空心圆柱扭剪仪的改进及应用  

Improvements and application of hollow cylinder torsional shear apparatus

作　　者：孙田[1] 陈国兴[1] 朱定华[1] 

机构地区：[1]南京工业大学江苏省土木工程防震技术研究中心岩土工程研究所,江苏南京210009

出　　处：《南京工业大学学报（自然科学版）》2014年第1期53-59,共7页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：国家自然科学基金(41172258);教育部高等学校博士学科点专项科研基金(20113221110009);江苏省高校研究生科研创新计划(CXZZ11_0345)

摘　　要：英国GDS公司的中型空心圆柱扭剪仪动力加载功能强,测试精度高,但其研究对象仅限于砂土和黏性土。为开展砂砾土动力特性试验,对扭剪仪进行改进:用实心不锈钢板置换扭剪仪底座中铜芯透水石,得到实心底座,适合扭剪仪试验的土样中最大颗粒粒径由2 mm增大至10 mm。对改进后扭剪仪开展了性能验证试验,结果表明:改进后的实心底座与工作室底座接触较好,在应力控制和应变控制条件下,输出波形完整,幅值稳定,孔压计、轴向位移计等传感器都发挥其功能且测试结果正常,可完成砂砾土动力特性试验。To test the dynamic characteristics of gravels,improvements were made to the medium-sized hollow cylindrical torsional shear apparatus provided by GDS Instruments Ltd., United Kingdom, but is was only suitable for sand and cohesive soil.A solid base was made with solid stainless steel plate to replace the orig/nal copper core permeable stone so that the largest size of grain samples increased from 2 mm to 10 mm, therefore it was possible to test the dynamic characteristics of gravel soil.Performance verification tests were made to the improved torsional shear apparatus.It was shown that the improved solid base matched well with studio base;output waveforms with steady amplitude were complete under both stress and strain control con- ditions;and sensors, such as piezometer and axial displacement meter worked well, and normal results were achieved.The dynamic characteristic test for gravel soil was performed.

关 键 词：空心圆柱扭剪仪 改进 动力特性试验 砂砾土 

分 类 号：TU415[建筑科学—岩土工程]