Journal Article

Mechanical Analysis of Static Stress Within Fault-Pillars Based on a Voussoir Beam Structure

Ding, Yan-lu, Li, Zhen-lei, Kong, Yong, Dou, Lin-ming, Cai, Wu, Wang, Gui-feng

2016

Overview

Rock bursts are currently considered to be one of the most severe threats to underground safety in coal mining. When mining activities approach faulted areas, rock bursts are more likely and thus often result in casualties. For instance, due to a fault, the extraction of longwall panel 25110 in the Yuejin coalmine suffered 20 rock bursts (Li et al. 2013). Therefore, rock bursts around faulted areas have been studied worldwide (Islam and Shinjo 2009; Ji et al. 2012; Li et al. 2011; Michalski 1977; Pan et al. 1998). The focus of these studies was the fault, while the fault-pillar (the coal pillar between the fault plane and the face line or gateway), has often been overlooked. The concept of fault-pillar induced rock bursts (FPIRB) was rst proposed and analysed by Li et al. (2013, 2014) who investigated the mechanisms underpinning FPIRB behaviour and calculated the static stress within the fault-pillar through a fault-pillar model, which proved that high static stress within the fault-pillar is a key factor inducing rock bursts. Unfortunately, the voussoir beam structure in their model was based on Qian (1982). Thus, the arch compression thickness and buckling failure of the voussoir beam were neglected. Also, the lateral thrust and shear forces were only approximate. As a result, the accuracy of the static stress calculated through their model is poor.

• Publisher: Springer Vienna,Springer Nature B.V
• Subject: Civil Engineering / Coal mines / Coal mining / Earth and Environmental Science / Earth Sciences / Geology / Geophysics/Geodesy / Mechanical engineering / Mining accidents & safety / Occupational safety / Rocks / Shear stress / Technical Note