武广客运专线红粘土地基固结变形特性研究

客运专线对地基变形要求非常严格,需要对红粘土地基的固结变形进行深入研究。选取一线路横断面并在不同深度埋设了3个单点沉降计,监测红粘土地基不同深度的沉降,在监测断面附近不同深度钻孔取样,进行室内固结及膨胀性实验,根据现场监测数据和室内试验结果,研究了红粘土地基的变形特性。研究表明:红粘土从表层到底层压缩性逐渐增大;中层土体的回弹性、粘滞性均比上下层大;红粘土的膨胀性对地基的变形规律影响较大,修建在红粘土地基上的客运专线路基必须有足够的换填高度,以抵制地基的膨胀压力;在修筑上部结构前应放置足够长的时间,使地基土体内部应力或变形能够充分调整完成,从而减少工后变形。

Study on consolidation deformation characteristics of red clay foundation along Wuhan-Guangzhou Passenger Line

Passenger Transport line has strict requirement about foundation deformation,so the law of red clay foundation consolidation deformation needs to be further researched.Embed three single-point settlement sensors at different depths to measure amount of deformation,combined with consolidation and swell-shrinking test result,system analysis of red clay foundation deformation characteristics has been conducted.Research results indicate that the compressibility increases with depth increasingly;the capability o...