沿空留巷聚乙烯醇纤维喷射混凝土快速封闭支护技术研究
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摘要
沿空巷道邻煤侧封闭施工对于防止瓦斯渗入,保证巷道安全具有重要的意义。目前封闭施工多采用喷射混凝土施工,喷厚8～12cm,施工效率低。聚乙烯醇(PVA)纤维喷射混凝土渗透特性试验表明,当纤维掺量为0.2%～0.6%时,渗透率低于1×10~(-15)m~2,满足封闭施工要求。劈拉试验表明,PVA纤维可以有效提高喷射混凝土的抗拉强度,当纤维掺量为0.4%～0.6%时,封闭厚度4cm即可满足要求。东滩煤矿1309轨顺的PVA纤维喷射混凝土的现场施工表明,封闭施工速度可以提高至50m/班。
Closed coal side closure construction along the empty roadway is of great significance for preventing gas infiltration and ensuring roadway safety. At present, the closed construction is mostly sprayed concrete construction, the spray thickness is 8～12 cm, and the construction efficiency is low. The permeation characteristics test of polyvinyl alcohol(PVA) fiber shotcrete shows that when the fiber content is 0.2%～0.6%, the permeability is lower than 1×10~(-15) m~2, which meets the requirements of closed construction. The pull test shows that the PVA fiber can effectively improve the tensile strength of the shotcrete. When the fiber content is 0.4%～0.6%, the closed thickness of 4 cm can meet the requirements. On-site construction of 1309 rail-oriented PVA fiber shotcrete in Dongtan Coal Mine shows that the closed construction speed can be increased to 50 m/shift.
Closed coal side closure construction along the empty roadway is of great significance for preventing gas infiltration and ensuring roadway safety. At present, the closed construction is mostly sprayed concrete construction, the spray thickness is 8～12 cm, and the construction efficiency is low. The permeation characteristics test of polyvinyl alcohol(PVA) fiber shotcrete shows that when the fiber content is 0.2%～0.6%, the permeability is lower than 1×10~(-15) m~2, which meets the requirements of closed construction. The pull test shows that the PVA fiber can effectively improve the tensile strength of the shotcrete. When the fiber content is 0.4%～0.6%, the closed thickness of 4 cm can meet the requirements. On-site construction of 1309 rail-oriented PVA fiber shotcrete in Dongtan Coal Mine shows that the closed construction speed can be increased to 50 m/shift.
引文
[1]崔亚仲.神东矿区快速沿空留巷技术研究及应用[J].煤炭科学技术,2014,42(01):129-133.
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[3]齐善忠,杨维好.内钢板高强钢纤维混凝土井壁力学特性研究[J].煤炭工程,2016,48(03):103-105+109.
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[8]郭亮.矿物掺合料对混凝土渗透性影响的研究[D].哈尔滨工业大学,2010.
[2]方张平.喷射补偿收缩钢纤维混凝土抗侵蚀试验研究与分析[D].安徽理工大学,2012
[3]齐善忠,杨维好.内钢板高强钢纤维混凝土井壁力学特性研究[J].煤炭工程,2016,48(03):103-105+109.
[4]刘祥桢.东乡铜矿深部软岩巷道加固对策研究及应用[D].南昌大学,2012.
[5]钱桂枫,高祥彪,钱春香.PVA纤维对混凝土力学性能的影响[J].混凝土与水泥制品,2010(03):52-54.
[6]薛会青,邓宗才,李建辉.PVA纤维水泥基复合材料的抗拉性能及韧性研究[J].郑州大学学报(工学版),2009,30(01):92-95.
[7]王永波,罗晖.PVA纤维在水泥基材料中作用的研究[J].重庆建筑,2005(07):62-64
[8]郭亮.矿物掺合料对混凝土渗透性影响的研究[D].哈尔滨工业大学,2010.