Research on the Failure Mechanism and Control Technology of a Near-Fault Roadway Floor

Aiming at addressing the serious problem of floor heave near the fault roadway, this paper conducts an on-site investigati on of the pump room in a mining area and analyzes the influencing factors of the floor heave near the fault roadway. On this basis, the disturbance mechanism of the fault on the roadway stability was studied through theoretical analysis. The numerical model of the near-fault roadway was established by finite difference software (FLAC3D) and the orthogonal test scheme was designed to explore the influence of the three factors of roadway-fault distance, fault dip angle and fault friction coefficient on the floor heave. Based on the theory of “two points and three zones,” the sensitivity of the zero-displacement marking-depth change under different support schemes was systematically studied. The principle of floor treatment and the combined support technology of floor grouting anchor cable and T-shaped steel belt were proposed in a governance plan. The engineering results show that with the adoption of the new support scheme, the deformation of floor was reduced from 1106 to 134 mm, which verifies that the treatment of the floor heave was highly effective.