Numerical Analysis for Anchoring Surrounding Rock of Thick and Soft Coal Roadway

Abstract

According to the surrounding rock stability type determined through fuzzy comprehensive evaluation, bolt and cable support parameters for thick and soft coal roadway were selected based on the engineering analogy method. Considering two conditions that the roadway was arranged along the roof and along the floor, the activity law of the roadway surrounding rock was simulated through Fast Lagrangian Analysis of Continua in Three Dimensions (FLAC3D) program. The results showed that the lower part of roadway walls in two layout forms has large displacement. When driving along the roof, the maximal floor heave is 3.2 times as many as that of driving along the floor. The roof control is important when the roadway is arranged along the floor. Comparing the surrounding rock deformation, the soft coal roadway arranged along the floor is beneficial to the roadway stability; and it is important to support the top and the lower part of walls.