Iris Publishers - Global Journal of Engineering Sciences (GJES)

The Analysis of Spalling Effect on the Stress Distribution of Underground Pillar Spalling Using FLAC3D


Authored by Yichen Chen



In underground mining, miners have to carry out high-risk work under extreme conditions [1]. Pillar and roof span stability are two essential prerequisites for safe working conditions in room-andpillar mines [2]. Unstable pillars can result in rock sloughing from the pillar and can lead to the collapse of the roof if one or more pillars should fail. Failure of the rock surrounding underground excavations in hard, brittle rock tends to initiate by a process of spalling in which slabs of rock are formed parallel to the excavation surfaces [2] (Figure 1). Spalling is a process that occurs when the confining stress is low and the rock splits in a direction parallel to the major compressive stress and forms slabs which can dislodge and fall [3]. In addition to causing safe hazards to operators, the rib spalling will also decrease the size of the pillar, reducing the pillar strength. In this study, a series of numerical models were created to simulate different size of pillars with spalling. Through the FLAC3D models to understand the effect of sidewall spalling on the pillars by the stress distribution and diversification after simulation [4].

 

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