Salawusu formation of Yushen mining area is competent loose aquifer, a aquiclude of loess and laterite in the bottom, and together with bedrock weathering zone showing good water-resisting function.

Based on geological and mining conditions of Baodian Colliery and occurrence characteristic of loose aquifer,a set of successful mining experience of 1316 Full-mechanized Caving Mining Face of 1st Mining Area under loose aquifer of quaternary system was concluded here.

Based on the geological and mining conditions and occurrence characteristics of loose aquifer of Xinglongzhuang Colliery,water bursting cause of 4303 full-mechanized caving mining face under loose aquifer was analyzed,the prevention measures of the 3rd aquifer and reasonable dimension of coal pillar for sand proof were discussed in this paper.

Numerical simulation study on the damage rule of overlying strata in mining under water bearing soft strata

Mechanism of supports crushing accident and its preventive measures during coal mining near unconsolidated confined aquifer;

By using the specially designed simulator for unconsolidated confined aquifer,experiments on the load transfer mechanism of unconsolidated confined aquifer were carried out for the first time both at home and abroad.

The results reveals a mechanism of subsidence by mining in mines with thick aqueous soil layers and is of significance in increasing accuracy of subsidence prediction.