铁路路堑边坡膨胀土的化学改良试验研究

研究目的：在路堑膨胀土边坡中，如何进行膨胀土的改良处理是岩土工程研究领域中的重要课题之一，亦是铁路工程建设中最突出的地质灾害之一。研究方法：本文结合某铁路膨胀土边坡防护试验工程，采用一种生态改性剂进行膨胀土化学改良试验研究，探讨膨胀土的化学改良机理及改良效果，对比分析膨胀土改良前后的物理力学性质及胀缩性，研究该路段膨胀土的改良方案。研究结果：用生态改性剂进行膨胀土的改良是可行的，改良处理后的膨胀土的颗粒组成、物理力学性质、胀缩特性均有明显的改善，力学强度及水稳定性得到提高。研究结论：改性土的工程性质得到了很大的改善；边坡土体改良深度在80-100cm左右，超过1m后，改良效果不理想，化学改良最佳喷洒次数为3～4次。

Experimental Research on the Meliorateing Treatment of Expansive Soil in Railway Chasm Slope

Research purposes: In the engineering of chasm slope,how to meliorate expansive soil is one of the important problems in the the field of expansive soil treatment,and is also one of the most prominent geologic disasters in the engineering construction of railway.Research methods: Combining with the experimental engineering of the improved expansive soil of chase slope with medicine in the railway test project,this paper discusses the mechanism and effectiveness of improving expansive soil,compared analyzes the physical and mechanical propertyes and swell-shrink characteristics of expansive soil fore and improved,and studies the improved scheme of expansive soil. Some availability conclusions are provided for the design and costruction of expansive soil slope.Research results:It is feasible to use medicine to meliorate the expansive soil.The granule composing,physical and mechanical propertyes and swell-shrink characteristics of expansive soil with meliorative medicine are obviously ameliorated.And the mechanical strength and water stabilization is also improved.Research conclusions:The enginerring character of expansive soil is ameliorated very much.The meliorating depth of the chasm slope is about 80 cm to 100 cm.If the depth is exceeded 1 m,the effeciveness of improving is not good and the optimal time of chemical melioration is 3 to 4 times.