Abstract：Research purposes:Based on the basic principle of flat dilatometer test (DMT) ，the discussion was made on the way for deriving the coefficient of horizontal consolidation from DMTA dissipation test in theory． As the same time，combined with the DMTA tests done in Huzhou experimental section of Shangqiu －Hefei －Hangzhou Railway and the Changshou experimental section of Shanghai － Nantong Railway，the theory and method for obtaining the coefficient of horizontal consolidation from the DMTA dissipation data were analysed by examples．
Research conclusions:The results of the coefficient of horizontal consolidation were compared with CPTU dissipation tests data and laboratory odometer tests data． Comparisons of the results indicated that the coefficients of horizontal consolidation determined by DMTA tests and CPTU tests were very close． The correlation was good between the coefficient of horizontal consolidation determined by tests and CPTU tests in homogeneous soil，but it was poor in non－homogeneous soil．The coefficient of horizontal consolidation from laboratory odometer tests was smaller than those obtained by DMTA and CPTU test，and it was the same as that reported by other researchers．
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［9］ Marchetti S．，Monaco P． ，Totani G．＆ Calabrese M．The Flat Dilatometer Test ( DMT) in Soil Investiga－tions［C］/ / A Report by the ISSMGE CommitteeTC16．Proc．IN SITU 2001，Intnl．Conf．On In Situ Measurement of Soil Properties，Bali，Indonesia，2001．
2012, Vol. 29 
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