METHOD AND SYSTEM FOR IN-SITU TEST OF MECHANICAL BEHAVIORS AND SEEPAGE CHARACTERISTICS OF COAL ROCK MASS UNDER INFLUENCE OF REAL MINING INDUCED STRESS

摘要

A system for in-situ test of mechanical behaviors and seepage characteristics of coal rock mass under the influence of real mining induced stress, and an in-situ test method based on the test method. The test system comprises a gas source (1), a vacuum pump (2), a test assembly (3), a signal collection transmission assembly, and a ground monitoring station (4); the test assembly (3) comprises a top pressing plate (5), a loading part (6), a test piece (7), a bottom pressing plate (8), an anchor cable stress gauge (9), a flat jack (10), an axial displacement meter (16), a radial displacement meter (17), and a gas isolation chamber (11); the test assembly (3) is mounted in a cut hole (15) provided on the coal rock mass in front of the mining surface; the signal collection transmission assembly comprises a displacement collector (18), a stress collector (19), and a downhole information collection station (20); the stress collector (19) is connected to the anchor cable stress gauge (9); the displacement collector (18) is separately connected to the axial displacement meter (16) and the radial displacement meter (17); the displacement collector (18) and the stress collector (19) are connected to the downhole information collection station (20) by means of a cable; the downhole information collection station (20) is connected to the ground monitoring station (4) by means of the cable.