关键层理论在采场底板突水危险性评价中的应用

基于岩层控制中的关键层理论,采用砌体梁理论对底板关键层破断块体的稳定性进行了分析,从而对采场底板突水危险性做出评价。结果表明,底板关键层破断岩块的高长比越小,其形成的砌体梁结构抗滑落失稳的能力越大;关键层破断后互相咬合中间上浮量达△时,就形成了岩块结构的变形失稳。所以根据底板关键层破断岩块的高长比及岩块间咬合中间上浮量,可以判断采场底板突水的危险性。

Application of Key Stratum Theory in the Risk Evaluation of Water Inrush from Stope Floor

Based on the theory of key stratum in ground control,the stability of broken block in the key stratum of floor was analyzed by using the theory of masonry beam,and the risk of water-inrush from stope floor was evaluated.The results showed that the smaller the ratio of the broken block's height and length,the greater the masonry beam's resistance to slide instability,if the ascending quantum between the broken blocks reach a certain extent,deformation instability may happen between the broken blocks.So the ratio of the broken block's height and length and the ascending quantum between the broken blocks can be used to evaluate the risk of water-inrush from stope floor.