盐渍土溶陷特性的试验研究与分析

本文以新疆（北疆）地区S201线克拉玛依至榆树沟段公路沿线的盐渍土为研究对象，着重对该土的溶陷特性进行了试验研究，目的是为新疆的公路设计和施工提供合理的技术指导。运用单轴压缩试验，通过利用单、双线法试验结果的对比分析，总结出了盐渍土的溶陷变形随含水量和压力变化的规律及特点。研究认为：对于不同类型的盐渍土，不论采用何种试验方法，都会得到溶陷系数、峰值溶陷压力随含水量增大而减小，氯盐盐渍土峰值溶陷压力在400—500kPa附近，而硫酸盐盐渍土峰值溶陷压力在200kPa附近；同时还得出不同类型的盐渍土对水的敏感程度相同，即试验开始与结束表现为敏感弱，而中间阶段表现较强；从试验方法符合实际情况以及结果准确入手，双线法比单线法更适合于对盐渍土溶陷性的试验研究。

Experimental Study and Analysis of Saline Soil' s Collapsibility

This paper regarded Xinjiang(Beijiang) saline soil in the road of Kalamayi to Yushugou as the research object, maked a better systemic analysis and research in saline soil collapsibility, aiming to provide many reasonable technical parameters for designation and construction in Xinjiang's roads. Monaxial compression test was used in the paper, both single-track method and bilinear method were used to contrastively analyze in the test. Through analyzing the experimental results from the tests, it summarized the regularity and feature of collapsing deformation change with the degree of saturation. A conclusion was drawn that coefficient and peak value of melt sinking were reduced with water content increasing no matter what type of saline was adopted, the peak value of chlorine' s melt sinking stress is near by 400 kPa～500 kPa, but to sulfate saline soil, the value is around 200 kPa, at the same time, the paper had a judgment that different saline soil have the same sensitivity to water, that it is weak in the early and end stages, but strong in the intermediate stage. Bilinear method is better than single-track method in the testing application and precision.