Simulation test device and method for multi-angle tilt drilling grouting technology for coal seam bottom plate under effect of pressure-bearing flowing water

Abstract

The invention discloses a simulation test device and method for a multi-angle tilt drilling grouting technology for a coal seam bottom plate under the effect of pressure-bearing flowing water. The simulation test device comprises a test rack, a pressure-bearing aquifer water source applying device, multi-angle drilling and different hole diameter fracture simulation devices and a grouting device;the test rack is used for bearing the multi-angle drilling and different hole diameter fracture simulation device; the multi-angle drilling and different hole diameter fracture simulation devices aredivided into multiple sets according to drilling angles and the sizes of fractures; the pressure-bearing aquifer water source applying device comprises a constant-pressure water pump, a water pressureadjusting valve, an open source fracture and sealed fracture control valve and a flowmeter; and the grouting device comprises a grouting machine, a safety valve, a slurry flushing valve, a grouting channel valve, a grouting hole selecting switch and a disassembly-free flushing valve. According to the simulation test device, simulation of a grouting process layout process, simulation of a dynamicprocess of slurry flowing to diffusion, simulation of drilling tilt angles to the slurry diffusion influence, and scenario simulation of precipitation and condensation mechanisms can be achieved.

Description

technical field [0001] The invention relates to a multi-hole multi-dip angle combined grouting process simulation experiment device based on the grouting hole arrangement process. Background technique [0002] In the process of coal mining, the coal seam is seriously threatened by the confined water in the floor aquifer, and the water inrush coefficient is high. How to prevent the water inrush from the floor confined water is an important problem to ensure safe production of the working face. In particular, some aquifers with sufficient water sources but difficult to evacuate seriously affect mine production; the key to on-site implementation is often to choose floor grouting. At present, the theory of grouting diffusion radius is an empirical formula recognized by industry experts, and is widely used in mine grouting engineering. However, the grouting process and grouting mechanism of deeper multiple boreholes still need to be studied. For example, although the floor grou...

AI Technical Summary

Problems solved by technology

The technical research directions of the existing model tests are mostly focused on the crack shape simulation of the floor rock mass, the grout diffusion radius and shape analysis, the three-dimensional and large-scale research of the test bench or test device, and the cost is very high; however, the floor grouting drilling , especially the technological arrangement of multiple grouting holes, the influence of the inclination angle of the borehole on the grouting, and the simulated experimental devices for the coupled grouting of boreholes and fractures are few and almost blank.

The main reason is that there are two problems that are difficult to solve in the experiment: the sealing is difficult when high water pressure is applied, and the expansion of high-pressure water flow and high-pressure slurry in similar materials is difficult to control

In the past, the influence of the inclination angle of the borehole on the grouting process simulation device under the action of confined water was rarely involved. However, in the grouting project, the length of the long borehole is large and the number is large, which can not be ignored.

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