Effects of collapse fissure on soil moisture in arid and semi arid mining areas

The variation characteristics of soil bulk density at different depths of collapse fissures is studied at Fuxin in this study in order to quantify the effects of coal mining subsidence on soil moisture. The relationships between the width of the collapse fracture,the distance from the crack and the water content of the soil were explored with hierarchical clustering,the Mann-Kendall rank correlation and the multiple linear regression.The results indicate that the soil bulk density increases linearly with the depth in the study area,and there are obvious changing points.The locations of these changing points of connected cracks,concealed cracks and non-collapse areas are 50 cm,70 cm and 150 cm,respectively.The effects of crack width on soil water content decrease with the depth at different depth cracks with the same width.Under the condition of the same crack and depth,the soil moisture content will then increases with the distance from the crack.The crack width obviously enhance the soil moisture content,and an increase in the crack width usually leads to an increase of the average soil moisture content.

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