新型隔热混凝土喷层支护技术研究与应用

针对当前矿井热害问题,对深井热源进行了阐述,从喷射支护材料角度出发,选取陶粒、玻化微珠、粉煤灰作为隔热材料,通过正交试验的方法,研制出一种新型隔热混凝土;由功效系数法得出最佳掺量配比,在保证混凝土力学性能的前提下,提高了保温隔热性能,其导热系数仅为普通混凝土的1/8。结合淮南矿区巷道锚喷支护工程,进行了回弹损失、围岩压力、混凝土应力和围岩收敛的现场试验。现场监测结果表明,该种隔热混凝土材料不仅隔热效果明显,而且工作性能完全符合井下喷射混凝土的施工需要,有利于井下作业人员的安全和身心健康,具有良好的推广和使用价值。

Research and Application of a Shotcrete Support Technique Using Thermal Insulating Concrete

In view of the thermal pollution of mines, the heat sources of deep-mine were introduced. A novel ther-mal 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, sur-rounding 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.