In-Situ Test Study on Mechanical Parameters of Wenzhou Soft Soils
The soft soil has typical engineering characteristics such as,high moisture content,large void ratio,poor permeabili-ty,large compressibility,low shear strength,long consolidation time,high sensitivity,easy to thixotropy,easy to disturb,and the rheology.A better understanding of the engineering characteristics of soft soils is critical and fundamental for analyzing and mitigating the safety issues of the underground engineering construction and operation in thick and soft soils.A series of in-situ tests were carried out in the Wenzhou soft soils,and the mechanical parameters obtained by different test methods were ob-tained.Based on the laboratory test results,the differences of mechanical parameters obtained by different test methods are e-valuated and compared,and the best test method for charactering different mechanical parameters is determined.The cone pen-etration test should be used for the undrained shear strength and the foundation bearing capacity.The compression modulus can be mainly estimated by the laboratory tests,companied with the cone penetration test.The at-rest lateral earth pressure coeffi-cient should be obtained by a dilatometer.The sensitivity should be obtained by the vane shear test.The vertical permeability coefficient can be obtained by laboratory test and piezocone penetration test.This research can provide the theoretical support for the geotechnical aspects of construction engineering in Wenzhou soft soils.
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