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攀钢尖山采场露天转地下采用无底柱分段崩落法开采,结合现场工程地质,以相似材料模拟为主要研究手段,对尖山采场1000 m之上的4个阶段采场进行模拟,对开采过程中围岩的移动破坏范围进行研究,实验得出的主要结果如下:露天开采与地下开采两种开采方式对围岩影响的不同,造成两侧围岩,特别是边坡部分的应力分布较为复杂,其外在表现形式之一为转地下开采前后围岩的变形速度不同;随着回采深度的增加,围岩的变形量逐渐增大,变形区域逐渐扩展,向两侧和深部传递;受断层的影响左侧围岩对开挖的反应比右侧围岩敏感,位移移动和破坏变化比右侧大,断层处围岩的稳固性比周围围岩稳固性差,断层面的存在对变形的传递有阻断作用;覆盖层对于控制两侧围岩的变形具有很大的作用。
Based on the engineering geology of the site, mining of the Jianshan stope in Panzhihua was carried out by underground caving with subsidence-free method. Simulating the four stopes above 1000 m in Jianshan stope with the similar material simulation as the main research method, The main results of the experiment are as follows: The two mining methods of open pit mining and underground mining have different influences on the surrounding rock, resulting in the stress distribution of the surrounding rock, especially the slope part Is more complicated. One of its external manifestations is that the deformation rate of surrounding rock before and after underground mining is different. With the increase of mining depth, the deformation of surrounding rock gradually increases, and the deformation area expands gradually to the sides and deep; Affected by the fault, the response of the surrounding rock to the excavation on the left side is more sensitive than the surrounding rock on the right side. The displacement and displacement of the surrounding rock on the left are larger than that on the right. The stability of the surrounding rock at the fault is less stable than the surrounding rock and the presence of the fault plane distorts Of the transfer has a blocking effect; cover for the control of the deformation of the surrounding rock has a great role.