Integration of underground mapping, petrology, and high-resolution microseismicity analysis to characterise weak geotechnical zones in deep South African gold mines

Mngadi, Siyanda; Durrheim, Raymond; Manzi, M.; Ogasawara, Hiroshi; Yabe, Yasuo; Yılmaz, Halil; Wechsler, Neta; Aswegen, Gerrie van; Roberts, D.; Ward, A. K.; Naoi, Makoto; Moriya, Hideshige; Nakatani, Masao; Ishida, Akimasa; Team, Satreps; Team, Icdp Dseis

doi:10.1016/j.ijrmms.2018.10.003

Cited by 18 publications

(4 citation statements)

References 24 publications

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“…Conglomerate with the particle size up to 30 mm also showed a similar rule. The larger the gravel particle size, the stronger the heterogeneity of particle size, the lower the compressive strength and Young's modulus and the more obvious the plastic characteristics of stress-strain curve [15][16][17][18]. Conglomerate is generally regarded as a two-phase composite material due to the great difference in mechanical properties between gravel and matrix.…”

Section: Jw 0000-0003-4435-0291mentioning

confidence: 99%

Numerical simulation study on the crack propagation of conglomerate

Luo

Wang

et al. 2021

R. Soc. open sci.

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The conglomerate reservoir is rich in oil and gas reserves; however, the gravel's mechanical properties and laws are difficult to gain through laboratory experiments, which furthermore constrain the hydraulic fracturing design. To analyse the failure law of conglomerate, we simulated the uniaxial compression test based on discrete element software PFC2D and analysed the effect of different cementation strength, gravel content and gravel geometry on the rock deformation and failure characteristics. Results show that (i) as the cementation strength decreases, the compressive strength and elasticity modulus both reduce clearly, while the crack shapes get more complex and the critical value is 0.3; (ii) as the gravel content increases, the conglomerate strength first decreases then increases under the influences of cracks bypassing gravels; cementation strength and gravel content of the conglomerate both contribute to the increase in local additional stress, which leads to a series of changes in crack shapes and mechanical properties of the conglomerate. Based on the above research, the conglomerate strength and crack shapes after failure are relatively complex due to the common influence of cementation strength and gravel content. The gravel edge crack caused by stress concentration is the micro-mechanism that affects the conglomerate mechanical properties.

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Section: Jw 0000-0003-4435-0291mentioning

confidence: 99%

Numerical simulation study on the crack propagation of conglomerate

Luo

Wang

et al. 2021

R. Soc. open sci.

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“…Recently, due to the development of new technologies such as computer technology and communication technology, microseismic monitoring has been gradually applied in mining engineering. A large number of researchers have combined microseismic monitoring technology with deep learning, numerical simulation, and other technologies, and applied them in coal mining projects in many places around the world [28][29][30][31][32][33][34][35][36][37]. D'Angiò et al [28] proposed the Damping Ratio Anomalies Monitoring (DaRtAM) to detect the rock mass damaging.…”

Section: Introductionmentioning

confidence: 99%

Determination of Fractured Water-Conducting Zone Height Based on Microseismic Monitoring: A Case Study in Weiqiang Coalmine, Shaanxi, China

Gao

2022

Sustainability

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The NO. 3 coal seam of the Weiqiang coalmine is faced with a water inrush threat caused by two large reservoirs and the upper confined aquifer. However, existing empirical formulas cannot accurately predict the height of the fractured water-conducting zone; thus, it is necessary to investigate the extent of the fractured water-conducting zone according to the geological conditions of the No. 3 coal seam. The microseismic monitoring system (MMS) was used to monitor the surrounding area of the 1311 working face in real time to obtain the microseismic event information during the fracture development. The detailed situation of the fractured water-conducting zone in three-dimensional space was determined by computer analysis. The results show that the height of the fractured water-conducting zone is 110 m, which is consistent with the range (105.4~120.4 m) measured by various field drilling results and the mechanical mechanism analysis based on the key strata theory (112 m). The achievement of microseismic monitoring provides a guarantee for safety production and prevention and control of mine water disaster in the 1311 working face of the No. 3 coal seam, and can also be applied and promoted in coalmines with similar geological conditions, with significant social and economic benefits.

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“…Previous studies have neglected the influence of pillar strength on the bearing characteristics of the BPS. However, the strength of pillars in different mines has significant differences 16–18 . Therefore, it is necessary to use the strength of the pillar as the focus point to explore its influence on the bearing characteristics of the BPS and the interaction between backfill and pillar.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of the influence of pillar strength on the internal synergy relationship in the backfill‐pillar system

Sun

Feng

et al. 2021

Num Anal Meth Geomechanics

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The influence of the strength of the pillar on the bearing characteristics of the backfill‐pillar system (BPS) based on the mechanism of backfill. Quantitative synergy relationships between backfill and pillar were defined and pointed out. There are four kinds of quantitative synergy relationships in the bearing process of the system. To verify the relationship, systems with different strengths of the pillar were selected to carry out numerical simulation experiments, and a mathematical calculation method to quantify synergy relationship in the BPS was designed. The results show that the system under the low strength of the pillar presents the overall increase in bearing characteristics, while the system under the high strength of the pillar presents “N”‐type bearing features. Four kinds of quantitative synergy relationships able to characterise the action mechanism between backfill and pillar in each stage of the bearing of the system. Through analysis and discussion, it was concluded that the essential reason for the difference in bearing characteristics is that the effect of displacement restraint, joint support, and passive compressive weaken with the increase of the strength of pillar. The effect of pillar strength on the internal synergy of BPS is well verified by numerical simulation test.

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Integration of underground mapping, petrology, and high-resolution microseismicity analysis to characterise weak geotechnical zones in deep South African gold mines

Cited by 18 publications

References 24 publications

Numerical simulation study on the crack propagation of conglomerate

Numerical simulation study on the crack propagation of conglomerate

Determination of Fractured Water-Conducting Zone Height Based on Microseismic Monitoring: A Case Study in Weiqiang Coalmine, Shaanxi, China

Numerical simulation of the influence of pillar strength on the internal synergy relationship in the backfill‐pillar system

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