冻融循环下膨胀土抗剪强度的双因素数值方差分析  

Two factor analysis of variance of shear strength of expansive soil under freeze-thaw cycle

作　　者：蒋晓庆[1] 张珂[1] 董克[1] 姚志刚[1] 

机构地区：[1]安徽广播电视大学开放教育学院,安徽合肥230022

出　　处：《河南城建学院学报》2017年第5期22-27,共6页Journal of Henan University of Urban Construction

基　　金：安徽省高校自然研究重点项目(KJ2017A944);安徽省高校自然研究重点项目(KJ2016A112);安徽省教育厅质量工程土木工程专业综合改革试点(2014zy139)

摘　　要：考虑到土样的典型性和代表性,选取两组物理力学性质有差异的膨胀土土样进行室内试验。通过室内直剪试验,研究冻融循环和竖向压力对膨胀土抗剪强度的影响。结果表明:随着冻融循环次数的增加,膨胀土的抗剪强度会增大,但是增幅越来越小;随着竖向压力的增加,膨胀土的抗剪强度也呈增大趋势。为了量化冻融循环次数、竖向压力以及两者的交互效应对膨胀土抗剪强度的影响程度,采用双因素数值方差分析。结果表明:冻融循环次数和竖向压力对膨胀土的抗剪强度影响显著,冻融循环次数和竖向压力的交互效应影响不显著;根据F值大小得出竖向压力对膨胀土抗剪强度影响最显著,其次是冻融循环次数。Considering typical and representative of soil samples, two groups of expansive soil samples with differentphysical and mechanical properties were selected for indoor test. The effect of freeze-thaw cycle and verticalpressure on shear strength of expansive soil was studied through the indoor direct shear test. The resultsshow that the shear strength of expansive soil increases with the increase of the number of freezing and thawingcycles, but the increase is smaller, and the shear strength of expansive soil increases with the increase of verticalpressure. In order to quantify the effect of the number of freeze-thaw cycles, vertical pressure and their interactionon the shear strength of expansive soil, two-factor numerical variance analysis was used. The resultsshow that ： the effect of freezing-thawing cycle times and vertical pressure on the shear strength of expansivesoil is remarkable, and the interaction effect between the number of freezing and thawing cycles and verticalpressure is not significant, and the vertical pressure has the most notable effect on the shear strength of expansivesoil, followed by the number of freeze-thaw cycles.

关 键 词：膨账土 冻融循环 抗剪强度 竖向压力 双因素方差分析 显著性 

分 类 号：TU411[建筑科学—岩土工程]