干湿循环作用下改良膨胀土力学指标的变化规律  

Study on the Models of Mechanics Indexes of Improved Expansive Soil and Wetting-drying Cycles

作　　者：董云[1] 张渊[1] 蒋洋[1] 刘宇翼[1,2] 

机构地区：[1]淮阴工学院土木工程实验室,江苏淮安223001 [2]中国矿业大学,江苏徐州221116

出　　处：《公路工程》2015年第4期41-46,共6页Highway Engineering

基　　金：江苏省高校自然科学基金项目(10KJB170002);江苏省交通运输厅公路科技计划项目资助(SJGJ201307)

摘　　要：为探索改良膨胀土力学指标随干湿循环作用的变化规律,根据膨胀土改良及击实试验成果,进行了干湿循环作用不同次数后的直接剪切、固结试验及CBR强度试验。试验结果表明:干湿循环作用造成的试样表面松散,导致了改良膨胀土力学指标的快速下降,但经历多次干湿循环,试样表面的松散程度及深度并未显著增加,改良膨胀土的力学指标随干湿循环作用次数增加趋于稳定。To discover variation rules of the mechanics indexes of improved expansive soil and d wetting-drying cycles,direct shear tests,consolidation tests and CBR tests were carried out after different times wetting-drying cycles based on the results of lab compaction and improvement test. The results show that the mechanics indexes decreased sharply after first 3 times cycles for the looseness of sample surface caused by the wetting-drying cycles,but they trended to a stable value after several times cycle for more times cycle did not have significant effects on the depth and degree of the surface looseness. The rules of mechanics indexes of improved expansive soil and wetting-drying cycles were put forward based on the analysis of the experimental data.

关 键 词：改良膨胀土 干湿循环 抗剪强度 压缩系数 CBR 

分 类 号：TU471.91[建筑科学—结构工程]