冲击碾压法处理辽西湿陷性黄土路基的试验研究

Field Test Study on Collapsible Loess Subgrade Treatment by Impact-rolling Method in Liaoxi Area.

为了获得冲击碾压法处理湿陷性黄土路基的技术参数,对试验路段进行了冲击碾压试验。通过试验前后动力触探试验以及土的物理力学性质指标的对比,发现采用25kJ冲击式压路机冲击碾压60遍后,深度2.5m内黄土的物理力学性质发生了较大的改变,1.0m内的湿陷性得到了消除,干密度和动力触探击数可以作为冲击碾压法处治效果检验的有效指标。

In order to get the technical parameters of impact-rolling method to stabilize the collapsible loess, the test area is selected to use for impact-rolling tests. Comparison for dynamic penetration test in-situ and indexes of physical and mechanical characteristics of the loess before impact-rolling and after, it shows that the physical and mechanical characteristics of loess are changed largely in the depth of 2.5m, and the collapsibility of loess in the depth of 1.0m is eliminated, after impacted 60 times by percussion-type road roller with 251d. The index of dry density and parameter of dynamic penetration can be used for the effective indexes to check the effect of impact-rolling.