PROPERTY STUDY OF SOLIDIFIED LOESS UNDER WET-DRY CYCLES

The resistance of wet-dry cycles is an important durability index of solidified soil. It is important to explore the effect of environmental features, namely wet-dry cycles, on the performance and durability of loess solidification. In this paper, the solidified agent of SH is used in the loess solidification. By simulating the climate change of wet-dry cycles characteristics indoor, the effects of wet-dry cycles on compressive strength and shear strength of the solidified loess are analyzed. The test results show that: the strength of samples after wet-dry cycles is declined or weakened in overall. With the increase of number of cycles, the compressive strength values for samples exponential decline, but they are higher than the loess. SH content increases, the compressive strength losses reduce. The weight losses are very smaller, and the integrities are good. The parameters of shear strength decrease with SH content. The effects of wet-dry cycles on cohesion are obvious. During the beginning of three wet-dry cycles, the cohesions of the loess solidification by different contents of SH are decreased; after fourth cycles, the cohesions have a little increase, and then show a little decrease. With the increase of wet-dry cycles, they proceed to a relatively steady state. The internal friction angles of the solidified loess express a decreasing tendency, and maintain stability. Because of the change of water quality during the condensation-evaporation process, the weight and volumetric changes of specimens are flexuous. By analyzing the relationship between the stress and strain of the loess solidification by 10%SH content, it is concluded that the solidified loess has hardening characteristic. The loess solidification by more than 10%SH content is durable against 15 cycles for its higher and more steadying strength. Subsequent to that, it is good in water stability, and solidified agent of SH applied in loess of anti-wet-dry cycle has a prominent role. SH has a broad prospect in application.