不同加荷速率的双向土工格栅与黏土力学特性试验研究  

Test and research on the index of mechanical performance of biaxial geogrid and clay under different test speeds

作　　者：刘文白[1] 黄天荣[1] 

机构地区：[1]上海海事大学海洋环境与工程学院,上海200135

出　　处：《水运工程》2010年第6期5-8,共4页Port & Waterway Engineering

基　　金：上海市教育委员会科研项目(07ZZ99);上海海海事大学校级重点学科建设项目(A290209002);浙江省科技计划面上项目(2008C23023)

摘　　要：以粉质黏土为填料,以双向土工格栅为加筋材料,通过3种不同速率下的直剪与拉拔试验,对比分析了直剪与拉拔试验加筋黏土的力学性能指标特性,研究了加荷速率对力学性能指标的影响。结果表明:拉拔试验得到的力学性能指标比直剪试验低。随着加荷速率从0.53 mm/min→1.33 mm/min→2.67 mm/min的增加,直剪摩擦相应的cgs以4 kPa左右的增量变化,φgs以3°左右的增量变化。而试样的拉拨摩擦随着拉拔速度的增加,相应的cgs值以5 kPa左右的增量变化,φgs以-1°左右的增量变化。直剪试验随着加荷速率的增加,相应的cgs,φgs均增大。而试样的拉拨试验随着加荷速率的增加,相应的cgs值增大,φgs却减小。Based on the direct shear test and pull-out test of reinforced soil composed of silty clay and biaxial geogrid under three different test speeds,the comparative analysis of the index of mechanical performance of the reinforced clay in direct shear test and pull-out test is conducted,and the impact of the test speed on the index of mechanical performance is studied.It is found that the index cgs gained the increment of 4 kPa and φgs showed that the increment of 3° with the test speed is among 0.53 mm/min and 1.33 mm/min and 2.67 mm/min in the direct shear test,while the index cgs gained the increment of 5 kPa and φgs showed the increment of-1° in the pull-out test.Both the indices of cgs and φgs increased as the test speed increased in the direct shear test whereas the index of cgs increased but φgs decreased in the pull-out test.

关 键 词：直剪试验 拉拔试验 加荷速率 力学性能指标 

分 类 号：TU472.34[建筑科学—结构工程]