半成岩结构面原位直剪试验及抗剪参数的研究  

Study on In-situ Direct Shear Tests and Shear Parameters of Structural Planes of Semi-diagenetic Rocks

作　　者：季小凯 王杰 刘明明 李冬 Ji Xiaokai;Wang Jie;Liu Mingming;Li Dong(Shandong Survey and Design Institute of Water Conservancy Co.Ltd.,Jinan,Shandong 250013)

机构地区：[1]山东省水利勘测设计院有限公司,山东济南250013

出　　处：《江西建材》2024年第4期156-160,共5页

摘　　要：半成岩作为一种特殊性岩土,工程性质受岩体结构面的影响较大,因此,确定结构面的剪切强度参数十分重要。文中根据半成岩原位剪切试验结果,采用概率统计分析方法,对抗剪强度参数进行估算,同时对M-C准则模型、B-B准则模型的95%预测区间和95%置信区间进行拟合及评价。结果表明,B-B准则模型的95%置信区间较M-C准则的范围更窄,参数估计的可靠性更高,尤其低法向应力水平下,B-B准则模型明显优于M-C准则模型,其抗剪强度参数更准确。Asa class of speciality geotechnical rocks,the engineering properties of semi-diagenetic rocks are greatly influenced by the structur-al planes of the rock body,so it is very important to determine the shear strength parameters of the structural planes.In this paper,probabilistic statistical analysis is used to estimate the shear strength parameters based on the results of direct shear tests on semi-diagenetic rocks,and the 95%prediction band and 95%confidence band of the M-C criterion model and the B-B criterion model were fitted and evaluated.The results show that the 95%confidence band of the B-B criterion model is narrower than that of the M-C criterion,and the reliability of the parameter estimation is higher,especially at low normal stress levels,the B-B criterion model is significantly better than the M-C criterion model,and its shear strength parameters are more accurate.

关 键 词：半成岩 结构面 直剪试验 置信区间 

分 类 号：U452[建筑科学—桥梁与隧道工程] U455[交通运输工程—道路与铁道工程]