格室加筋土等效强度计算方法对比研究  

Comparative study on equivalent strength calculation methods of geocell reinforced soil

作　　者：付娆 宋飞[1] FU Rao;SONG Fei(Highway Institute,Change University,Xisan 710064,China)

机构地区：[1]长安大学公路学院,陕西西安710064

出　　处：《地基处理》2021年第3期188-194,共7页Journal of Ground Improvement

基　　金：陕西省自然科学基金项目(2019JM-100)。

摘　　要：本文通过对比基于填料内摩擦角以及基于填料应力-应变关系两种计算土工格室复合材料等效强度的方法,研究表观黏聚力与填土邓肯-张模型非线性弹性常数以及土工格室刚度参数之间的关系,分析两种方法的差别,得到如下结论:对于砂砾料,基于填料内摩擦角计算方法仅能反映内摩擦角对于表观黏聚力的影响,无法反映非线性弹性常数对于黏聚力的影响,当填土的内摩擦角一定时,用基于填料应力-应变关系的方法计算的表观黏聚力与参数k成负相关,与破坏比成正相关;用两种方法计算出的表观黏聚力都与土工格室切线模量正相关,与网格尺寸负相关。用基于填料应力-应变关系的方法计算时,试验常数k越小,破坏比越大,改变土工格室切线模量和试样最初直径对表观黏聚力的影响越大。In this paper,the two methods of calculating the equivalent strength of geocell composite materials based on the internal friction angle of filler and the stress-strain relationship of filler are compared.The relationship between the apparent cohesion and the nonlinear elastic constants of Duncan Chang model and the stiffiiess parameters of geocell is studied,and the differences between the two methods are analyzed.The results showed that the calculation method can only reflect the influence of internal friction angle on the apparent cohesion,but cannot reflect the influence of nonlinear elastic constant on the cohesion.When the internal friction angle of the fill is fixed,the apparent cohesion calculated by the method based on the stress-strain relationship of the fill is negatively correlated with the parameter k,and positively correlated with the failure ratio.The apparent cohesion calculated by the two methods is positively correlated with the tangential modulus of the geocell and negatively correlated with the mesh size.The modulus is positively correlated with the mesh size and negatively correlated with the mesh size.The smaller the test constant k is,the larger the failure ratio is.The larger the effect of changing the tangent modulus of geocell and the initial diameter of specimen on the apparent cohesion is.

关 键 词：土工格室 等效强度计算方法 非线性弹性常数 内摩擦角 格室刚度 

分 类 号：TU470[建筑科学—结构工程]