Research on New Solid Waste Heat Insulation Material for Deep Mining

The global demand for mineral resources has led to the gradual transformation of mining industry from traditional shallow, small-scale mode high-intensity deep underground mines. Due high stress, temperature, permeability, and easy disturbance mines, new challenges have been brought materials. Some scholars improved thermal insulation performance concrete by adding low conductivity materials such as ceramsite, shell, natural fiber shotcrete, but there are still costs, insufficient support strength, unsatisfactory effects. Given background related fact that it is not possible fully recycle large amount solid waste generated activities, this paper, with shotcrete its basis, uses coal fly ash replace part cement tailings sand gravel aggregate. In addition, adds basalt reduce restore strength. An orthogonal experiment three factors levels was designed explore a type waste-based material. Through testing analysis mechanical properties specimens, concluded optimal ratio 45% ash, 50% tailings, 25% (the percentage total mass cement). compressive strength specimens after curing 28 days could reach 16.26 MPa, apparent density were 0.228561 W/(m·k) 1544.00 kg/m3, respectively. By using COMSOL Multiphysics multi-physics coupling software analyze stress field temperature field, optimum thickness layer material 150 mm. application in mine Shandong Province proved met effects ability isolate heat conduction) support. successful trial provides idea solving problem damage utilization which certain practical significance.