Influence of faulting on a mine shaft—a case study: part II—Numerical modelling

Bruneau, G.; Hudyma, Marty; Hadjigeorgiou, John; Potvin, Yves

doi:10.1016/s1365-1609(02)00116-8

Cited by 45 publications

(18 citation statements)

References 1 publication

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“…Taking faults as an example [22], during the advancing of the working face, the overlying rock mass above the gob is destroyed by tensile stress, which leads to the movement of rock strata since faults belong to the weak structure planes, and have no resistance to the tensile stress. When the movement of the rock strata reaches faults, the overlying strata on both sides of faults are easy to shear and slip along the fault planes.…”

Section: Mechanism Of Mining-induced Surface Movement Scope Control Bmentioning

confidence: 99%

Control Technology of Surface Movement Scope with Directional Hydraulic Fracturing Technology in Longwall Mining: A Case Study

Feng

Guo

et al. 2019

Energies

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Mining-induced surface subsidence causes a series of environmental hazards and social problems, including farmland destruction, waterlogging and building damage in the subsidence area. To reduce mining damages, an innovative method of controlling the surface movement scope via artificial weak planes generated by hydraulic fracturing technology was proposed in this paper. Numerical models were built to analyze the influence of weak planes with different heights and dips on the overlying strata movement. The numerical simulation results showed that the weak planes structure cut off the development of the overlying strata displacement to the surface and affected the surface movement scope. When the weak planes’ dips were bigger than the angle of critical deformation, with the increase of the weak planes’ heights (0–120 m) the advance angle of influence changed from 53.61° to 59.15°, and the advance distance of influence changed from 173.31 m to 140.27 m which decreased by 30.04 m. In applications at Sihe coal mine in China, directional hydraulic fracturing technology was used in panel 5304 to form artificial weak planes in overlying strata. The measured surface subsidence and deformation value met the numerical simulation results and the mining-induced surface movement scope reduced. Moreover, no damage occurred to the surface buildings which were predicted to be in the affected area after extraction. This technology provided a new method to protect the surface structures from damages and had great benefits for the sustainable development of coal mines.

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Section: Mechanism Of Mining-induced Surface Movement Scope Control Bmentioning

confidence: 99%

Control Technology of Surface Movement Scope with Directional Hydraulic Fracturing Technology in Longwall Mining: A Case Study

Feng

Guo

et al. 2019

Energies

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“…Bruneau (2000) describes displacements along the W41 fault and W42 fault and postulates that the mobilisation of the block formed by the W41, W42 and possibly the basement contact zone (BCZ) into the mining void is responsible for the damage. Bruneau et al (2003a;2003b) published two papers relating to X41 shaft. The first paper gives a detailed description of the instrumentation installed in the shaft as well as a comprehensive history of measured deformations and the mining activities that were associated with increased rates of deformation.…”

Section: Historic Rock Mechanics Investigationsmentioning

confidence: 99%

Work conducted in preparation for partial extraction of X41 shaft pillar at Mount Isa Mines

Potgieter¹

2015

Proceedings of the International Seminar on Design Methods in Underground Mining

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The X41 shaft at Mount Isa Mines is one of the two vertical shafts and one of the three main accesses used to transport men and material to the underground copper mine. The X41 shaft is located on the eastern edge of the orebody. The X41 shaft is intersected by a number of geological features, most notable of these are the W41 fault, the W42 fault and the basement contact zone. The extraction of the orebody has allowed the block formed by these structures to rotate. The rotation has resulted in deformation to the shaft barrel, which in turn has resulted in damage to the shaft lining and deformation to the shaft steelwork. This deformation was first identified in the early 1980s. Due to the deformation and associated damage, a shaft pillar was put in place to protect the shaft. As the mine approaches its end of life, the relative value of the ore contained within the shaft pillar has increased considerably. An investigation was undertaken to determine the probable impacts to shaft operations if ore within this shaft pillar were to be extracted. This paper discusses the assessments that were undertaken to determine the extent and rates of deformation that are expected to occur due to the mining operations. It describes the instrumentation that is being used to verify these predictions. Finally, it discusses the operational controls required to safely extract portions of the shaft pillar while allowing it to maintain operations supplying workers and material to the underground mine.

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“…Verma et al [37] carried out field investigations at different tunnels to study blast-induced damage for a wide range of rock mass qualities. Previous studies investigating the loads acting on shaft linings consider the displacement and stress distribution around the shaft, but the impact of the blast-induced damage is not taken into account [38][39][40]. In this article, field tests on the blast-induced damage distribution around a deep shaft were carried out.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the Impact of Blast‐Induced Damage on the Rock Load Supported by Liner in Construction of a Deep Shaft: A Case Study of Ventilation Shaft of Micangshan Road Tunnel Project

Fang

Yao

Walton

et al. 2020

Advances in Civil Engineering

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The rock load acting on the lining of an underground excavation is influenced by multiple factors, including rock type, rock mass condition, depth, and construction method. This study focuses on quantifying the magnitude and distribution of the radial loads on the lining of a deep shaft constructed in hard rock by the so-called short-step method. The blasting-induced damage zone (BDZ) around the shaft was characterized using ultrasonic testing and incorporated into the convergence-confinement method (CCM) and 3D numerical analyses to assess the impact of BDZ on rock loading against the liner. The results show that excavation blasting of shafts is an important controlling factor for the degradation of the rock mass, while the orientation and magnitude of the principal stress had a minimal influence on the distribution of blast-induced damage. The analysis shows that increasing the depth of blast damage in the walls can increase the loads acting on the lining, and the shear loads acting on the liner could be significant for shafts sunk by the short-step method in an area with anisotropic in situ stresses.

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Influence of faulting on a mine shaft—a case study: part II—Numerical modelling

Cited by 45 publications

References 1 publication

Control Technology of Surface Movement Scope with Directional Hydraulic Fracturing Technology in Longwall Mining: A Case Study

Control Technology of Surface Movement Scope with Directional Hydraulic Fracturing Technology in Longwall Mining: A Case Study

Work conducted in preparation for partial extraction of X41 shaft pillar at Mount Isa Mines

Evaluating the Impact of Blast‐Induced Damage on the Rock Load Supported by Liner in Construction of a Deep Shaft: A Case Study of Ventilation Shaft of Micangshan Road Tunnel Project

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