scholarly journals Experimental and numerical investigation on a novel support system for controlling roadway deformation in underground coal mines

2019 ◽  
Vol 8 (2) ◽  
pp. 490-500 ◽  
Author(s):  
Yuantian Sun ◽  
Guichen Li ◽  
Junfei Zhang ◽  
Deyu Qian
Keyword(s):  
Numerical Investigation ◽  
Support System ◽  
Coal Mines ◽  
Underground Coal Mines ◽  
Roadway Deformation

Numerical investigation of groundwater outbursts near faults in underground coal mines

2011 ◽  
Vol 85 (3-4) ◽  
pp. 276-288 ◽  
Author(s):  
Li Lianchong ◽  
Yang Tianhong ◽  
Liang Zhengzhao ◽  
Zhu Wancheng ◽  
Tang Chunan
Keyword(s):  
Numerical Investigation ◽  
Coal Mines ◽  
Underground Coal Mines

scholarly journals Stability Control for the Rheological Roadway by a Novel High-Efficiency Jet Grouting Technique in Deep Underground Coal Mines

2019 ◽  
Vol 11 (22) ◽  
pp. 6494 ◽  
Author(s):  
Yuantian Sun ◽  
Guichen Li ◽  
Junfei Zhang ◽  
Deyu Qian
Keyword(s):  
Numerical Model ◽  
Coal Mining ◽  
High Efficiency ◽  
Coal Mines ◽  
Stability Control ◽  
Jet Grouting ◽  
Underground Coal Mines ◽  
Deep Underground ◽  
The Stability ◽  
Roadway Deformation

In maintaining the efficiency of coal mining, the stability of roadway plays a significant role, as it is closely related to the production of coal and the safety of personnel. In deep underground coal mines, the rheological deformation of roadway normally occurs, which affects its service life. To address this problem, in this paper, a novel high-efficiency Jet Grouting (JG) technique was presented, and its control effect on roadway stability was investigated. A creep test of a coal specimen in a laboratory scale was performed, and its creep behavior was revealed. The rheology of the coal mass surrounding the roadway was further analyzed according to the field-monitoring results of roadway deformation. A time-dependent numerical model with a Burger-creep visco-plastic model (CVISC) was established and validated by comparing the calculated displacement with in-situ measurement. The JG technique was tested in the field, and its applicability and practicability were confirmed. According to the validated model and field test results of JG, a numerical model with CVISC by JG support was established to analyze the effect of JG on the roadway. The results showed that the JG support can effectively reduce roadway deformation, optimize stress conditions, and reduce the extent of the plastic zone around the roadway. The rheological properties of the soft coal roadway were constrained and long-term stability was ensured. This pioneering work can guide the application of JG for the stability control of roadways and promote the sustainability of coal mining efficiently.

Rock Load Estimation in Development Galleries and Junctions for Underground Coal Mines: A CMRI-ISM Rock Mass Rating Approach

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Avinash Paul ◽  
V. M. S. R. Murthy ◽  
Ajoy Kumar Singh
Keyword(s):  
Rock Mass ◽  
Support System ◽  
Coal Mines ◽  
Design Guidelines ◽  
Rock Mass Rating ◽  
Indian School ◽  
Indian Coal ◽  
Underground Coal Mines ◽  
Rock Load ◽  
Roof Rocks

Rock mass rating (RMR) plays important role in design and selection of support system (Ghosh, 2000). For stability assessment of rock mass it is very important to know the amount of rock load mobilized around the development gallery which is estimated using RMR (Singh et al., 2003, Barton et al., 1974, Bieniawski, 1984, and Ghosh et al., 1992). In Indian coal mines, Central Mining Research Institute-Indian School of Mines rock mass rating (herein after referred to as CMRI-ISM RMR) is mostly used for formulating design guidelines for supports. In this paper an attempt has been made to correlate CMRI-ISM RMR values and rock load of galleries and junctions for different gallery widths, ranging from 3.6 m to 4.8 m, at different densities of roof rocks. The proposed empirical expression can help in quick design of support system for underground coal mines working in the same regime.

scholarly journals Cause and Solution to Roadway Deformation in Vietnam Underground Coal Mines

2021 ◽  
Vol 1 (2) ◽  
Author(s):  
Quang Phuc LE
Keyword(s):  
Production Efficiency ◽  
Longwall Mining ◽  
Coal Mines ◽  
Mining System ◽  
New Findings ◽  
Roadway Stability ◽  
Underground Coal Mines ◽  
Main Support ◽  
Cable Bolt ◽  
Roadway Deformation

The deformation and support method of roadways have always been important issues in safemining and production. Vinacomin's statistics show that, by 2021, there will be 64.19 km of roadwaysthat need to be repaired (accounting for 25% of the total new roadways). Thus, the problem of maintainingroadway stability is facing difficulties in underground coal mines in Vietnam. To find out the causes ofroadway failures, a case study at roadways of the Khe Cham I and Khe Cham III coal mines, Vietnam, ispresented in this paper. Based on the results of a detailed field survey, the deformation characteristics ofroadways and the failure mode of support structures were investigated. The results show that the roadwaydeformation is severe and the main support cannot control surrounding rock mass. Also, the destructionof support structure is frequent on reused roadways, affecting production efficiency and work safety.Therefore, to reduce deformation and increase roadway stability, a new support method called “multistageanchor of rock bolt + cable bolt” has been developed and a new longwall mining system with criticalcoal pillar width has been proposed. The new findings of the research can provide references for scientificstudies, and apply them in Vietnam's underground coal mine practices.

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