隧道穿越采空区的稳定性分析与研究

以小江口隧道和坪地煤矿为研究对象，根据工程所在地的地质条件和围岩特点，利用数值模拟的方法，对采空区的稳定性及其对隧道的影响进行分析研究，并针对分析结果提出相应的治理方案，从而为小江口隧道的安全施工和营运提供理论支持。研究结果表明，一、二盘区留设的点柱稳定性较差，不能起到长期支撑顶板的作用，一、二盘区部分采空区会产生顶板冒落；隧道K线ZK67 555至隧道出口段、D线ZK67 466至隧道出口段两侧各90m范围内的下覆老采空区需进行充填处理。

Analysis and Study on Stability When Tunnel Excavated Trough Mined-out Area

Xiaojiangkou tunnel and Pingdi coal mine were the research objects. According to the geological condition and surrounding rock characteristics of the project site, the stability of mined-out area and its influence on tunnel were studied by numerical simulation method. Corresponding treatment scheme was put forward to provide theoretical support for safe construction and operation of Xiaojiangkou tunnel. Results show that the stability of the point pillars in one or two panel is poorer, so it cannot have long-term effect of roof supporting. Roof caving will occur in part of the mined-out areas. From K line ZK67 555 and D line ZK67 466 to the tunnel exit, in 90m range, the old mined-out area below need to be filled.