The Hongwan area in Zhuhai has widespread silt distribution

with specific engineering characteristics 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

a

v

ranging from 1.269 to 1.618 MPa

-1

and a compression modulus

E

s

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.