一种适用于细粒土的新型叠片式单剪仪研制与应用  

A novel simple shear apparatus with stacked steel laminations for fine grained soil

作　　者：朱俊高[1] 陈鸽 王涛[1] 夏勇 彭文明 罗启迅 ZHU Jungao;CHEN Ge;WANG Tao;XIA Yong;PENG Wenming;LUO Qixun(Key Laboratory of Ministry of Education for Geotechanics and Embankment Engineering,Hohai University,Nanjing 210098,China;Power China Chengdu Engineering Corporation Limited,Chengdu 610072,China)

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,江苏南京210098 [2]中国电建集团成都勘测设计研究院有限公司,四川成都610072

出　　处：《岩土工程学报》2024年第12期2668-2674,共7页Chinese Journal of Geotechnical Engineering

基　　金：长江水科学研究联合基金重点支持项目(U2040221);华能集团总部科技项目(HNKJ20-H45);河海大学大型仪器设备共享基金项目(GX202205B)。

摘　　要：研制了一种适用于细粒土的新型叠片式单剪仪。该单剪仪试样室采用若干内部尺寸长×宽为100 mm×40 mm的回字形叠片,有效地减小了常规圆形叠环式单剪仪压力室剪切时试样侧倾、受力严重不均的问题。销钉式变形控制杆能使试样剪切变形均匀,叠片试样室外围的导向侧板控制了剪力的方向性,新型的杠杆支点结构有效解决杠杆倾斜时加载杆力传递变化的问题。该单剪仪结构稳定、易于操作,集应力/应变控制式功能于一身,可实现对细粒土的均匀剪切。基于该单剪仪对某黏土进行了抗剪强度和剪切蠕变试验,分析了黏土的抗剪强度参数和剪切蠕变规律,初步验证了该单剪仪的优良工作性能。A new simple shear apparatus is invented for fine grained soil based on the existing designs.Some rectangularstacked steel laminations are used for the new simple shear apparatus.The internal dimensions of the steel laminations are 100 mm in length and 40 mm in width.It effectively eliminates the common issues such as sample tilting and uneven stress distribution during shear testing compared to the conventional simple shear apparatuses.The pin type deformation control rod can ensure uniform shear deformation of the specimen.The guiding side plate around the specimen chamber controls the direction of the shear force.The new lever support structure effectively solves the problem of load rod force transmission because the lever is tilted.The simple shear apparatus is featured with stable structure and easy operation.It combines the stress/strain control functions into one unit,allowing for the uniform shear testing of fine-grained soils.The shear strength tests and shear creep tests on clay are carried out using the novel simple shear apparatus.Meanwhile,the parameters of shear strength and the laws of creep are analyzed.The test results validate the good performance of the novel simple shear apparatus.

关 键 词：单剪仪 应力/应变控制 均匀剪切 细粒土 蠕变试验 抗剪强度 

分 类 号：TU411[建筑科学—岩土工程]