合肥地区黏土膨胀特性研究  

Study on Expansive Characteristics of Cohesive Soil in Hefei Area

作　　者：周罡 李淮 杨新安[3] 陈翔 ZHOU Gang;LI Huai;YANG Xin’an;CHEN Xiang(Guangzhou Key Public Construction Project Management Center,510030,Guangzhou,China;不详)

机构地区：[1]广州市重点公共建设项目管理中心,广州510030 [2]中交第三航务工程局集团有限公司,上海200030 [3]同济大学道路与交通工程教育部重点实验室,上海201804

出　　处：《城市轨道交通研究》2022年第12期193-197,共5页Urban Mass Transit

摘　　要：在合肥地区地铁隧道施工现场取典型黏土地层原状土样,进行了一系列室内试验和电镜试验,对合肥地区典型黏土土样的膨胀特性进行了研究。研究结果表明:合肥地区黏土土样具有弱膨胀性;得到了合肥地区典型黏土的膨胀力数据;合肥地区黏土的抗剪强度参数与含水率之间存在负指数函数关系;两种黏土存在裂隙结构面和致密结构面,微孔隙、微裂隙和黏土的颗粒排列等的差别是其具有不同膨胀特性的原因。A series of laboratory and electron microscope tests are carried out on undisturbed soil samples of typical clay stratum taken from Hefei Metro tunnel construction site,and the expansive characteristics of typical clay soil samples in Hefei area are studied.Results show that:the clay samples in Hefei area have weak expansibility;the expansive force data of typical clays in Hefei area are obtained;there is a negative exponential function relationship between the shear strength parameters and water content of the clays in Hefei area;there are fracture structural planes and compact structural planes in the two types of clay,and the differences of micro pores,micro cracks and clay particle arrangement are the reasons for their different expansion characteristics.

关 键 词：黏土 膨胀特性 原状土样 室内试验 电镜试验 

分 类 号：TU411[建筑科学—岩土工程]