土与结构接触面力学特性环剪试验研究  

Experimental study of mechanical behaviour of soil-structure interface by ring shear test

作　　者：杨有莲[1,2] 朱俊高[1,2] 余挺[3] 吴晓铭 

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,南京210098 [2]河海大学岩土工程科学研究所,南京210098 [3]成都勘测设计研究院,成都610072 [4]国电大渡河流域水电开发有限公司,成都610016

出　　处：《岩土力学》2009年第11期3256-3260,共5页Rock and Soil Mechanics

基　　金：国家自然科学基金委员会;二滩水电开发有限责任公司雅砻江水电开发联合基金项目(No.50639050)

摘　　要：利用环剪仪对不同的土与混凝土接触面的力学特性进行了研究。分别对有泥皮及没有泥皮的接触面情况进行试验,并对剪切面位于黏土内的情况进行了试验。结果表明,不同接触面的应力-应变特性差异很大,泥皮的存在明显改变了接触面的性状;对没有泥皮的情况,剪切破坏面可能发生在土体内部,也可能发生在土-混凝土接触界面;而有泥皮时,破坏面始终发生在泥皮内部。试验的各种接触界面中,破坏时平均剪应力与法向应力具有较好的线性关系,接触面强度可用摩尔-库仑准则较好地描述;当有泥皮存在时,摩擦角为没有泥皮时的63.4%。The mechanical behaviour of soil-structure interface was investigated by using ring shear apparatus. The different interfaces include three types. The test results show that the stress-strain behaviour of different interfaces is apparently different. Mud-cake can change the contacting properties of interface. For the case without mud-cake, failure plane may occur in soil or on soil-structure interface. For that with mud-cake, for example drilling pore pile, failure plane is always taking place in mud-cake. In all tests, the relationship between average shear stress and normal stress is linear; and the shear strength of interface may be described with Mohr-Coulomb criterion. Friction angle of interface with mud-cake is only 63.4 % of that without mud-cake.

关 键 词：环剪仪 接触面 泥皮 应力应变关系 摩擦强度 摩擦角 

分 类 号：TU411[建筑科学—岩土工程]