胶东白垩系泥岩现场岩体抗剪强度试验研究  

In-situ Test Research on Shear Strength of Cretaceous Mudstone in Jiaodong

作　　者：田利川 Tian Lichuan(China Railway Design Corporation,Tianjin 300308,China)

机构地区：[1]中国铁路设计集团有限公司,天津300308

出　　处：《岩土工程技术》2022年第1期74-78,共5页Geotechnical Engineering Technique

摘　　要：我国胶东地区广泛分布白垩系泥岩地层,其具有遇水软化、膨胀,失水收缩、崩解等工程特性,岩体抗剪强度的准确确定对该区域基坑、边坡稳定性设计和施工具有重要意义。通过开展现场岩体抗剪试验和室内岩石直剪试验,得出岩体与岩石内摩擦系数和内摩擦角基本一致,岩石黏聚力是岩体黏聚力的10.6倍,分析二者差异原因主要有岩石直剪试验岩样代表性差、扰动大、数据离散性大、尺寸效应和试样完整性差异等,现场岩体抗剪试验得出的岩体抗剪强度参数更能真实反映岩体实际工程性质,可用于工程设计和优化。Cretaceous mudstone is widely distributed in Jiaodong area of China,which has the characteristics of softening and expansion in water,as well as shrinkage and disintegration with water loss.The accuracy of rock shear strength is significant for construction and design of foundation and slope stability.According to the in-situ shear tests and laboratory direct shear tests,the results show that the internal friction coefficient and internal friction angle are basically the same.The cohesion of rock is 10.6 times that of rock mass.The main reasons for differences are poor representativeness,large disturbance,big divergence,size effect,and sample integrity etc.The in-situ shear test can be more truly reflect the actual engineering properties,which is available for engineering design and optimization.

关 键 词：泥岩 岩体抗剪试验 内摩擦角 黏聚力 

分 类 号：TU45[建筑科学—岩土工程]