薄基岩采动破断规律与安全开采分析

首先分析了研究区煤矿山西组煤层剖面和水文地质特征,针对薄基岩的工程地质特征,采用工程地质力学模型实验、数值模拟计算相结合的综合研究方法,对煤层开采薄基岩破断规律进行了分析,计算了薄基岩条件下不同采煤厚度垮落带与导水裂隙带的发育高度,得出采厚大于3.5m时,导水裂隙带会不同程度地触及第四系底部含水层,并且底部粘土层出现裂隙,将对煤层安全开采产生影响,并针对性地提出了相应的防治水措施。经过开采验证,避免了地质灾害的发生。

ANALYSIS OF THE MINING FAILURE REGULARITY AND SAFETY MINING IN THIN BEDROCK

Firstly, the Shanxi formation coal seam sections and hydrogeological features were analysed in research coal field. Based on the engineering geological characteristics of the thin bedrocks, the failure of the overburden during coal mining were characterized by applying comprehensive research method combining engineering geological mechanical model test and finite element numerical simulation. The development height of caving zone and water flowing fractured zone of difference thickness of coal seam were calculated under the conditions of thin bedrocks. When the mining thickness was more than 3.5m, the water flowing fractured zone reached the Quaternary bottom aquifer in different degree, and the bottom clay layer appeared fracture. These would have effect on the safety mining. The appropriate measures on prevention and cure of water were submitted purposefully, which has been confirmed by the field tests and assured that no water-intrusion hazard or sand rush would occur.