超氯盐渍土在雅丹地貌铁路沿线固沙试验研究
Sand-fixation experimental research of chlorine saline soil in Yardang landform along the railway

以雅丹地貌新建铁路为例，研究当地超氯盐渍土在铁路沿线固沙中的应用。通过室内土工试验和微观分析结合的方法，研究超氯盐渍土的氯离子含量、含水率、液塑限、养护温度和抗压强度的关系。研究结果表明：随氯离子含量和含水率的提高，单键键能増大，单位体积键量减少，总键能减小，导致试件的抗压强度降低；抗压强度与最佳含水率之间呈抛物线关系。加温养护后，试件孔隙率增大，抗压强度降低。对于氯离子含量超过40%的盐渍土，不但要考虑毛细现象的影响，而且需采用固化剂对氯盐进行处理。研究结果对雅丹地貌新建铁路沿线的绿色固沙有所裨益。
Taking a newly-built railway in Yardang landform as an example, the application of the local super chlorine saline soil in sand-fixation along the railway area was studied. By means of consolidation test and microcosmic evaluation method, we studied the relationship between compressive strength and chlorine ion content, moisture content, liquid plastic limit, curing temperature of chlorine saline soil. It turns out that with the increase of the chloride ion content and porosity, the single-bond energy is greater, and the compressive strength of the specimens is lower, and sand properties is more obvious. In addition, there is a nonparabolic relationship between the moisture content and the chloride ion content. After heat curing, samples have larger porosity and smaller compressive strength. The saline soil whose chloride ion content is more than 40%, not only should consider the effect of capillarity, but need to deal saline soil with the other curing agent. The results are beneficial to the green sand-fixation in yardang landform along the newly-built railway