Characterization of Aseismic Fault-Slip in a Deep Hard Rock Mine Through Numerical Modelling: Case Study

Sainoki, Atsushi; Mitri, Hani S.; Chinnasane, Damodara

doi:10.1007/s00603-017-1268-1

Cited by 19 publications

(7 citation statements)

References 43 publications

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“…In light of the discussion above, a different case, where the regional stresses are increased to σ V = 40 MPa and σ H = 60 MPa, is examined with the same procedure to detect seismic events and compute their magnitudes. The vertical stress approximately corresponds to a depth of 1,500 m. Although there are exceptions, generally induced seismicity starts to increase around a depth of 600 m and becomes more intense at depths greater than 1,000 m in deep underground mines (Dineva & Boskovic, 2017; Sainoki, Mitri, & Chinnasane, 2017; Santis et al., 2019; Tajduś et al., 2018). The result is summarized in Figure 18a.…”

Section: Discussionmentioning

confidence: 99%

“…The elastic compliance tensors computed for each zone, considering the characteristics of fractures therein, are applied to the continuum model. Then, a stress analysis is performed with the boundary traction method (Sainoki, Mitri, & Chinnasane, 2017; Shnorhokian et al., 2014a, 2014b), that is, stresses are applied to the lateral and top boundaries whilst constraining the bottom boundary (in the vertical direction). Previous studies demonstrated that the boundary traction method is capable of simulating pre‐mining heterogeneous stress state attributed to the difference in stiffness amongst various rock types.…”

Section: Methodsmentioning

confidence: 99%

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Numerical Modeling of Complex Stress State in a Fault Damage Zone and Its Implication on Near‐Fault Seismic Activity

et al. 2021

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Numerical Modeling of Complex Stress State in a Fault Damage Zone and Its Implication on Near‐Fault Seismic Activity

et al. 2021

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“…A loading system consisting of the air pump with a stress of 0.02929 MPa was applied in the model [12,13], in which the self-weight of the other 250 m rock strata was loaded. With the completion of the model, cutting height, excavation footage, and boundary pillars (actual width of 36 m) were set as 80 mm, 50, and 300 mm, separately.…”

Section: Physical Simulation Systemmentioning

confidence: 99%

Mechanism of Support Optimization and Confined Blasting of Thick and Hard Rock with a Wedge-Structure Immediate Roof: A Case Study

et al. 2021

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Based on the occurrence conditions of a thick and hard main roof and wedge-structure immediate roof in the Zhuxianzhuang Coal Mine, the fracture characteristics and instability migration law of a thick and hard roof (THR) were examined via physical simulations. Mining zones were divided with respect to the strata behaviors and roof control difficulty levels, and the principles and methods of zonal control under THR were put forward. This study proposed a coordinated control strategy of using confined blasting in water-filled deep holes, and reasonable support optimization, which could effectively reduce the roof fracture size, increases the supporting intensity and eliminate roof-control disasters. The length of confined blasting blocks and supporting intensity were calculated using a mechanical model for roof control in the strong strata behavior zone and less-strong strata behavior zone. These key parameters were determined as 20–25 m and 1.15–1.28 MPa, respectively, and the mining strategy was successfully applied in working face 880, performing high security and reasonable economical efficiency.

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“…For example, the slips of the fault F16 which is a thrust fault with a length of 45 km, a dip angle of 15°-75°, and a throw of 50 m-500 m, have caused hundreds of rockbursts in Yima coal field of China up to now (Cai et al 2015;Lu et al 2019). Unfortunately, the mechanism of fault slip is still under debate (Sainoki andMitri 2014, 2015a;Meng et al 2016a, b;Yu et al 2016;Manouchehrian and Cai 2017;Sainoki et al 2017;Wang et al 2017;Duan et al 2019;Ma et al 2019;Hu et al 2020;Jiang et al 2020;Liu et al 2020;Rinaldi and Urpi 2020;Li et al 2021). Some researchers found that fault's properties play an important role in the fault slip (Zhang et al 2000;Lee et al 2001;Karami and Stead 2008;Candela et al 2011;Asadi et al 2012;Zhang 2014;Li et al 2015;Sainoki and Mitri 2015b;Wu 2015;Deng et al 2018;Meng et al 2018).…”

Section: Introductionmentioning

confidence: 99%

“…The properties of a fault mainly consist of its type, asperity, length, filling, drop height, etc. Other researchers proposed that the stresses including static and dynamic ones may affect fault behavior and cause fault slips (Sainoki and Mitri 2014;Sainoki et al 2017;Cai 2017, 2018;Jiang et al 2020;Li et al 2021;Gao et al 2021). In coal mines, the mining operation can weaken the surrounding rock mass and unload the in-situ stresses surrounding a fault (He et al 2016;Wu et al 2017;Rinaldi and Urpi 2020), and then result in fault slips (Batugin et al 2016;Kong et al 2019).…”

Section: Introductionmentioning

confidence: 99%

An experimental study of fault slips under unloading condition in coal mines

Zhang

Shan

et al. 2023

Bull Eng Geol Environ

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To investigate the mechanism of fault slips in coal mines, a biaxial shear experiment was carried out under unloading condition based on the fault F16 in Yima city, China. Two rock samples were used in the experiment and each sample was composed of two triangular sandstone blocks which were put together to simulate the fault. One rock sample was used to do fault slip tests and it was called slip-test sample. The other sample for comparison with the slip-test one was untested, and it was named non-slip-test sample. During the biaxial shear experiment of the slip-test sample, normal and shear strains near the fault, acoustic emission (AE) signals, and the sliding displacement were measured. After the experiment, microscopic profiles of fault surfaces of both rock samples were examined by scanning electron microscope (SEM). In addition, a numerical simulation was conducted to model the slip of the fault F16. The results indicate that: (1) three fault slips occurred during the biaxial shear experiment, and the shear stress, normal and shear strains in the first slip showed the maximum variation among three slips; (2) Shear strains near the two ends of the fault had a more significate variation than that in the middle part, and the typical trend of shear strains was first dropping, then increasing rapidly, and then falling slowly to a specific value during the first slip; (3) The first slip had the largest sliding displacement of 29.89 $$\mu m$$ μ m , and in the first slip three phases including slow slip, main shock and aftershock occurred based on AE monitoring results. (4) On the fault surface of non-slip-test sample, microstructures such as bulges, voids and veins were ubiquitous and notable, making the fault surface much rough, while similar microstructures were few and the fault surface of the slip-test sample was flattened after fault slips; (5) The slipping direction in the shallow part and deep part of the fault F16 were opposite during mining.

show abstract

Characterization of Aseismic Fault-Slip in a Deep Hard Rock Mine Through Numerical Modelling: Case Study

Cited by 19 publications

References 43 publications

Numerical Modeling of Complex Stress State in a Fault Damage Zone and Its Implication on Near‐Fault Seismic Activity

Numerical Modeling of Complex Stress State in a Fault Damage Zone and Its Implication on Near‐Fault Seismic Activity

Mechanism of Support Optimization and Confined Blasting of Thick and Hard Rock with a Wedge-Structure Immediate Roof: A Case Study

An experimental study of fault slips under unloading condition in coal mines

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