初始主应力方向对钙质砂动力特性影响的试验研究  

Experimental research on effect of initial principal stress orientation on dynamic properties of calcareous sand

作　　者：李建国[1] 汪稔[1] 虞海珍[2] 何杨[3] 许成顺[3] 

机构地区：[1]中国科学院岩土力学重点实验室,武汉430071 [2]华中科技大学土木工程学院,武汉430074 [3]大连理工大学土木水利学院,大连116024

出　　处：《岩土力学》2005年第5期723-727,共5页Rock and Soil Mechanics

基　　金：国家自然科学基金资助项目(No.40272121);科技部"十.五"南沙群岛及其邻近海区综合调查项目(No.7001DIA50041)资助。

摘　　要：利用大连理工大学的土工静力-动力液压三轴-扭转动多能剪切仪对相对密度为30%的钙质砂进行了扭转和竖向循环耦合试验,探讨了初始主应力方向角α0对钙质砂动强度和残余应变发展的影响。试验结果表明:α0对钙质砂的动强度、残余应变发展的影响非常明显,随着α0的增大,钙质砂的动强度显著减小,而残余应变的发展速度则明显加快。In order to investigate the effect of the initial angle of principal stress α0 on dynamic strength and residual strain behaviors of calcareous sand under cyclic loading, a series of triaxial-and-torsional coupling cyclic shear tests on calcareous sand with a relative density of 30% were carried out in a new universal triaxial and torsional shear apparatus of Dalian University of Technology. The test results show that the effect is marked. With the increasing of α0, the dynamic strength of calcareous sand decreases obviously and the rising rate of residual strain increases.

关 键 词：初始主应力方向 动强度 残余应变 三轴扭转多功能剪切仪 扭转和竖向循环耦合剪切试验 钙质砂 

分 类 号：TU411[建筑科学—岩土工程]