最小基岩安全厚度的模拟研究——以薄基岩大断面巷道为例

Simulation on Minimum Bedrock Safe Thickness——Taking Large Section Roadway with Thin Bedrock as an Example

薄基岩大断面巷道稳定性,与基岩厚度、基岩分层厚度、松散层厚度等自然因素有关,也与巷道宽度及支护有关.本文以大柳塔矿某工作面为背景,采用离散元法(UDEC)进行数值模拟,得到不同地质条件下巷道顶板塑性单元个数.以"顶板不出现塑性单元"作为依据,得到不同情况下的最小基岩安全厚度图表.为神东矿区部分煤矿的薄基岩大断面巷道开挖、支护提供了理论依据.

The stability of thin bedrock big section tunnel has to do with the natural factors, such as bedrock thickness, bedrock layered thickness, loose layer thickness, also to do with roadway width and supporting. In this paper taking a work face in Daliuta mine as engineering background, the number of plastic element on the roof un-der different geological conditions are obtained, using discrete element method （UDEC） for simulation. The mini-mum bedrock safe thickness charts under different conditions are analyzed based on “ without plastic element in roof”. These results provide theoretical basis for excavating and supporting of thin bedrock big section tunnel in some mines of Shendong group.