinese))
[32] 中华人民共和国国家标准编写组. GB/T 50266—2013工程岩体试验方法标准[S]. 北京：中国计划出版社，2013.( The National Standards Compilation Group of the People's Republic of China. GB/T 50266—2013 Standard for test methods of engineering rock mass[S]. Beijing：China Planning Press，2013.(in Chinese))
[33] 杨忠平，蒋源文，李诗琪，等. 土石混合体–基岩界面剪切力学特性试验研究[J]. 岩土工程学报，2020，42(10)：1 947–1 954.(YANG Zhongping，JIANG Yuanwen，LI Shiqi，et al. Experimental study on shear mechanical properties of soil-rock mixture-bedrock interface[J]. Chinese Journal of Geotechnical Engineering，2020，42(10)：1 947–1 954.(in Chinese))
[34] 杨忠平，李 进，刘浩宇，等. 土石混合体–基岩界面剪切力学特性块石尺寸效应[J]. 岩土力学，2023，44(4)：965–974.(YANG Zhongping，LI Jin，LIU Haoyu，et al. Influence of the block stone size on shear mechanical behavior of soil-rock mixture-bedrock interface[J]. Rock and Soil Mechanics，2023，44(4)：965–974.(in Chinese))
2024, Vol. 43 
