不同环境下水泥土动弹性模量的试验研究

Experimental study on dynamic elastic modulus of cemented soil in different environment

为了研究动力荷载以及地下腐蚀性介质环境对水泥土力学特性的影响,通过水泥土的动三轴压缩试验,获取了不同环境下水泥土的动弹性模量参数,分析了不同环境对水泥土动弹性模量影响的关系曲线。试验结果表明,随着硫酸钠腐蚀溶液浓度的增大,水泥土的动弹性模量逐步增大,当浓度≈0.03 mol/L时,水泥土的动弹性模量开始逐步降低;随着腐蚀时间的增加,当硫酸钠溶液浓度较小(<0.03 mol/L)时,水泥土的动弹性模量逐步增大;当硫酸钠溶液浓度较大(>0.03 mol/L)时,水泥土的动弹性模量逐步降低;当溶液浓度较小(<0.03 mol/L)时,硫酸钠环境对水泥土的动弹性模量具有增强效应。而浓度较大(>0.03 mol/L)时,硫酸钠溶液和氯化钠溶液对水泥土均产生腐蚀破坏效应,且硫酸钠溶液腐蚀效应大于氯化钠溶液腐蚀效应;水泥掺入比越大,其动弹性模量越大;围压越大,水泥土的动弹性模量越大。

In order to study the effect of dynamic load and underground corrosive medium environment on the mechanical properties of cemented soil,dynamic triaxial compression tests were carried out to obtain the dynamic elastic modulus of cemented soil in different environment. The influence of different environment on the dynamic elastic modulus of cemented soil was analyzed. The results show that the dynamic elastic modulus of cemented soil increases gradually with the increase of the concentration of sodium sulfate corrosion solution. When the concentration reaches about 0. 03 mol / l,the dynamic elastic modulus of cemented soil begins to decrease gradually. When the concentration of sodium sulfate solution is small（ less than 0. 03 mol / l）,the dynamic elastic modulus of cemented soil increases gradually. When the concentration of solution is large（ more than 0. 03 mol / l）,the sodium sulfate solution and sodium chloride solution may bring about the corrosion and damage of cemented soil. And the corrosion effect of the sodium sulfate solution is more than the sodium chloride solution. The dynamic elastic modulus of cemented soil increases gradually with the increase of the cement content and the confining pressure.