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针对淮南矿区顾北煤矿-648 m水平绞车房硐室底板突出严重,容易发生拉剪破坏的特点,首先采用FLAC3D对绞车房硐室支护前的围岩变形和应力分布特征进行了模拟分析:变截面处和底角应力集中明显,在高应力作用下底角剪切滑移和底板折断隆起是造成底臌的根本原因。基于分步联合支护理论,对绞车房硐室底板支护方案进行了优化,并对绞车房硐室表面与深部位移、锚索受力和基础内部应力进行了全方位监测,结果表明:原支护方案下巷道底板变形较大,巷道底角发生剪切滑移诱使巷道断面圆形化,注浆花管和底角地梁可以较好地抵抗底角处的剪切滑移;巷道底板变形量受地应力方位影响较大,采用新的底板联合支护方式不仅可以很好地满足绞车房硐室对底板变形的要求,还能加强两帮稳定性,同时保证了绞车房基础稳定。
In view of the characteristic of the floor of the winch chamber with the level of -648 m in Gu Bei Coal Mine of Huainan Mining Area being serious and prone to tensile shear failure, the deformation and stress distribution characteristics of surrounding rock before the support of winch chamber were firstly simulated by FLAC3D: The stress concentration at the cross section and the bottom corner is obvious. Under the action of high stress, the bottom corner shear slippage and the bottom plate break up and rise are the fundamental reasons for the bottom 臌. Based on the step-by-step combined support theory, the support scheme of the winch chamber floor is optimized, and the surface and deep displacement of the winch chamber, the stress of anchor cable and the internal internal stress are all monitored. The results show that: Under the support scheme, the deformation of the floor of the roadway is large, and the shearing slip of the bottom corner of the roadway induces the roundness of the roadway cross section, the grouting flower pipe and the ground floor girder can better resist the shear slip at the bottom corner; The deformation amount is greatly affected by the ground stress direction. The new joint support method of the floor can not only meet the requirements of the floor deformation of the winch chamber well, but also strengthen the stability of the two sides while ensuring the stable foundation of the winch house.