Similar material for simulating coal mining structure water inrush, preparation and use method thereof

Abstract

The invention discloses a similar material for simulating coal mining structure water inrush, and a preparation and use method thereof. The similar material takes 10.1-20.3 parts of soybean, 33.0-59.0 parts of river sand, 20-40 parts of calcium carbonate, and 1.5-7.0 parts of gypsum as the raw materials. The preparation method includes: firstly mixing all the raw materials evenly, then adding water into the evenly mixed raw materials, further performing stirring until the raw materials reach certain plasticity and liquidity, finally putting the materials into a test die, performing laying according to the spatial position and distribution pattern of the actual geologic structure, and carrying out room temperature cooling and curing, thus obtaining the similar material. The similar material provided by the invention can indirectly realize the influence effect of water pressure on surrounding rock, has the activity of simulating tectonic activation, and further can simulate structural damage activation under coupling and display the formation and evolution of a water channel.

Description

technical field [0001] The invention relates to the field of similar materials and their preparation methods and use methods, in particular to a similar material for simulating water inrush in coal mining structures, a preparation method and a use method of the similar material. Background technique [0002] Most of the water inrush accidents in my country's coal mines are caused by the existing fault structures, and the water inrush accidents caused by faults account for more than 80%. Most of the accidents are non-water-conducting faults under the original geological conditions under the influence of mining However, it is still blank to use similar materials to simulate structural water inrush under laboratory conditions. [0003] The current research on this aspect in the prior art uses methods such as cutting and packing to simulate. Fu Guang et al. (Physical simulation experiment and application of evaluation criteria for vertical gas-sealing performance in fault quiesc...

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Problems solved by technology

Fu Guang et al. (Physical simulation experiment and application of evaluation criteria for vertical gas-sealing performance in fault quiescent period[J]. Natural Gas Industry, 2005, 07: 20-22+14-15) used a gas-sealed gas with 1% mineralized water Quartz sand is used to fill the fault zone to simulate the sealing of the rock mass in the fault zone. This experimental method cannot simulate the real fault environment, and the material cannot simulate the fault rock with certain mechanical properties; Lu Yanfang et al. (Characteristics of natural gas migration in reverse faults Physical simulation of [J]. Geological Sciences, 2005, 04:16-27+3-4.) When loading the miniature model, use 2mm thick rubber to simulate the concealed structure. This method is used to simulate cavities generated during tectonic activities. This method only replaces faults with cavities, which is inconsistent with reality; Shan Yixian et al. (Research on the influence of formation composition on fault structure based on physical simulation experiments[J]. Yield, 2015, 02:24-27.) Using unconsolidated sand and mud as experimental materials to simulate the dual structure of faults, although this method is similar to the original geological conditions, the material cannot simulate active activation in a coupled environment effect

Under the action of water pressure and mine pressure, the materials used in the above-mentioned fault simulation method cannot realize the simulation of fault activation, which makes the test phenomenon not obvious and unreliable

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