论文部分内容阅读
随着人工冻结法在地铁建设中的广泛应用,控制工后融沉已成为软弱地层冻结需要解决的难题.以苏州地铁典型软弱土层为研究对象,通过室内试验研究,得出不同补水条件下原状土开放融沉系数大于封闭融沉系数;融前卸载加压方式下,融沉系数随上部荷载增大呈指数型减小;无黏性重塑土融沉系数与原状土接近,黏性土重塑后融沉系数变大,其差值随该土灵敏度增大而增大;对于非饱和黏土和淤泥质粉质黏土,开放冻融条件下融沉系数与干密度变化关系均存在临界干密度,对应土体融沉系数最小.
With the extensive application of artificial freezing method in subway construction, controlling the post-industrial thaw settlement has become a difficult problem to be solved in freezing stratum.Taking the typical soft soil of Suzhou Subway as the research object, through indoor test and study, The open thawing settlement coefficient of undisturbed soil was larger than the closed thawing settlement coefficient. Under the unloading and pressurization mode, the melting and thawing coefficient decreased exponentially with the increase of the upper load. The melting and sedimentation coefficient of the non- After thawing, the sedimentation coefficient becomes larger, and the difference increases with the sensitivity of the soil. For the unsaturated clay and silty silty clay, there is a critical relationship between the melt-sedimentation coefficient and dry density under the open-thaw condition Dry density, corresponding to the smallest thaw sinking coefficient.