Study on Compression and Thixotropy Properties of Sensitive Silt

Most of the saturated silt in the first terrace of Fenhe River in Shanxi Province is sensitive, which makes the strength and deformation properties of the silt change greatly before and after disturbance. The compression and thixotropy characteristics of sensitive silt were studied by one-dimensional consolidation compression tests and unconfined compression strength tests on undisturbed and remolded soil samples taken from exploration wells. Test results show that the settlement and consolidation coefficient of undisturbed soil increase and the ratio of the main consolidation decreases suddenly when the structure yield stress is reached, and the contribution of secondary consolidation to settlement increases; The difference between undisturbed soils and remolded soils is caused by the structural strength of undisturbed soils. Their compression curves coincide at about 0.58e₀ under the higher consolidation pressure; stress-strain curves of sensitive silt unconfined compressive strength test show strain softening characteristics similar to those of over-consolidated soils, and recovery time after disturbance is time-dependent. Elastic modulus is sensitive to disturbance and can be used as a disturbance index.