新建西宁南绕城高速公路砂砾改良盐渍土的性能研究

新建西宁南绕城高速公路盐渍土分布广泛,路基开挖数量巨大,弃方较多,设计考虑将部分盐渍土进行改良,以作为路基填料。通过对盐渍土和砂砾按不同的配合比进行物理改良研究,改变其级配,促进骨架结构的形成,同时间接减少其含盐量,提高其路用性能。研究结果表明:采用盐渍土∶砂砾为1∶1(体积比)时,其路用性能(回弹模量和承载比)都能满足规范和设计的要求。

Study on Performance of Saline Soil Improved by Gravel along South Xining Ring Expressway Newly Built

There is saline soil widely spread along South Xining Ring Expressway which is newly built with large quantity of excavation and much of digging soil; thus it is considered in the design that part of the saline soil is improved to be the subgrade filler. Through the studies on the saline soil improved by gravel in different proportions, the grading was changed to help the formation of skeleton structure and indirect reduction of the salt content so as to enhance the pavement performance. The study result shows that, when the ratio of saline soil to gravel is 1:1 (by volume), the pavement performance (resilient modulus and bearing ratio) may meet the requirements of the criterion and design.