Numerical simulation of roof bolt system during depillaring operations in bord and pillar panel

Abstract

Abstract-Roof bolting technology is widely used for support design in an underground coal mine. This paper focused on the numerical simulation considered the behaviour of roof and rock -grout -bolt interaction. Simulation of three dimensional model of depillaring panel with roof bolt support is difficult to simulate. Therefore, an analogy has been developed to replicate three dimensional depillaring panel into two dimension considered physico-mechanical properties of the immediate roof, geotechnical property of the mine and bolt and grout properties as an input parameters. A case of depillaring panel has been chosen for study. The simulation of rock bolt gives the result in terms of axial load developed on the bolt with depillaring panel advancement. Field observation of instrumented rock bolt has taken for validation of the numerical model. It has been observed that the maximum load developed on the model is very close to the field data.

Estimation of Hoek-Brown Strength Parameters from Time-Dependent Geotechnical Classification as Coal Roof Index (CRI) using Critical Plastic Strain Technique

“…Nowadays, the Numerical modelling technique is a widely acceptable and more appropriate technique for support design and stability assessment in underground structures such as tunnels, galleries, junctions, and working face in underground coal mines. Several authors such as [5], [6], [7], [8] has suggested that the numerical tool is far more advanced as compared to an empirical method and they considered FOS to be 1.5 to obtain rock load height for stable cases. The rock mass classification is a prime input parameter in the numerical method.…”