基于激光巷道断面检测仪的巷道非对称大变形特征分析
Analysis of Large Asymmetric Deformation Characteristics Based on Laser Instrument for Roadway Section Detection
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摘要: 不同时期巷道全断面尺寸检测能够揭示巷道围岩变形特征及演化规律，为巷道支护设计和围岩控制提供依据。但对于非对称大变形巷道，传统的人工测量方法难以准确表征巷道变形特征。以某矿141511回风巷为工程背景，采用YJDM3.6矿用激光巷道断面检测仪对回采阶段不同位置断面进行了检测。结果表明：回采过程中，3 m宽窄煤柱沿空掘巷段和25 m宽大煤柱掘进段巷道断面均呈现非对称大变形特征，断面收缩率达65%~69%；随着回采工作面的推进，离工作面越近，141511回风巷非对称大变形趋势越发明显，且窄煤柱帮变形量明显大于实体煤帮变形量，巷道围岩控制应重视窄煤柱帮支护；YJDM3.6矿用激光巷道断面检测仪对非对称大变形巷道变形量快速检测及特征分析具有良好的适应性。Abstract: The full-section size detection of roadway in different periods can reveal the deformation characteristics and evolution regularity of roadway surrounding rock, and provide the basis for roadway support design and surrounding rock control. But for the large asymmetric deformation roadway, the traditional manual measurement method is difficult to accurately characterize the deformation characteristics of the roadway. Taking the 141511 return-air roadway of a mine as the engineering background, the YJDM3.6 mine-used laser instrument for roadway section detection is used to detect the different positions of the mining roadway. The results show that the roadways along the edges of mined-out areas with 3 m width pillars or 25 m width pillars both take on asymmetric large deformation characteristics and the section shrinkage rate is 65% to 69%; with the advancing of the mining face, the closer to the face of the 141511 is, the more obvious deformation trend of the 141511 return-air roadway is, the deformation of the narrow pillar is obviously larger than that of the solid coal pillar, the supporting of rib along the narrow pillar should be paid more attention; YJDM 3.6 laser instrument used for roadway section detection has good adaptability to the rapid detection and characterization of large asymmetric deformation roadway.
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