不同环境对水泥土动应力影响的试验研究  

Experimental Study on Dynamic Stress of Cement Soil under Different Environments

作　　者：陈四利[1] 魏星[2] 宁宝宽[1] 

机构地区：[1]沈阳工业大学建筑与土木工程学院,辽宁沈阳110870 [2]江西工业工程职业技术学院,江西萍乡337000

出　　处：《地震工程学报》2016年第6期847-853,共7页China Earthquake Engineering Journal

基　　金：国家自然科学基金资助项目(51279109)

摘　　要：为研究腐蚀性介质和动荷载对水泥土力学特性的影响,通过水泥土的动三轴压缩试验,获取水泥土动应力试验参数,分析各种环境对水泥土动强度的影响。试验结果表明,当硫酸钠溶液浓度小于0.03mol/L时水泥土的动强度逐步增大,当硫酸钠溶液浓度大于0.03mol/L时水泥土的动强度又逐步降低;随着氯化钠溶液浓度的增大,其动强度逐步降低;随着腐蚀时间的增加,0.03mol/L硫酸钠溶液的水泥土动强度逐步增大,而0.1 mol/L和0.3 mol/L硫酸钠溶液的水泥土动强度均逐步降低;水泥掺入比和围压越大,水泥土动强度越大;当溶液浓度小于0.03mol/L时硫酸钠环境对水泥土的动强度有增强效应,且浓度大于0.03mol/L时硫酸钠环境对水泥土具有腐蚀破坏效应,且硫酸钠溶液腐蚀效应大于氯化钠溶液腐蚀效应。Dynamic triaxial compression tests are conducted to study the effects of corrosive media and dynamic loads on the mechanical properties of cement soil.The experimental parameters of dynamic stress are obtained,and the effects of the dynamic strength of the cement soil are analyzed in different environments.Results show a gradual increase in the dynamic strength of the cement soil with an increase in the concentration of sodium sulfate corrosion solution when it is less than 0.03mol/L.However,when the concentration is greater than 0.03 mol/L,there is a gradual decrease in the dynamic strength of the cement soil.In addition,there is a gradual decrease in the dynamic strength of cement soil with an increase in the concentration of sodium chloride solution.Furthermore,there is a gradual increase in the dynamic strength of cement soil in 0.03mol/L of sodium sulfate solution with an extension of corrosion time.Results show the following:when the concentration of sodium sulfate solution is between 0.1~0.3mol/L,there is a gradual decrease in the dynamic strength of the cement soil.Moreover,when the cemented content is at a greater ratio,the stronger dynamic strength of cement soil is greater.Furthermore,when the confining pressure is greater,the dynamic strength of cement soil is stronger.In addition,when the solution concentration is less than 0.03mol/L,the dynamic strength of cement soil is enhanced in a sodium sulfate environment,but when it is greater than 0.03mol/L,the cement soil is corroded and damaged within the same environment and the corrosion effect is greater than that of the sodium chloride solution.

关 键 词：水泥土 动三轴压缩试验 动应力 腐蚀环境 水泥掺入比 围压 

分 类 号：TU411[建筑科学—岩土工程]