朱集矿深井软岩巷道大变形机制及其控制研究

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。

Research on large deformation mechanism and control method of deep soft roadway in Zhuji coal mine

In order to explore the large deformation mechanism and control method of deep soft roadway,analysis is made based on the engineering background of level-885 m east wing rail roadway of Zhuji Coal Mine,Huainan mining area.This roadway is a typical deep soft rock of high geostress,of which the surrounding rock becomes extremely unstable,showing strong nonlinear deformation characteristics and high deformation rate after excavation.Rating of the large deformation is firstly made.The surrounding rock stress field and displacement field are analyzed by Hoek-Brown elastoplastic constitutive model.Considering the strength of surrounding rock,the influences of disturbance,the cross-section shape,the roadway deformation mechanism are revealed finally.Optimized supporting method is proposed which is paid great attention to the floor supporting and bottom shearing support.Numerical simulation and field monitoring show that the new method obtained good effect and it’s a kind of effective method to controlling large deformation of surrounding rocks of deep roadway.