Study On Engineering Characteristics And Disaster Causing Mechanism Of Soft Soil In Chongqing Area

In southwest China,especially in chongqing region due to its unique topography and geomorphology characteristics,make local over-wet soil presents a scattered areas widely characteristics,also makes the main physical and mechanical parameters may be different from other regions.So in order to avoid"on e size fits all"phenomenon appears on the project,especially for high-speed passing through analyzing wet earth road in chongqing,the main contents are as follows:（1）To bid DFWSJ1 highway over-wet soil road test and extensively collected in chongqing downtown district highway geological survey and exploration data,a total of 2908 sets of data;Secondly on the basis of soil mechanics and the geotechnical engineerin g specification of weak soil classification name,get low liquid limit clay,1109 group,713 group of clay,silty clay 489 groups,316 groups of high liquid limit clay,silt soil,238group,and less sludge and low liquid limit silt;Partition pool at the same time,the soil samples,the main distribution area of all kinds of soil;（2）Respectively,of low liquid limit clay,low liquid limit silt,high liquid limit clay,silt,silty clay and clay soil and the main physical parameters of mud（e,ρ,ω,ω,ω,,,etc.）,the main mechanical parameters((6,,(8,,etc.)and main physical indexes and through analyzing the correlation between mechanical indexes,it is concluded that the correlation equation,and provide reference for related staff;（3）Summary encountered in the project of soft soil subgrade section of a typical disease types;Chongqing city is a typical soft soil high fill subgrade section,to be a brief overview of the project,the analysis of the characteristics and stability of the landslide mass.Under this section and indoor test results of engineering geological annotation,drilling,revealed the main geotechnical mechanics index of engineering physics,select two calculation section and combined with the origina l landform conditions,shows the segment fill roadbed have been formed through sliding surface,in embankment along the base powder quality clay is a circular sliding failure,after unloading in unstable-basically stable state,at the same time strengthening design scheme are proposed according to comprehensive consideration;（4）High-fil1 road segment of this typical soft soil with FLAC3D simulation.To analyze its little rain during the dry season season and continuous rainfall（rainstorm）under high fi ll embankment and retaining wall with the filling of x,z displacement nephogram,and safety coefficient,maximum shear strain increment cloud judgment which the stability of the subgrade,found that the primary cause lies in the retaining wall to cause an wall not far from the silty clay strata traction type,stage of the conclusion is consistent with theoretical analysis,at the same time the feasibility of the simulation is verified,in turn,also set up.