干湿循环下膨胀土应力-应变行为及强度分析  

Stress-strain behavior and strength study of expansive soil under dry-wet cycles

作　　者：舒志乐 孙启明[1] 廖智伟 张鑫 SHU Zhile;SUN Qiming;LIAO Zhiwei;ZHANG Xing(School of Civil Engineering Architecture and Environment, Xihua University, Chengdu 610039, China;School of Emergency Science, Xihua University, Chengdu 610039, China;The Fifth Engineering Company of CREGC, Chengdu 610091, China)

机构地区：[1]西华大学土木建筑与环境学院,成都610039 [2]西华大学应急学院,成都610039 [3]中铁二局第五工程有限公司,成都610091

出　　处：《中国科技论文》2021年第8期825-829,835,共6页China Sciencepaper

基　　金：教育部春晖计划项目(192641)。

摘　　要：为了探究降雨-蒸发作用对膨胀土强度特性的影响,以石家庄市灵寿县中等重塑膨胀土为试验对象,在各级围压和不同干湿循环次数下进行三轴固结不排水试验。分析了不同干湿循环次数、不同围压对膨胀土应力-应变和抗剪强度的影响,通过引入硬化曲线,构建了2种考虑干湿循环次数的应力-应变关系表达式,并对其合理性进行检验。结果表明,2种应力-应变表达式获取的曲线与实测值均能较好地吻合,从硬化曲线的割线模量出发构建的表达式比从参数出发构建的表达式的计算值稍大,可为为同类膨胀土在实际工程中的应用提供了理论参考。In order to explore the influence of rainfall evaporation on the strength characteristics of expansive soil,a triaxial consolidated undrained test was carried out on the moderately remolded expansive soil in Lingshou county of shijiazhuang city under different confining pressures and dry-wet cycles.The effects of different dry-wet cycles and confining pressures on the stress-strain and shear strength of expansive soils were analyzed.By introducing the hardening curve,two stress-strain relationship expressions considering the dry-wet cycles were constructed and carried out with reasonability test.The results show that the curves obtained by the two stress-strain expressions are in good agreement with the measured values.The expressions constructed from the secant modulus of the hardening curve are slightly larger than those calculated from the parameters,which provides theoretical reference for the application of similar expansive soils in actual engineering.

关 键 词：干湿循环次数 围压 膨胀土 抗剪强度 应力-应变 

分 类 号：TU443[建筑科学—岩土工程]