摘要:
淮南潘一东煤矿-848 m主胶带机大巷为典型的深部高地应力挤压性软岩巷道，现场调研、FLAC3D数值仿真计算、挤压变形等级评定均表明该巷道开挖后围岩产生了非常严重的挤压大变形，主要表现为变形量大、变形速率高、收敛速率小、变形时效特性显著，巷道稳定性控制非常困难。并分析了挤压变形的主要影响因素包括地应力、岩性、巷道群扰动、底板失稳等。针对主胶带机巷挤压大变形特征，基于深部岩巷围岩稳定性控制理论及“分步联合支护”理论制定了控制围岩挤压变形的支护方案，通过数值模拟和现场监测验证了该支护方案的效果，结果均表明采取该支护方案后围岩变形速率显著降低，并在较短时间内变形趋于收敛稳定，支护方案支护效果良好，能够有效的控制围岩挤压大变形。
Abstract:
-848 m deep main belt machine roadway in Huainan Panyidong coal mine is a typical deep high stress squeezing soft roadway. Site investigation, FLAC3D numerical simulation, squeezing deformation grade evaluation all show that the surrounding rock produces very serious squeezing deformation after excavation, mainly performs as large deformation, high deformation rate, small convergence rate, significantly timeliness characteristics, difficult control of roadway stability. The paper analyzes the main influencing factors of squeezing deformation, including geo-stress, lithology, disturbance of roadway group, floor instability, etc. According to the main squeezing deformation characteristics of main belt machine roadway, based on the stability of surrounding rock control theory and "step combined support" theory, the paper establishes control countermeasures. Through numerical simulation and field monitoring, the effect of the support method is verified. The results show that the deformation rate of surrounding rock is reduced significantly, and the deformation tends to convergence in a relatively short period of time after this supporting scheme. The supporting scheme's supporting effect is good, which can effectively control surrounding rock extrusion large deformation.
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