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以卸压瓦斯地面井抽采工程实践取得的大量资料为基础,结合物探测井和透孔成果,研究了保护层开采后抽采井套管的变形和破坏按其原因可划分为二种类型:松散层内岩层内部横向塑性变形引起的破坏;基岩段岩体界面滑移引起的变形与破坏.黏土层由于具有厚度大、低强度和高压缩性的特点而易在其内部发生塑性变形;基岩段岩层受采动影响较大,首先在力学弱面-岩性交界面处发生横向剪切,破坏套管.最后以岩体结构为依据,针对高危区段,提出了治理套管变形错断可行的预防措施.
Based on a large amount of data obtained from the practice of pumping ground surface relief wells in pressure relief gas wells and combining with the results of object detection wells and through-holes, the deformation and failure of casing casing of the extraction wells after the protective layer mining are studied. According to the reasons, they can be divided into two types : Deformation caused by transverse plastic deformation in loose rock strata; Deformation and destruction caused by slip of rock mass interface in bedrock zone. Clay layer is easy to deform plastically due to its large thickness, low strength and high compressibility . The rock mass of bedrock section is greatly affected by mining, firstly, transverse shearing occurs at the interface of weak mechanics-lithology, which destroys the casing.According to the structure of rock mass, based on the rock mass structure, Discontinue possible preventive measures.