粉砂土及其加筋土大三轴剪切试验及结果分析

On soil and polymer geogrid reinforced soil by large-scale triaxial

加筋复合体中 ,土工格栅的作用相当于给土体施加等效围压 .在有限元计算中 ,可以用等效围压代替格栅的作用 ,加在土单元上 ,模拟筋材本身的单元并不出现 .等效围压值的大小取决于筋材的变形 .通过试验分析表明 ,当周围压力较大时 ,筋土同步变形 ,等效围压值容易确定 ,而周围压力小时 ,筋土不能同步变形 ,等效围压值难以确定 .在有限元计算中 。

The role of polymer geogrid in composite reforced-soil is considered as an equivalent additional compress stress applied to the soil skeleton. The equivalent additional compress stress can be used in FEM calculation in place of polymer geogrid. The value of the equivalent additional compress stress is decided by the deformation of geogrid. It is showed by experiment that if round compress were large, geogrid would deform in same pace with soil and the value of The equivalent additional compress stress is easy to be decided. On the other hand, if round compress were small, geogrid couldn't deform in same pace with soil and he value of the equivalent additional compress stress is difficult to be decided. This problem should be considered in FEM.