珠海洪湾地区淤泥物理与宏观力学特性研究OA北大核心CSTPCD

The Hongwan area in Zhuhai has widespread silt distribution,with specific engineering charac-teristics of low strength,significant deformation,and poor permeability.Its physical and mechanical properties are crucial for engineering safety.To explore the engineering characteristics of the silt,this study used undisturbed samples taken from the field to conduct laboratory experiments of basic physical property test,one-dimensional consolidation test,and consolidated undrained triaxial test.The results show that the natural moisture content of the soil samples is high,with a significant plasticity index and a hydraulic conductivity k ranging from 3.68×10-7 to 5.86×10-7 cm/s.It is classified as highly compressible soil based on the determined compression coefficient av ranging from 1.269 to 1.618 MPa-1 and a compression modulus Es ranging from 1.449 to 1.919 MPa.With increasing depth,samples show a gradual decrease in the compression coefficient and an increase in the compression modulus.The shear strength of the undisturbed soil samples is relatively low,with a cohesion c range of 10.10 to 20.84 kPa and an internal friction angle φ ranging from 7.28° to 12.09°.With increasing sample depth,the change in the internal friction angle is relatively small,while the cohesion significantly decreases.