Experimental Study On Undrained Strength Of Silt With High Water Content Considering Time Effect

At present,our country mainly uses cutter suction,suction and hydraulic dredging,the reclaimed silt with high water content and poor permeability,low effective stress characteristics of newly dredged mud as the bearing capacity is low,it cannot be used as a building foundation,and large machinery can not be directly in the ground treatment,so it is necessary to study on the strength variation of newly blown filled muck.In this paper,the dredged silt in Tianjin and Taizhou areas is studied,and the variation rule of undrained strength under different time and different initial soil water content and soil properties is discussed.The main contents and innovations of this paper are as follows:1?Self-developed consolidation instrument can be used for the effective stress between 0~25kPa,the instrument set aside vane shear instrument docking interface,can be unloaded in the case of unloading of low effective stress state of silt Drainage strength test,and compared with the three-axis undrained strength to verify the feasibility of the test method.2?The consolidation and compression tests of remolded soil samples with low effective stress(0~25kPa)were carried out by self-developed consolidation apparatus.The consolidation and compression characteristics of remolded soil samples under low effective stress were determined.The initial compression curve of the initial moisture content is below the compression curve with high initial moisture content.3?The undrained strength of remolded soil samples under low effective stress was tested by Vane Shear Apparatus,and the research scope of undrained strength of remolded soil samples was extended.The undrained strength of remolded soil samples under low effective stress was determined.The ratio of effective consolidation pressure is also constant,enriching the study data of undrained strength of remolded soil samples.4?The effect of time on the undrained strength of remolded soil samples was studied.The results showed that the undrained strength of remolded soil samples increased with time,and the undrained strength increased with the increasing of the initial soil water content To 60 days between the obvious growth,60 days after the strength growth is limited.