Coal seam drilling pressure relief indoor simulation test system and method

The invention belongs to the field of geotechnical engineering indoor tests, and relates to a coal seam drilling pressure relief indoor simulation test system and method, and the system comprises a mechanical loading device, a drilling device, and an external monitoring device. And the mechanical loading device is an indoor mechanical testing machine. The drilling device is composed of a rigid cushion block, a bearing frame, a drilling machine, a gear and rack transmission mechanism and the like. The external monitoring device is a DIC high-speed camera system. The test method comprises the following steps: (1) preparing a raw coal sample and measuring the uniaxial compressive strength; (2) preparing a coal-rock-like material sample and calibrating the strength; (3) arranging a test system; (4) applying axial loads with different levels to the sample in advance; (4) the axial load is maintained, and drilling is carried out; (5) continuously loading by the testing machine until the sample is damaged; (6) sorti