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为研究松软煤层水力冲孔卸压增透特性,自主研制了水力冲孔物理模拟试验装置,其主要结构包括喷嘴、水力冲孔钻杆、水力冲孔旋转系统、水力冲孔推进系统、底座及固定系统等。该装置可基于自主研制的多场耦合煤层瓦斯抽采物理模拟试验系统,开展不同地应力状态及不同水力冲孔条件下的水力冲孔物理模拟试验。利用该系统进行了水力冲孔物理模拟试验,分析结果发现,冲孔过程中由于水力冲孔卸压作用,导致影响区域范围内煤体产生压缩变形,同时钻孔成像结果反映了水力冲孔孔洞形态及水力冲孔卸压造成的裂隙位置及形态,为后期分析水力冲孔卸压机理及水力冲孔后瓦斯运移规律提供了一定的支撑。
In order to study the pressure-increasing and permeation-enhancing characteristics of hydraulic punching in soft coal seam, self-developed hydraulic punching physical simulation test device has been developed. Its main structure includes nozzle, hydraulic punching drill pipe, hydraulic punching rotating system, hydraulic punching propulsion system, Fixed systems. The device can be based on self-developed multi-field coupled coal seam gas drainage physical simulation test system to carry out different state of stress and hydraulic punching under the conditions of hydraulic punching physical simulation test. The system was used to carry out the hydraulic punching physical simulation test. The results show that the compressive deformation of the coal body occurred in the affected area due to the hydraulic punching and pressure-relief during the punching process, and the drilling imaging result reflects the hydraulic punching hole Morphology and hydraulic punching pressure relief cracks caused by the location and shape for the late analysis of hydraulic punching mechanism of pressure and hydraulic punching after the gas migration provides some support.