JRC-JCS模型与直剪试验对比研究  

COMPARISON STUDY OF JRC-JCS MODEL AND DIRECT SHEAR TEST

作　　者：杜时贵[1] 胡晓飞[2] 郭霄 卢锡雷 应培新 

机构地区：[1]浙江工业职业技术学院,浙江杭州311231 [2]金华职业技术学院,浙江金华321017 [3]浙江省交通规划设计研究院,浙江杭州310006 [4]浙江海天建设集团有限公司,浙江东阳322100

出　　处：《岩石力学与工程学报》2008年第S1期2747-2753,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(40672186);浙江省自然科学基金资助项目(60036);浙江省重大科技专项基金项目(2006C11128)

摘　　要：结构面抗剪强度是影响工程岩体稳定的重要因素,它决定工程岩体破坏的可能性。基于结构面粗糙度系数定向统计测量技术的JRC-JCS模型可以考虑地质和环境因素的影响,具有费用低、速度快、简便易行等特点,是获取工程岩体无填充或少填充硬岩结构面抗剪强度参数的实用方法,已为50多个岩体工程提供了结构面抗剪强度参数。为分析JRC-JCS模型评价结构面抗剪强度参数的可靠性,选取天然岩石结构面试样,进行干燥状态和饱和状态结构面抗剪强度直剪试验和JRC-JCS模型评价的对比研究。结果表明,在结构面粗糙度系数的定向统计测量、尺寸效应分析,以及剪切过程衰减折减的基础上,运用结构面粗糙度系数定向统计测量技术的JRC-JCS模型评价的结构面抗剪强度参数与直剪试验结果具有较好的一致性,JRC-JCS模型对结构面峰值摩擦角有较好的预测能力。Shear strength of structural plane has an important influence on stability of engineering rock mass. It determines the probability of engineering rock mass failure. JRC-JCS model based on directional statistical measurement technology of roughness coefficient of structural plane can consider the effect of geology and environment. For structural planes with few filling or without filling,JRC-JCS model with advantages of low cost,fast estimation and easy manipulation can provide a practical method to obtain the shear strength parameters of structural plane in hard rocks. The model has been applied to fifty rock projects in order to get the shear strength parameters of structural planes. To analyze the reliability of estimating the shear strength parameters of structural planes with JRC-JCS model,the shear strengths of natural rocks with structural plane under dry and saturated conditions are measured by direct shear test and empirical estimation with JRC-JCS model. Then,the test results of shear strength are compared. The results show that the shear strength parameters estimated by JRC-JCS model and direct shear test agree well with each other on the basis of the directional statistical measurement,the analysis of JRC scale effect and the consideration of reduced JRC during the course of shear;and JRC-JCS model can estimate the peak friction angle of structural plane well.

关 键 词：岩石力学 结构面抗剪强度 直剪试验 JRC-JCS模型 结构面粗糙度系数 对比研究 

分 类 号：TU452[建筑科学—岩土工程]