DMTC消散试验探求软黏土固结系数研究

Determination of consolidation coefficient for soft clay from DMTC dissipation tests

基于扁铲侧胀试验(DMT)的基本原理,简要地介绍了利用DMT的C值消散试验求解水平向固结系数的理论与方法。结合商丘—合肥—杭州(商合杭)铁路工程湖州试验段与上海—南通(沪通)铁路工程常熟试验段的DMTC消散试验进行了实例分析研究。结果表明:DMTC消散试验与孔压静探消散试验获取水平向固结系数较为接近,二者在均质土层中相关性较好,在非均质土层中相关性较差;与DMTC消散试验及孔压静探消散试验获取的水平向固结系数相比,室内试验获取的水平向固结系数明显偏小,与其他研究者的成果一致。

Based on the flat dilatometer test （DMT） theory, the method for deriving the coefficient of horizontal consolidation from DMTC dissipation tests is introduced. The DMTC test results of saturated soft clay ground in Shangqiu-Hefei-Hangzhou railway and Shanghai-Nantong railway are presented, and the coefficient of horizontal consolidation is obtained from the DMTC dissipation data. The results of the coefficient of horizontal consolidation are compared with CPTU dissipation test data and laboratory odometer test data. The comparison shows that the coefficients of horizontal consolidation determined by DMTC tests and CPTU tests are very close. The correlation is good for homogeneous soil, but bad for non-homogeneous soil. The coefficients of horizontal consolidation from laboratory odometer tests are smaller than those obtained by DMTC and CPTU tests, as reported by other researchers.