EXPERIMENT STUDY ON PORE STRUCTURE CHARACTERISTICS OF CRACKED SOIL IN ZHENLAI COUNTY

Aiming at the research of the water and salt transport problem of saline soil in Zhenlai County, Jilin Province, large amount of fractures were found in the soil, which was called cracked soil.In order to study the water-salt transport problem in saline soil effectively, this paper mainly discussed the pore characteristics of the fractured soils with different depth in the vertical direction. Mercury intrusion porosimetry test(MIP test) was done to obtain the micro pore distribution of undisturbed soil samples after field investigation and in-situ sampling. The quantitative analysis result shows that the micro pore distribution of the cracked soil has obvious bimodal distribution characteristics. The two peaks located between small pore and large pore range respectively. And the pore fractal dimension of soil sample is larger the volume content of fractures in the soil is much larger, and the maximum of fracture rate is 34.9% in the soil with 0.2m depth, in addition the fracture rate decreases with the increase of depth.