中主应力对加筋黄土强度影响的试验研究  

Experimental Research on the Effect of Intermediate Principal Stress on the Strength of Reinforced Loess

作　　者：李雪江[1] 骆亚生[1] 谭东岳[1] 吴小平[1] 

机构地区：[1]西北农林科技大学水利与建筑工程学院,陕西杨凌712100

出　　处：《中国农村水利水电》2010年第12期94-96,共3页China Rural Water and Hydropower

基　　金：国家自然科学基金资助项目(50578134);教育部新世纪优秀人才支持计划(NECT-06-0864)

摘　　要：针对加筋计算中很少考虑中主应力影响的现状,通过真三轴试验研究了中主应力对加筋土强度的影响。研究结果表明:中主应力对加筋土强度影响明显,在加筋层数一定时,加筋土强度随中主应力系数的增大,整体上呈现增大趋势;在中主应力比一定,b值较小时加筋土强度随加筋层数的增加呈现增大趋势,b值较大时随加筋层数的增大而减小;并分析了中主应力比对强度指标的影响。中主应力对加筋土强度特别是横向加筋时影响非常大,设计加筋时不应忽略中主应力影响。Targeted at reinforcement design rarely considered the effect of intermediate principal stress,the true triaxial test is taken to study the effect of intermediate principal stress on the strength of reinforced loess in this paper.The results show that intermediate principal stress has a significant influence on the strength of reinforced loess,and the strength of reinforced loess has a increasing trend in the whole with the increase of coefficient of intermediate principal stress.For a given ratio of the intermediate principal stress,as the value of b is small,the strength of reinforced loess tends to increase as the reinforced layers increase,but as the value of b becomes bigger,it shows a contrary tendency,and analyzes the influence of intermediate principal stress on the strength index.Intermediate principal stress has a great influence on the strength of reinforced loess especially when taking the transversal reinforcement,so the effect of intermediate principal stress can not be disregarded during the reinforcement design.

关 键 词：加筋黄土 真三轴 中主应力 加筋层数 

分 类 号：TU411[建筑科学—岩土工程]