双马水泥厂矿山运输平硐破坏原因分析

双马水泥厂矿山运输平硐，在经历了2008年512汶川大地震及924大暴雨后，多处发生变形开裂现象。采用现场调查结合室内理论分析得知:平硐破坏主要是因场区地下溶洞发育，提供了地下水通道；平硐边墙后存有潜在不稳定块体；512汶川大地震使得岩体节理及小断层进一步延伸扩展，地下水通道变得更畅通；场区后山相对高差大，924大暴雨形成高动水压力使围岩压力急剧增加，最终造成平硐破坏。

Analysis on Destruction Causes of Mine Haulage Adit of Shuangma Cement Plant

Deformation and cracks occur in many places of mine haulage adit of Shuangma Cement Plant after the occurrence of 5.12 Wenchuan Earthquake and 9.24 Rainstorm of 2008.It is known from site investigation combined with indoor theoretical analysis that haulage adit damage is mainly due to underground cavity development leading to underground water channel.There is potential unstable block in the side wall of haulage adit.5.12 Wenchuan Earthquake caused rock joints and minor fault further extended and underground water channel becoming more flexible.Back mountain is solid with large relative height difference.High dynamic water pressure formed by 9.24 Rainstorm caused wall rock pressure increased rapidly,and finally led to haulage adit damage.