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为了研究深井软岩巷道大变形机制及其控制对策,以淮南矿业集团朱集矿885 m东翼轨道大巷为支护工程实践。该巷道为典型的深井高地应力软岩巷道,开挖后围岩表现出强烈非线性大变形特点,变形速率大。首先进行了围岩大变形等级识别,并基于Hoek-Brown弹塑性模型分析了巷道围岩的应力场、位移场,考虑巷道断面形状、围岩强度特征、巷道群扰动等影响,揭示了该巷道的大变形机制。针对885 m轨道大巷提出了新支护方案,该方案尤其注重底板支护和底角抗剪支护。数值模拟和现场监测表明,该支护方案取得了良好效果,是一种有效控制深井软岩巷道大变形的支护方法。
In order to study the large deformation mechanism of deep soft rock roadway and its control measures, the 885 m east wing track and laneway of Zhuji Mine in Huainan Mining Group is used as a support engineering practice. The roadway is a typical deep well and high stress soft rock roadway. After excavation, the surrounding rock shows strong non-linear large deformation and large deformation rate. First, the identification of large deformation of surrounding rock is carried out. Based on the Hoek-Brown elastic-plastic model, the stress field and displacement field of the surrounding rock are analyzed. Considering the influence of the section shape, the strength characteristics of the surrounding rock and the disturbances of the tunnel group, The big deformation mechanism. A new support scheme is put forward for the 885 m railroad roadway with special emphasis on floor support and corner shear support. The numerical simulation and on-site monitoring show that the supporting scheme has achieved good results and is a support method for effectively controlling the large deformation of deep soft rock roadway.