水压作用下防砂安全煤岩柱失稳机理及留设方法

发布时间：2018-04-21 16:07

本文选题：水压 + 楔形区　；参考：《煤炭学报》2017年02期

【摘要】：针对厚松散含水层、薄基岩等特殊地质条件下楔形区工作面防砂安全煤岩柱失稳溃砂的问题,以赵固一矿11071工作面突水溃砂灾害为例,结合地质钻孔资料,建立了楔形保水压采动溃砂地质模型。通过黏土液塑限试验,风化带岩石干燥饱和吸水率和崩解试验,得出了底黏及风化带泥类岩具有良好的隔水性能,可形成楔形保水压结构。并在此基础上,通过水压作用下风化带泥类岩采动裂隙扩展试验研究了受采动损伤的煤岩柱保护层在水压作用下失稳的内在致灾机理。结果表明:在高水压的作用下,风化带泥类岩采动裂隙扩展为管道,防砂煤岩柱保护层的阻砂性能失效;考虑煤岩柱保护层的损伤厚度,提出了水压作用下防砂安全煤岩柱的留设方法,并在11191工作面进行了工程应用,取得了预期效果。研究成果补充完善了我国防砂安全煤岩柱的留设方法,可减少煤矿溃砂事故。
[Abstract]:In view of the problem of sand control safety in working face of wedge area under special geological conditions, such as thick loose aquifer and thin bedrock, this paper takes 11071 face of Zhaogu No. 1 Mine as an example and combines geological drilling data. The geological model of sand collapsing in wedge hydrostatic mining is established. Through the clay liquid plastic limit test, the dry saturated water absorption and disintegration test of the weathered zone rock, it is concluded that the bottom viscosity and weathered zone mudstone has good water insulation performance, and can form a wedge-shaped water pressure retaining structure. On the basis of this, the mechanism of instability of coal and rock pillar protection layer under water pressure is studied by the test of mining crack expansion of mudstone in weathered zone under water pressure. The results show that under the action of high water pressure, the mining fissure of mudstone in weathering zone is extended to pipeline, and the sand control performance of the protective layer of sand control coal pillar is invalid, and the damage thickness of the protective layer of coal and rock pillar is considered. The retaining method of sand control safety coal pillar under the action of water pressure is put forward, and the engineering application is carried out in 11191 working face, and the expected results are obtained. The research results complement and perfect the method of setting up safe coal and rock pillars for sand control in China, which can reduce the accidents of coal mine sand collapse.
【作者单位】：中国矿业大学(北京)资源与安全工程学院;国家煤矿水害防治工程技术研究中心(北京);
【基金】：国家重点基础研究发展计划(973)资助项目(2013CB227903) 国家自然科学基金煤炭联合基金重点资助项目(U1361209)
【分类号】：TD822.3;TD323

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