丫他金矿地下开采对地表公路的影响分析

Analysis on influence of underground mining of Yata gold mine on surface road

为了确保地表公路的稳定,采用FALC3D有限差分法数值软件对地表公路保安矿柱进行了不同厚度的模拟分析,同时计算分析了地下矿体逐层开挖逐层充填对采场及地表公路稳定性的影响。结果表明:因丫他金矿围岩岩性差,地表公路保安矿柱定为40 m较为可靠,具备一定的安全保障性,上部公路处于稳定状态,而且地下矿体逐层开采逐层充填可有效降低顶板冒落和地表下沉,地表公路产生的下沉变形很小,仅为1.2 cm,同时地表基本未产生塑性扰动区,利于保护地表已有公路设施。研究结果为该深部矿体安全高效回采和地表公路安全稳定提供了理论依据和技术指导。

To ensure the stability of the surface road,the FLAC3D finite difference method was used to simulate and analyze the safety pillars at different thicknesses for protecting surface road.Meanwhile,the effects of the layer-by-layer excavation and filling of the underground ore body on the stability of the stope and the surface road were calculated and analyzed.Results showed that attributed to the poor lithology of the surrounding rock of the Yata gold mine,the safety pillar of the surface road was set to 40 m,which was more reliable and had certain safety guarantee.In this way,the surface road was in a stable state,and the underground ore body mining and filling layer by layer can effectively reduce roof fall and surface subsidence.The subsidence deformation on the surface road was very small,with only 1.2 cm.Meanwhile,there was basically no plastic disturbance zone on the surface,which is conducive to the protection of existing road facilities on the surface.The research results can provide theoretical basis and technical guidance for safe and efficient mining of the deep ore body and safety and stability of surface roads.