A simulation test platform and test method for rotary spray curing and sealing holes

Abstract

The invention discloses a rotary-jet-grouting solidifying hole sealing simulation test platform and a test method. The test platform is mainly composed of a coal / rock mass fixing table, a rotary-jet-grouting drilling machine, a high-pressure grouting pump, a slurry stirring device, a sealing-effect inspecting device and the like. The test method includes the steps that screened coal / rock powder, water and other preparing materials are mixed to be even to be poured into the coal / rock mass fixing table; after a test block is solidified and molded, a drill hole is constructed in the test block through the rotary-jet-grouting drilling machine; in the process of drawing back a drilling rod, sealing slurry is subjected to rotary jet grouting while lifting the drilling rod, the sealing slurry is evenly sprayed to the inner wall of the drill hole and forms a sealing layer, the slurry permeates into fractures / gaps in the periphery and is solidified, and communication between the drill hole and the fractures / gaps in the periphery is isolated. In order to obtain the optimal sealing effect, the parameters of the devices and the ratio of the slurry need to be adjusted, and testing is repeated. The effect is tested through the specially-made inspecting device, and the tested result is of important practical significance in selection of the lifting speed, the rotating speed, the rotary-jet-grouting pressure, the rotary-jet-grouting flow and the ratio of the slurry.

Description

technical field

[0001] The invention relates to a test platform and a test method, in particular to a simulation test platform and a test method for a rotary spraying curing hole sealing simulation test platform and a test method suitable for drilling and sealing holes in underground gas drainage in coal mines. Background technique

[0002] There are many methods for the study of gas drainage drilling and sealing, such as theoretical analysis, numerical simulation, etc., and the test method is also a very important scientific method. For high gas or outburst mines, gas drainage must be carried out first, that is, through Drilling is used to extract the gas in the coal seam or goaf by drilling. Aiming at the deficiency of the current hole sealing technology, technical innovation is needed, and the investigation of the sealing performance of the gas drainage borehole is basically carried out in the downhole. Due to the limitation of the downhole conditions, many tests cannot b...

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