The Development And Application Of Solid-liquid Coupling Similar Stimulation Non-hydrophilic Material For Water-protection Mining

Based on Shigetai MINE containing impermeable layer and overlying strata geological characteristics, the use of fluid-structure coupling simulation similar theoretical principles developed water conservation mining similar simulation of non-hydrophilic material. Development of the use of non-hydrophilic material similar simulation simulation Shallow close seams repeated mining overburden fractured law, the law of the guide to explore the conduction of water channels. By using physical simulation, impermeable layer overlying strata movement characteristics and fractured law, between the upper and lower Overburden thickness factors affect the hydraulic conductivity fractured aspects were analyzed, with the measurement results of water testing Shigetai MINE hole to verify the non-hydrophilic material physics simulation similar reliability. The main results are as follows:(1) The damage of aquifuge is in the form of tensile failure that breaks with the sudden by the test of mechanical properties, and aquifuge can remain integrity and have a strong ability of water-resisting property as long as the level of tensile deformation ε does not exceed 0.20%~0.24%.(2) With the fluid-solid coupling similar principle, composite materials of aquifuge are developed by physical simulation test for fluid-solid coupling in water-preserved mining and a rational proportion of non-hydrophilic is researched. Sand and gypsum are adopted as the aggregate of physical simulation materials, while vaseline and silicone oil are served as cementing agent. Firstly, water-physical properties of the material, including water absorption, permeability, distensibility and fluid-solid coupling softening effect, have been studied. Then, basic mechanical property of the material, plasticity has been tested on this basis. Finally, a series of rational proportions fit for aquifuge materials have been discovered, i.e. the weight ratios of sand and gypsum is between 5:1 and 7:1, aggregate and cementing agent between 6:1 and 8:1, and vaseline and silicone oil between 1:1 and 3:1. Meanwhile, using sand, gypsum and calcium carbonate as a raw material, we formulated 63 different proportions of bedrock similar simulation material measured each material uniaxial compressive strength, tensile strength, shear strength, rich physics laboratory select the type of simulated mining overburden strata movement similar materials. Meanwhile, to further seek full physical simulation similar stress- strain curves of the foundation.(3) Making use of physical simulation method, considering changing layer production ratio, mining height, the upper and lower seams open cut in the wrong distance and other factors, the simulation under different mining conditions Seams cut in the upper and lower central gob stopping line side of overburden rock caving mining influence, fractured, bent by the movement of subsidence. Meanwhile, the determination of the upper and lower seams opening cut in the side, the mining side and the side of stopping line height of water flowing fractured development.(4) According to the field level observation,hole observations analysis and comparison of the results with the physical simulation results using non-hydrophilic similar materials described physical simulation with the field of Water fractured mining law coincide, reaching non-physical simulation laboratory similar hydrophilic material requirements.