In view of the thermal pollution of mines, the heat sources of deep-mine were introduced. A novel thermal insulating concrete was prepared with ceramisite, glazed hollow bead and fly ash as heat insulation materials through orthogonal experiment. The optimum mix ratio was obtained by using efficacy coefficient method. On the premise of guaranteeing concrete’s mechanics performance, the heat preservation and insulation performance was improved, with the thermal conductivity coefficient only 1/8 of normal concrete. With the rockbolt and shotcrete support for the roadway of mining area in Huainan as engineering background, field tests of springback loss, surrounding rock pressure, concrete stress and surrounding rock convergence were conducted. Field monitoring results showed that the proposed insulating concrete material has good heat insulation effect, and its performance could fully meet the requirements of coal-mine shotcrete construction, beneficial for the underground work personnel’s safety and health of body and mind.
Key words
shotcrete /
insulation /
orthogonal experiment /
rockbolt and shotcrete support technique /
engineering application
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References
[1] 谭海文.金属矿山深井热源分析与矿井通风[J].中国矿业,2006,15(11):59-62.
[2] 袁 亮.淮南矿区矿井降温研究与实践[J].采矿与安全工程学报,2007,24(3):298-301.
[3] 苗素军,辛 嵩,彭 蓬,等.矿井降温系统优选决策理论研究与应用[J].煤炭学报,2010,35(4):613-618.
[4] 孙永星.淮南矿区深井降温技术应用综述[J].煤炭工程,2015,47(3):28-31.
[5] 陈亚利.浅析新庒矿井下降温系统的选择[J].煤炭工程,2015,47(8):27-29.
[6] 胡春胜.孙村煤矿深部制冷降温技术的研究与应用[J].矿业安全与环保,2005,32(5):46-48.
[7] 陈宜华,孙 浩.深井高温矿床井下热源与热量分析[J].金属矿山,2011,(11):132-135.
[8] 那寒矗.深井矿山岩体热害源分析与控制[D].长沙:中南大学,2014.
[9] 范瑛红,彭 鹏,侯子义.页岩陶粒混凝土工作性及强度试验分析[J].混凝土与水泥制品,2014,(10):30-33.
[10]张泽平.玻化微珠保温混凝土及其结构的基本性能试验与理论分析研究[D].太原:太原理工大学,2009.
[11]王 松,庞建勇.新型混凝土材料力学性能试验研究[J].煤炭技术,2015,34(2):318-320.
[12]庞建勇,闾 沛.软岩巷道聚丙烯纤维混凝土钢筋网壳复合衬砌试验及工程应用研究[J].岩土力学,2010,31(12):3829-3834.
[13]徐 磊,庞建勇,张金松,等.聚丙烯纤维喷层支护技术研究与应用[J].地下空间与工程学报,2014,10(1):150-155.