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本文简要分析了三种扁铲侧胀消散试验方法 (DMTC、DMTA及DMTA2)获取软黏土水平固结系数的原理,并介绍了其获取固结系数的方法过程。在某铁路工程湖州试验段开展了三种扁铲侧胀消散试验,同时,还开展了孔压静探消散试验、应力铲消散试验和室内固结试验等对比试验。对比测试结果表明:在饱和软黏土中,三种扁铲侧胀消散试验与孔压静探消散试验获取的水平固结系数较为接近,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;通过与孔压静探消散试验、应力铲消散试验及室内固结试验获取的水平固结系数相关性的对比可知,DMTA、DMTC消散试验优于DMTA2消散试验;与扁铲侧胀消散试验及孔压静探消散试验等获取的水平固结系数相比,室内试验获取的水平固结系数明显偏小,这与其他研究者的成果一致。
This paper briefly analyzes the principle of obtaining the horizontal consolidation coefficient of soft clay by three methods of dilatometer dissipation test (DMTC, DMTA and DMTA2) and introduces the process of obtaining the consolidation coefficient. In the Huzhou pilot section of a railway project, three kinds of flat shovel dissipation tests have been carried out. At the same time, comparative experiments such as pore pressure static dissipative test, stress shovel dissipation test and indoor consolidation test have also been carried out. The results of comparison test show that in the saturated soft clay, the horizontal consolidation coefficient obtained by the three kinds of flat dilatometer dissipation experiment and the pore pressure static dissipative test are relatively close, and the correlation between the two is very good in the homogeneous soil layer. Homogeneity of the soil layer is poorly correlated. Compared with the static pressure dissipation test, the stress shovel dissipation test and the horizontal consolidation coefficient correlation obtained by the indoor consolidation test, the DMTA and DMTC dissipation test is better than the DMTA2 dissipation test Compared with the horizontal consolidation coefficient obtained by the flat dilatancy dissipation experiment and the pore pressure static dispersion test, the horizontal consolidation coefficient obtained by the laboratory experiment is obviously smaller, which is consistent with the results of other researchers.