断层岩体剪切滑移变形及其临界应力判别准则  

Shear-slipe Deformation and Critical Stress State Discriminant Criteria for Fault Rock Masses

作　　者：赵鹏 冯子军[1,2] ZHAO Peng;FENG Zijun(College of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Key Laboratory of In-situ Property Improving Mining of Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学矿业工程学院,太原030024 [2]太原理工大学原位改性采矿教育部重点实验室,太原030024

出　　处：《太原理工大学学报》2022年第6期997-1003,共7页Journal of Taiyuan University of Technology

基　　金：国家自然科学基金资助项目(52122405);山西省回国留学人员科研资助项目(HGKY2019018);山西省研究生创新项目(2021Y192,2021Y289)。

摘　　要：为揭示断层岩体在滑动摩擦过程中的应力及运动规律,利用自主研制的裂隙岩体大位移剪切变形装置,研究了单裂隙花岗岩在法向应力等梯度递减过程中的剪切滑移特征及滑移临界应力状态。摩擦强化作用下,单裂隙花岗岩的失稳滑移变形不会无限增长,其滑移临界剪切应力约为该状态下法向应力的1.79倍,在法向应力等梯度降低过程中,最大剪应力降低速率平均约0.145 MPa/s,最大滑移速率平均约8.4μm/s,最大滑移加速度平均约0.547μm/s^(2);借助莫尔-库仑失稳准则建立了临界滑移条件下各应力参数之间的理论模型,将模型与实测参数比较,认为该模型可以较好地匹配实验结果。该结果对预判及评估深度地层裂隙岩体失稳滑移及临界应力状态有一定的参考价值。Deep fault rock mass may undergo large-scale slip deformation under the action of tectonic stress or engineering disturbance,which has a non-negligible impact on engineering and human activities.In order to reveal the stress and motion characteristics of fault rock mass in the process of sliding friction,the shear slip characteristics and slip critical stress state of single-fracture granite in the process of normal stress isogradient decrease were investigated on a self-developed large displacement shear deformation device for fractured rock mass.Under the action of friction strengthening,the unstable slip deformation of fractured rock mass does not increase infinitely,the critical shear stress for shear slip of single-fracture granite is about 1.79 times the normal stress in this state,during the isogradient reduction of normal stress,the average reduction rate of the maximum shear stress is about 0.145 MPa/s,the average maximum slip rate is about 8.4μm/s,and the average maximum slip acceleration is about 0.547μm/s^(2).A theoretical model among various stress parameters under critical slip conditions was established with the help of the Mohr-Coulomb criterion,and the model was compared with the measured parameters,and proved to better match experimental results.This work provides a reference value in predicting and evaluating the instability and slip state of fractured rock mass.

关 键 词：断层岩体 摩擦滑动 剪切变形 莫尔-库仑准则 

分 类 号：TU457[建筑科学—岩土工程]