Evaluation of the structural integrity of aging mine shafts

Khan, Mohammad Mahmudur Rahman; Krige, G.J.

doi:10.1016/s0141-0296(02)00028-7

Cited by 27 publications

(17 citation statements)

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“…Short-term stabilities of mineshafts during mining and after abandonment are well studied (Walton et al 2018). Stability during aging of abandoned mineshafts is also discussed in some papers (Khan and Krige 2002). What is uncertain is the behaviour of the mineshafts when they are flooded and used for minewater heat recovery, especially when water with alteration in temperature from warmer to cooler is reinjected to the shafts.…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis of Shafts Used for Minewater Heat Recovery

Paraskevopoulou

Shaw

2019

Geotech Geol Eng

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Traditional heating using non-renewable energy resources contributes up to 50% of current carbon emission level. Different sources of renewable energy are being exploited and developed to lower the carbon emission level for continuity of healthy living environment. It is found that thermal energy is stored in minewater flooding abandoned mines. The minewater can be extracted through newly drilled boreholes or existing mineshafts. To ensure successful and sustainable operation, mineshafts have to be structurally stable. When the mines are abandoned, the water level tends to recover. Some of the configurations of the minewater heat recovery may change the temperature of part of the shaft wall. This research aims to provide some insight on the stability of mineshafts for minewater heat recovery through numerical sensitivity analyses on: (a) water level, (b) temperature fluctuations. In the presented research work, rock masses with different properties have been analyzed. Change in temperature is found to mainly change the static Young's Modulus of intact rock and the joint roughness. However, the joint roughness is expressed indirectly using the Geological Strength Index, which has direct relationship with joint roughness and is used in stability analysis. It is found that an increase in water level reduces the integrity of the whole shaft. The degrees of stability deterioration are different at different depths and depend on the in situ stress state. Findings of this analyses can be assist in making a decision on the selection of the appropriate configuration for minewater heat recovery.

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Section: Introductionmentioning

confidence: 99%

Stability Analysis of Shafts Used for Minewater Heat Recovery

Paraskevopoulou

Shaw

2019

Geotech Geol Eng

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“…Therefore, the necessity to maintain the airflow required in all workplaces is important to guarantee mine safety production [4,5]. However, many different ventilation layouts can be found out [6,7], thus, the strategy to solve the ventilation-related problems in an underground mine should be according to the real situation in each case study [8,9]. According to [10], the behaviour of the ventilation system is dynamic and air demand increases as the mine is developed, requiring sometimes the installation of additional ventilation shafts, upgrading fans or enlarging existing airways [11].…”

Section: Introductionmentioning

confidence: 99%

Airflow Stability and Diagonal Mine Ventilation System Optimization: A Case Study

2018

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Airflow reverse is a severe problem in an underground ventilation system. In addition, the airflow stability and safety production can be seriously affected by the problem of air velocity overrun in the roadways. In this study the crucial causes of the ventilation problems in a coal mine case study are analyzed and a solution is proposed through an analytical methodology. Measurements indicate high air resistance in the shaft and low values in the maintenance roadway, generating abnormal airflow directional behaviors. Strategies to solve the ventilation-related problems have been proposed and implemented, verifying normal ventilation conditions.

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“…By virtue of the high geotechnic stress, serious deformation occurs during the sinking of a main shaft at Jinchuan Mine number 3; a tolerable deformation of 95 mm before lining is reasonable in order to maintain the shaft stability, as suggested by Zhao et al [10]. In addition, it is noted that the dynamic interaction between the conveyances and the conveyance guiding system of aging mine shafts should be analyzed in order to examine the workability of shaft [11]. At Chengchao Iron Ore in China, the shaft exhibited evident degradation because of mining activities, Huang et al [12] thought that the east shaft can continue to be used despite the surface subsidence rate of 0.314 mm/d and 0.144 mm/d in horizontal and vertical directions, respectively.…”

Section: Introductionmentioning

confidence: 99%

Effect of Shaft Pillar Extraction on Stability of Main Shaft: A Case Study at Xincheng Gold Mine, China

Liu

Zhu

Guan

et al. 2018

Mathematical Problems in Engineering

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Mining of ore body in the vicinity of a shaft has a significant influence on its stability. The in situ monitoring and numerical simulation are employed to analyze the effect of shaft pillar extraction at Xincheng Gold Mine. The XI# ore body is recently found around and beneath the shaft, and mining in this area may be detrimental to the shaft. Firstly, on the base of geological survey and in situ displacement monitoring, mechanical parameters of rock mass are obtained and the displacement around the shaft is measured. Secondly, the sensitivities of five main factors that may affect the shaft displacement are analyzed by means of orthogonal experiment according to the numerical simulation with FLAC3D. Finally, a numerical model is established according to the in situ condition; in order to forecast the shaft displacement induced by mining activities of XI# orebody, the Mining Priority Index (MPI) is put forward and used to select the optimal mining sequence. Based on the comparison between the numerical results with the monitoring data, it is determined that the ore within 100 m from the shaft is not suggested to be extracted until the last period of the shaft life.

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Evaluation of the structural integrity of aging mine shafts

Cited by 27 publications

References 0 publications

Stability Analysis of Shafts Used for Minewater Heat Recovery

Stability Analysis of Shafts Used for Minewater Heat Recovery

Airflow Stability and Diagonal Mine Ventilation System Optimization: A Case Study

Effect of Shaft Pillar Extraction on Stability of Main Shaft: A Case Study at Xincheng Gold Mine, China

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