千米深井软岩巷道挤压变形力学特性及控制研究

 为了研究千米深井软岩巷道挤压变形力学特性及控制对策，以淮南朱集煤矿-906m东翼轨道大巷为依托工程开展研究，该巷道为典型的千米深部高地应力软岩巷道，开挖后围岩产生强烈的挤压变形。通过现场地应力测试获取地应力值和室内岩石力学试验获取围岩力学参数，根据Hoek挤压变形等级曲线判断出该巷道变形为非常严重的挤压变形；通过Phase2有限元数值仿真软件分析了该巷道的围岩稳定性，计算结果表明巷道开挖后围岩变形破坏严重，拱顶位移和底臌量大，与现场情况吻合。基于深部岩石巷道围岩稳定性控制理论和“分步联合支护”理念，针对该巷道的挤压变形特点制定了相应的支护方案，其主导思想是增强围岩自身强度和支护结构的抗变形能力，尤其重视底板支护。通过有限元数值软件计算分析和现场监测验证、评价了该支护体系的强度，结果表明所提出的支护方案取得了良好的效果，能够有效的控制围岩挤压变形。

Research on squeezing deformation mechanics characteristic and control method of kilometers deep soft roadway

In order to study the squeezing deformation mechanics characteristics and control measures of kilometers deep mine soft roadway, the research was carried out based on the project of 906m east wing rail roadway in Huainan Zhu Ji coal mine, a typical kilometers deep high stress soft roadway whose surrounding rock produced strong squeezing deformation after excavation. Through the in-situ stress testing and indoor rock mechanics test to obtain mechanical parameters of the surrounding rock, according to Hoek squeezing deformation grade curve to detect the deformation of roadway is very serious squeezing deformation; through Phase2 finite element numerical simulation to analyze the stability of surrounding rock of the roadway, the calculation results show that the deformation and failure is very serious after excavation, the crown displacement and the floor heave amount is very large, which is consistent with the site phenomenon. Based on the deep rock roadway surrounding rock stability control and the theory of ’step by step combined supporting’ concept, direct at squeezing deformation characteristics of the roadway, the dominant thought of corresponding supporting scheme is to enhance the strength of surrounding rock and the deformation resistance ability of the supporting structure, with particular emphasis on floor support. Through the finite element numerical calculation analysis and site monitoring verification, evaluation of the supporting strength of the system, the results show that the proposed scheme of supporting achieved good effect, can control the squeezing deformation effectively.