级配对粗颗粒硫酸盐渍土溶陷特性的影响

Influence of Gradation on Subsidence Characteristic of Coarse Particle Sulphate Soil

研究目的:随着高速铁路在盐渍土地区的不断发展,盐渍土的溶陷特性导致的高铁路基沉降问题越来越突出。为解决高速铁路在盐渍土地区由溶陷特性导致的路基沉降问题,本文将级配类型作为粗颗粒盐渍土溶陷特性的主要影响因素进行精细化分析,探究级配类型对粗颗粒硫酸盐渍土溶陷特性的影响。研究结论:(1)在硫酸钠含量相同的情况下,级配类型中粗颗粒的占比增大时,粗颗粒的骨架作用会抑制溶陷的发生,溶陷量会随之减小,在0.1%的低硫酸钠含量情况下抑制作用最明显,粗颗粒级配比细颗粒级配的溶陷系数减少了68.57%;(2)粗颗粒盐渍土的溶陷量随着硫酸钠含量的增加而增大,硫酸钠含量每增加1%,五种典型级配的溶陷系数平均增加0.01;(3)随着硫酸钠含量的增大,硫酸钠对粗颗粒盐渍土溶陷特性的影响程度减小;(4)本研究成果可为粗颗粒盐渍土地区高速铁路地基处置及路基设计提供依据和参考。

Research purposes:With the continuous development of high speed railway in saline land area,the settlement of high railway foundation caused by the dissolution of saline soil becomes more and more serious.To solve the embankment settlement problem of high speed railway in saline soil area caused by subsidence characteristics,this paper analyzes the main influencing factors of subsidence characteristics of coarse particle saline soil,and explores the influence of gradation type on the subsidence characteristics of coarse particle soluble soil.Research conclusions:(1) In the case of the same sodium sulfate content,the proportion of coarse particle in grading type increases,the skeleton effect of coarse particles can inhibit the occurrence of collapse,the subsidence quantity will decrease.The inhibition effect is most obvious in the case of 0.1% sodium sulfate content,the subsidence coefficient of coarse particle gradation decreased by 68.57% compared to fine particle gradation.(2) The subsidence quantity of coarse particle saline soil increases with the increase of sodium sulfate content.For every 1% increase of sodium sulfate content,the melt-sinking coefficient of five typical gradations increases by 0.01 on average.(3) With the increase of sodium sulfate,the effect of sodium sulfate on the melt sinking characteristics decreases.(4) The research results can provide the basis and reference for the treatment foundation and roadbed design of high-speed railway in the area of coarse saline soil.