提高膨胀土力学性能的可持续发展途径研究

A Sustainable Approach to Improve Mechanical Properties of Expansive Soils

该研究将阿德莱德当地的天然土作为实验对象,加入橡胶粉沫和石灰粉作为添加剂,来探究不同的化学添加剂对膨胀土力学性能的影响。首先通过粒度分析试验研究了阿德莱德地区天然土壤的颗粒分布,并对土壤样品进行了阿太堡限度试验,测定了土壤样品的液限,塑性极限,和线性收缩率。然后进行了标准普氏击实实验(Standard Proctor Compaction test,SPC)、无侧限抗压强度实验(Unconfined Compressive Strength test,UCS),研究了添加剂对土壤性质的影响。实验结果表明在土中添加外加剂可以改善土的性质,反映在土的抗剪强度、含水量、干密度等参数上的变化。对照试验选取了0%、5%、10%的橡胶和0%、2.5%和5%的石灰粉研究了橡胶与石灰的不同配比对膨胀土力学性能的影响。试验结果表明,橡胶和石灰粉对阿德莱德地区膨胀土具有很强的稳定作用,5%橡胶、5%石灰,是提升膨胀土性能的最佳掺量.

In this study,local natural soil in Adelaide was used as the experimental object,additives such as rubber powder and lime powder were added to explore the effects of different chemical additives on the mechanical properties of expansive soil.Firstly,the particle size distribution of natural soil in Adelaide was studied by particle size analysis test,and the Atterberg Limit test was performed on soil samples to determine the liquid limit,plastic limit,and linear shrinkage of the soil samples.Then,the Standard Proctor Compaction test(SPC)and the Unconfined Compressive Strength test(UCS)were carried out to evaluate the influence of additives on soil properties.The experimental results show that adding additives to the soil can improve the properties of the soil,which is reflected in the changes of the soil’s shear strength,water content,dry density and other parameters.The control experiments selected 0%,5%,10%rubber and 0%,2.5%and 5%lime powder to study the influence of different ratios of rubber and lime on the mechanical properties of expansive soil.The test results show that rubber and lime powder have a strong stabilizing effect on the expansive soil in Adelaide and 5%rubber and 5%lime are the optimal percentage to improve the performance of expansive soil.