Highwall mining hazards and mitigation

2017 ◽  
pp. 283-296
Author(s):  
John Loui Porathur ◽  
Pijush Pal Roy ◽  
Baotang Shen ◽  
Shivakumar Karekal
Keyword(s):  
Highwall Mining ◽  
Mining Hazards

scholarly journals Development of placer deposits in the North using highwall mining systems

2021 ◽  
pp. 84-89
Author(s):  
I.I. Kovlekov
Keyword(s):  
Technology Implementation ◽  
Unit Cost ◽  
Mining Industry ◽  
Precious Metals ◽  
Climatic Conditions ◽  
The Arctic ◽  
Practical Case ◽  
Resource Base ◽  
Highwall Mining ◽  
Placer Deposits

The article studies various aspects of the highwall mining systems applicability for the development of productive sands in terms of the occurrence conditions as well as the mining and technical parameters of placer deposits. The harsh climatic conditions of the Arctic zone and the specific properties of frozen sands impose additional requirements on the operation of the mining complex. Positive and negative aspects of the practical application of mining complexes been analysed with reference to the development of precious metals and gemstones deposits. The most promising mining sites have been identified, where the use of highwall mining systems is technologically and economically feasible. Commercial mining of reserves in the boundary zones in high walls of depleted fields and in thin unconventional seams will substantially expand the mineral resource base of mining companies. A promising trend of this technology development is discussed that includes backfilling of the mined-out space in order to reduce the loss of mineral resources. The ice-rock mixture is proposed as the backfill material, which significantly reduces the unit cost of these operations. A practical case of this technology implementation is described for the development of substandard sands of a placer deposit in the Far North conditions. The possibility of developing the reserves of tin placer deposits on the Arctic shelf using the highwall mining systems has been identified as the most promising direction of scientific and practical research for the development of the mining industry in the region.

Microseismic Monitoring of Highwall Mining Stability at Moura Mine, Australia

2001 ◽  
Vol 32 (3-4) ◽  
pp. 340-345 ◽  
Author(s):  
Xun Luo ◽  
Justin Ross ◽  
Peter Hatherly ◽  
Baotong Shen ◽  
Mary D. Fama
Keyword(s):  
Microseismic Monitoring ◽  
Highwall Mining

Identification of displacement zone in extraction of coal reserves from pit wall by highwall mining systems in the Talda deposit in Kuzbass

2020 ◽  
pp. 21-24
Author(s):  
A. I. Bykadorov ◽  
◽  
D. N. Degtyarev ◽  
S. A. Smirnov ◽  
O. Yu. Pechenegov ◽  
...  
Keyword(s):  
Highwall Mining ◽  
Coal Reserves ◽  
Displacement Zone

scholarly journals Stability Analysis of Rib Pillars in Highwall Mining Under Dynamic and Static Loads in Open-Pit Coal Mine

2021 ◽  
Author(s):  
Haoshuai Wu ◽  
Yanlong Chen ◽  
Haoyan Lv ◽  
Qihang Xie ◽  
Yuanguang Chen ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Stability Analysis ◽  
Theoretical Calculation ◽  
Open Pit ◽  
Winkler Foundation ◽  
Beam Model ◽  
Mining System ◽  
Static Loads ◽  
Pillar Stability ◽  
Highwall Mining

Abstract The highwall miner can be used to mine the retained coal in the end slope of an open-pit mine. However, the instability mechanism of the reserved rib pillar under dynamic and static loads is not clear, which restricts the safe and efficient application of the highwall mining system. In this study, the load-bearing model of the rib pillar in highwall mining was established, the cusp catastrophe theory and the safety coefficient of the rib pillar were considered, and the criterion equations of the rib pillar stability were proposed. Based on the limit equilibrium theory, the limit stress of the rib pillar was analyzed, and the calculation equations of plastic zone width of the rib pillar in highwall mining were obtained. Based on the Winkler foundation beam theory, the elastic foundation beam model composed of the rib pillar and roof under the highwall mining was established, and the calculation equations for the compression of the rib pillar under dynamic and static loads were developed. The results show that with the increase of the rib pillar width, the total compression of the rib pillar under dynamic and static loads approximately decreases in an inverse function, and the compression of the rib pillar caused by static loads of the overlying strata and trucks has a decisive role. Numerical simulation and theoretical calculation were performed in this study. In the Numerical simulation, the coal seam with a buried depth of 122 m and a thickness of 3 m was mined by the highwall miner. According to the established rib pillar instability model of the highwall mining system, it is found that when the mining tunnel width is 3 m, the reasonable width of the rib pillar is at least 1.3 m, and the safety factor of the rib pillar is 1.3. The numerical simulation results are in good agreement with the results of theoretical calculation, which verifies the feasibility of the theoretical analysis of the rib pillar stability. The research results can provide an important reference for the stability analysis of rib pillars under highwall mining.

scholarly journals Slope Stability Calculation Method of Highwall Mining with Open Cut Mines as an Example

2021 ◽  
Author(s):  
Juyu Jiang ◽  
Ye Lu ◽  
Dong Wang ◽  
Xinping Han
Keyword(s):  
Slope Stability ◽  
Recovery Rate ◽  
Limit Equilibrium ◽  
Coal Pillar ◽  
Time Dependent ◽  
Universal Method ◽  
Stability Calculation ◽  
Target Time ◽  
Highwall Mining ◽  
Overlying Strata

Abstract Highwall mining machines have been used to recover retained coal at the toe of highwalls and endwalls over the past few decades. However, there has not been a universal method to evaluate the slope stability using highwall mining while maximizing the recovery rate. Based on the required service time of coal pillars, this study proposes the concept of the target time pillar strength. To obtain time-dependent parameters for the coal, time-dependent shear tests were performed on specimens from an open-cut mine in Inner Mongolia. The highwall mining length was divided into three categories based on discontinuous structural plane theory: goaf, yielding, and elastic zones. The three zones were considered to all have resistances against shear stress. The basal coal seam is likely to become weak due to weight from the overlying strata, which may change the slope failure mode from circular to sliding along the weak layer. Numerical modeling was used to study the influence of the overlying strata and target time strength on the yielding zone development at the coal pillar ribs. The coefficients of the three zones were determined and substituted into the Mohr-Coulomb equation to obtain the time-dependent shear strength parameters. Subsequently, the influence of highwall mining on the slope stability was evaluated using the rigid body-limit equilibrium method (LEM). The optimized coal pillar width is determined to maximize the recovery rate without compromising the slope stability.

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