Genetic analysis of the bedrock top surface soil layer deletion and its significance for water prevention in Yushen mining area

In order to study the genetic of the Miocene-Middle Pleistocene soil layer deletion and its relationship with the mine gushing water in Yushen mining area, we used core drilling, field observations and mathematical statistics to analyze the relationship between bedrock top elevation and soil layer residual thickness, and used the principle of "the present is the key to the past" to analyze the genesis and erosion mechanism of the soil layers. The results showed that the erosion of the soil layers in Yushen mining area was the result of the joint action of precipitation, wind, and the linear flowing water. The linear flowing water was the main controlling factor of soil layers vertical erosion until complete deletion. There was a positive linear correlation between the bedrock top elevation and soil layer residual thickness in Yushen mining area. The lack of soil layer could be used as a direct indicator of the development of paleorivers, thereby restoring the Miocene-Middle Pleistocene paleorivers formation, distribution and ancient watershed that communicated with the bedrock top surface. The aquifer filled with paleorivers on the bedrock top surface was the main source water for coal mine gushing, which would bring great harm for the coal mines safety production.