Estimation of support requirement for a deep shaft at the Xincheng Gold Mine, China

Xingdong, Zhao; Li, Yangyang

doi:10.1007/s10064-021-02350-y

Cited by 7 publications

(3 citation statements)

References 22 publications

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“…The geomorphic unit belongs to a hilly region, and the elevation of the ground level ranges from 2.23 m to 31.88 m ACD (Admiralty Chart Datum). The new main shaft was designed to have a depth of 1527 m and a bottom elevation of −1488.1 m, with an inside diameter is 6.7 m [19]. The lining thickness is 300 mm (−622 m level above) and 400 mm (−622 m level below), and the compressive strength of the concrete is 25 MPa.…”

Section: Field and Laboratory Studiesmentioning

confidence: 99%

“…On the basis of Su [5,14], Zhou [16] discusses the completion method of the double series method, decomposes the finite long shaft wall in any axisymmetric problem into symmetry and antisymmetry, and gets the theoretical stress solution of the shaft wall strictly satisfying all boundaries by superposing the stress of the two cases. The construction of shaft sinking is very complex [17], and the complete solution for the distribution of stresses and displacements around a circular opening in an opening is given by Kirsch from the theory of elasticity [18,19]. The characteristics of deep shafts are that the stress boundary conditions in the axial direction of the shaft are asymmetrical, nonuniform, and nonlinear distributions (see Figure 2).…”

Section: Introductionmentioning

confidence: 99%

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A Primary Support Design for Deep Shaft Construction Based on the Mechanism of Advanced Sequential Geopressure Release

et al. 2022

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The construction of 1500 m depth shaft in Xincheng Gold Mine, China, faces complex stress conditions such as high geostress (>50 MPa), high ground temperature (>50 °C), high water-pressure (>9 MPa), and highly corrosive. Traditional deep shafts excavated by the sinking and lining method cannot adapt to high geostress problems, such as rock bursts and large deformations, etc., in the deep shaft construction process. To avoid and adjust the high geostress induced the rockburst and large deformations, the mechanism of the advanced sequential geopressure release (ASGR) has been proposed for the ground control in deep shaft construction. In this paper, the safe distance between the concrete lining and the shaft excavation face is determined based on the ASGR mechanism, which can provide the space for geopressure release, and primary support based on rock mass quality and numerical simulation was employed to control the geopressure and deformation. A new support scheme for the deep shaft is proposed, using long bolts to restrain severe deformations, metal mesh, and a double reinforcement bar to improve the induced stress distribution. According to the results, the construction scheme of deep shaft has been improved, and the safe support distance of the proposed scheme is determined to be 12 m, with an interval of three excavation cycles. Compared to the original scheme of shaft lining after excavation, the proposed scheme based on the ASGR mechanism can effectively improve the geopressure release and benefit from controlling the rockburst and large deformation of deep shaft induced by high geostress conditions. The stress distribution in the lining is more uniform, and safety factor of the lining is increased to 2.0, which is benefit the long-term stability of deep shaft.

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Section: Field and Laboratory Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Primary Support Design for Deep Shaft Construction Based on the Mechanism of Advanced Sequential Geopressure Release

et al. 2022

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“…Srinivasan et al (1999) used the parameters of microseismic events, microseismic energy, and event-dominant frequency as the indicators of rockburst prediction and early warning in the Kolar gold mine in India. Zhao and Li. (2021) conducted the nonlinear analysis of microseismic activities, judged the possibility of rockburst according to the number of microseismic events generated per unit time, and carried out research on the microseismic activity and the potential danger area of rockburst of Hongdoushan Copper Mine.…”

Section: Introductionmentioning

confidence: 99%

Multivariate Early Warning Method for Rockburst Monitoring Based on Microseismic Activity Characteristics

Zhao

Xia

et al. 2022

Front. Earth Sci.

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The monitoring of rockburst is one of the worldwide problems in underground engineering and how to effectively predict and early warn the occurrence of rockburst disasters has become an urgent problem to be solved. In this article, the high rockburst occurrence section of the deep diversion tunnel of Jinping Hydropower Station on the yalong River is taken as the research object. Based on the microseismic monitoring technology and combined with the principle of seismology with qualitative analysis and quantitative calculation, the distribution law of “time, space, and intensity” of microseismic activity and the change law of source parameters time series are used as the precursor characteristics of rockburst early warning. Based on these, the internal relationship between the microseismic activity and the rockburst micro-fracture was studied. The monitoring results show that the rockburst occurred before has obvious micro-fracture precursors. The microseismic activity is a self-organizing process from spatial disordered dispersion to ordered concentration. The abnormal changes in source parameters such as density of microseismic events, seismic energy density, the cumulative volume, energy index, 3S index, and b values can be used as a warning identification of rockburst. Therefore, the multivariate early warning method for rockburst monitoring based on the comprehensive analysis of source parameters in the deep tunnel is proposed. The prediction accuracy of this method is up to 80.6%, and it can provide reference for the rockburst prediction, warning, and safe construction of such tunnel engineering.

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Support design in underground coal mines using modified rock mass classification system (RMRdyn) for enhanced safety– an approach from stable and failed roof cases

Paul,

Murthy,

Prakash

et al. 2024

Environ Earth Sci

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Estimation of support requirement for a deep shaft at the Xincheng Gold Mine, China

Cited by 7 publications

References 22 publications

A Primary Support Design for Deep Shaft Construction Based on the Mechanism of Advanced Sequential Geopressure Release

A Primary Support Design for Deep Shaft Construction Based on the Mechanism of Advanced Sequential Geopressure Release

Multivariate Early Warning Method for Rockburst Monitoring Based on Microseismic Activity Characteristics

Support design in underground coal mines using modified rock mass classification system (RMRdyn) for enhanced safety– an approach from stable and failed roof cases

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