块状多组节理岩体破坏行为及GSI预测模型研究  

Failure behavior of blocky multiple-jointed rock mass and GSI prediction model

作　　者：左建平[1,2] 杨硕[1] 沈佳轶[3] 杜建 孙宸昊 ZUO Jianping;YANG Shuo;SHEN Jiayi;DU Jian;SUN Chenhao(School of Mechanics&Civil Engineering,China University of Mining&Technology,Beijing 100083,China;International Innovation Center of Mining Rock mechanics,China University of Mining&Technology,Beijing 100083,China;Institute of Port,Coastal and Offshore Engineering,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]中国矿业大学(北京)力学与土木工程学院,北京100083 [2]中国矿业大学(北京)采矿岩石力学国际创新中心,北京100083 [3]浙江大学港口海岸与近海工程研究所,杭州310058

出　　处：《有色金属(矿山部分)》2025年第2期175-185,共11页NONFERROUS METALS(Mining Section)

基　　金：国家自然科学基金(52225404,52394192);北京市卓越青年科学家项目(BJJWZYJH01201911413037);中央高校基本科研业务费(2022YJSLJ02)。

摘　　要：节理岩体地质强度指标(GSI)是岩体工程设计及稳定性分析的重要参数,开展对节理岩体破坏形态及GSI的研究至关重要。采用经室内试验标定的花岗岩数值模型,对含有两组正交节理的块状节理岩体进行压缩模拟试验。结果显示,围压从3 MPa到10 MPa完整岩石强度提升约40%,节理岩体强度提升约166%,围压对节理岩体的强度的提升更为明显。块状节理岩体的强度和破坏随节理倾角呈现出明显的各向异性。块状节理岩体抗压强度和岩体GSI随节理倾角呈先减小后增大的非线性变化趋势。块状节理岩体在围压作用下主要发生剪切破坏、张拉破坏和剪切张拉混合破坏。基于广义Hoek-Brown准则,建立了块状节理岩体GSI预测模型,块状节理岩体GSI与节理间距呈非线性关系。本文建立的模型可为工程中块状节理岩体GSI的判定提供相关依据。The Geological Strength Index(GSI)of jointed rock mass is an important parameter for rock mass engineering design and stability analysis.It is crucial to investigate the failure mode and GSI of jointed rock mass.The compression simulation test of blocky jointed rock mass with two sets of orthogonal joints was conducted using the granite numerical model calibrated by laboratory test.The results showed that the strength of intact rock increased by about 40.68%and the strength of jointed rock mass increased by about 166.01%when the confining pressure ranged from 3 MPa to 10 MPa.The confining pressure had a more obvious effect on the strength of jointed rock mass.The strength and failure of blocky jointed rock mass showed obvious anisotropy with joint inclination angle.The compressive strength and GSI of the blocky jointed rock mass showed a nonlinear trend of first decreasing and then increasing with the dip angle of the joint.The blocky jointed rock mass mainly underwent shear failure,tensile failure,and shear-tensile mixed failure under confining pressure.Based on the generalized Hoek-Brown criterion,the GSI prediction model of blocky jointed rock mass was established.The GSI of blocky jointed rock mass had a nonlinear relationship with joint spacing.The model established in this paper can provide a relevant basis for the determination of GSI of blocky jointed rock mass in engineering.

关 键 词：块状节理岩体 岩体试验 数值模拟 GSI 预测模型 

分 类 号：TU452[建筑科学—岩土工程] TD315[建筑科学—土工工程]