结构面发育硬质黏土原位剪切试验研究  

Research on In Situ Shear Tests of Flint Clay with Developmental Structural Planes

作　　者：陆海玉 王润泽 沈英朋 刘猛 侯玉松 蒋伟春 LU Haiyu;WANG Runze;SHEN Yingpeng;LIU Meng;HOU Yusong;JIANG Weichun(Shandong Survey and Design Institute of Water Conservancy Co.,Ltd.,Jinan 250013,Shandong,China;Zhaoyuan Survey and Design Institute of Water Conservancy,Yantai 265400,Shandong,China;School of Water Conservancy and Environment,University of Jinan,Jinan 250022,Shandong,China;China Tinho Construction Management Group Co.,Ltd.,Dongying 257091,Shandong,China)

机构地区：[1]山东省水利勘测设计院有限公司,山东济南250013 [2]招远市水利勘测设计院,山东烟台265400 [3]济南大学水利与环境学院,山东济南250022 [4]中天昊建设管理集团股份有限公司,山东东营257091

出　　处：《济南大学学报（自然科学版）》2023年第3期362-367,共6页Journal of University of Jinan(Science and Technology)

基　　金：国家自然科学基金项目(42002257)。

摘　　要：为了解决黏土层间黏结强度弱,受扰动后易开裂,导致现场取样和室内试验难度较大,并且结构面发育的硬质黏土原位剪切试验数据相对匮乏的问题,针对缓倾角顺层结构面发育的第四系中更新统硬质黏土进行原位剪切试验,通过设计不同竖向压力级别,对比室内剪切试验及室内三轴试验结果,探讨结构面发育的硬质黏土剪切强度及剪切破坏模式,合理确定硬质黏土的剪切强度。结果表明:在原位剪切过程中,硬质黏土的剪切强度受结构面控制;综合分析土体结构与试验结果,硬质黏土的剪切强度可取内摩擦角为14.1°,黏聚力为27 kPa;除室内三轴试验中的黏聚力外,原位剪切试验硬质黏土的剪切强度普遍小于室内试验硬质黏土的剪切强度。To solve the problem of weak bonding strength between clay layers and easy to crack after being disturbed,making it difficult to take samples at the site and indoor tests,and resulting in relative lack of in situ shear test data of flint clay with developmental structural planes,field in situ shear tests were carried out on quaternary system holocene series flint clay developed by slow inclination along structural planes.Shear strength and shear failure mode of flint clay with developmental structural planes were discussed by designing different vertical pressure levels and comparing results of indoor shear test and indoor triaxial test,and the shear strength of flint clay was reasonably determined.The results show that the shear strength of flint clay is controlled by the structural planes during in situ shearing.Based on comprehensive analysis of soil structure and test results,the shear strength of flint clay can be taken as internal friction angle of 14.1°and cohesion of 27 kPa.In addition to the cohesion in the indoor triaxial test,the shear strength of flint clay obtained by using in situ shear test is generally less than that obtained by using indoor tests.

关 键 词：土力学 剪切强度 原位剪切试验 结构面 黏土 

分 类 号：TU14[建筑科学—建筑理论]