扁铲侧胀消散试验获取固结系数的对比试验研究  

Comparative experimental study on consolidation coefficients obtained from DMT dissipation tests

作　　者：孟长江[1] 熊大生[1] 涂启柱[1] 

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063

出　　处：《工程勘察》2015年第5期23-29,共7页Geotechnical Investigation & Surveying

摘　　要：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。The theory on getting the coefficients of horizontal consolidation in saturated soft clay from the three flat dilatometer dissipation tests( DMTC,DMTA and DMTA2) are briefly analyzed,and the method processing of the three flat dilatometer dissipation tests are introduced. The flat dilatometer dissipation tests,CPTU dissipation tests,stress spade dissipation tests and laboratory consolidation tests are carried out in railway engineering test section in Huzhou. The results of the coefficients of horizontal consolidation from DMT are compared with the data from the CPTU dissipation tests,stress spade dissipation tests and laboratory consolidation tests. The comparison results indicate that the coefficients of horizontal consolidation determined by the DMTC,DMTA and DMTA2 dissipation tests and CPTU dissipation tests are very close. The correlation is good between the coefficient of horizontal consolidation determined by DMT dissipation tests and CPTU dissipation tests in homogeneous soil,but it is poor in non-homogeneous soil.Compared with CPTU dissipation tests,stress spade dissipation tests and laboratory consolidation tests,DMTA and DMTC dissipation tests are better than DMTA2 dissipation tests. The coefficients of horizontal consolidation from laboratory consolidation tests are smaller than those obtained by DMTC,DMTA and DMTA2 dissipation tests and CPTU tests,as reported by other researchers.

关 键 词：扁铲侧胀消散试验 水平固结系数 铁路工程 对比试验 

分 类 号：TU411[建筑科学—岩土工程]