Dynamic disaster control under a massive igneous sill by grouting from surface boreholes

Xuan, Dayang; Xu, Jialin; Zhu, Weibing

doi:10.1016/j.ijrmms.2014.06.019

Cited by 42 publications

(38 citation statements)

References 7 publications

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“…3 However, if the target horizon of the injection is the gob area, the grouting is generally implemented by drilling boreholes into the mined-out areas following the extraction. 17 It is clear from the above process that to achieve borehole sharing, the timing and the targeted vertical horizons for the drainage and injection must be coordinated. Regarding timing, the grout injection should be preceded by gas drainage because of mining safety issues (i.e., to minimize overlying gas emission into the underground longwall face).…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…15,16 Although these two methods are widely used in mining engineering, they cannot control subsidence and gas leakage in some longwall panels that require control of both hazards, for example, in longwall panels that lie beneath high-gas seams and a massive stratum, as in the case presented in Section 3. As longwall extraction below a massive bed may cause widespread and sudden subsidence (even some time after mining), ground stabilization is essential during longwall mining 17,18 (e.g., using grout injection 17 ).…”

Section: Introductionmentioning

confidence: 99%

“…Thus far, two technical modes of grout injection have been described for longwall panels: injection during mining 2 and injection following mining. 17,19,20 Both techniques focus only on ground stabilization rather than on gas control. The former mode is used for active longwall panels and is the best injection technique for controlling surface subsidence; thus, it is the most commonly used mode.…”

Section: Introductionmentioning

confidence: 99%

“…The other mode-injection following mining, which is for abandoned longwalls only-allows effective drainage of overburden seam gas, but is generally applied as a remedial measure for ground stabilization (i.e., mitigation of further residual subsidence). 17,20 Additionally, the target zones for injection and drainage are generally located in different vertical horizons; therefore, neither of these two injection modes can be combined in a longwall panel in which overlying seam gas needs to be drained.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A shared borehole approach for coal-bed methane drainage and ground stabilization with grouting

Xuan

Wang

2016

International Journal of Rock Mechanics and Mining Sciences

Self Cite

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Section: Theoretical Backgroundmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A shared borehole approach for coal-bed methane drainage and ground stabilization with grouting

Xuan

Wang

2016

International Journal of Rock Mechanics and Mining Sciences

Self Cite

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“…With the increasing mining depth of coal mines, intrusive igneous rock is usually found around roadways and in the overlying strata above mining stopes [5]. Influenced by the multiple human mining activities and the natural shock and vibrations of earthquake, the hard igneous rock would suddenly break, instantly releasing a tremendous amount of elastic strain energy, which will easily induce the occurrence of complex dynamic disasters, such as rock bursts, water inrush, and gas outbursts [6][7][8][9][10]. The dynamic disasters in coal mines caused by the intrusive igneous rock impact the safety and productivity of the coal mines.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Mechanical Behavior of Dry and Water Saturated Igneous Rock with Acoustic Emission Monitoring

Guo

Feng

et al. 2018

Shock and Vibration

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The uniaxial cyclic loading tests have been conducted to study the mechanical behavior of dry and water saturated igneous rock with acoustic emission (AE) monitoring. The igneous rock samples are dried, naturally immersed, and boiled to get specimens with different water contents for the testing. The mineral compositions and the microstructures of the dry and water saturated igneous rock are also presented. The dry specimens present higher strength, fewer strains, and rapid increase of AE count subjected to the cyclic loading, which reflects the hard and brittle behavior and strong burst proneness of igneous rock. The water saturated specimens have lower peak strength, more accumulated strains, and increase of AE count during the cyclic loading. The damage of the igneous rocks with different water contents has been identified by the Felicity Ratio Analysis. The cyclic loading and unloading increase the dislocation between the mineral aggregates and the water-rock interactions further break the adhesion of the clay minerals, which jointly promote the inner damage of the igneous rock. The results suggest that the groundwater can reduce the burst proneness of the igneous rock but increase the potential support failure of the surrounding rock in igneous invading area. In addition, the results inspire the fact that the water injection method is feasible for softening the igneous rock and for preventing the dynamic disasters within the roadways and working faces located in the igneous intrusion area.

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Mining stress formation and distribution: Predictive model based on overburden key strata structure

Han,

Hu,

Liu

et al. 2024

Energy Science & Engineering

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In coal mines, the effective extraction of relief gas and the prevention of dynamic disasters depend on accurate predictions of the spatial distribution of mining stress in the overlying rock. However, at present, the prediction of stress relief and concentration zones based on operational experience or empirical modeling differs significantly from actual measurements in the field. The fundamental problem is the difficulty in modeling the transfer mechanism of the mining overburden load under the influence of key strata. In this study, a mechanical model of the spatial distribution of the mining stress field based on the structure of overburden key strata was established. The model demonstrates that the key strata are the main bearing bodies of the overlying rock, both before and after the fracture, and the overburden rock load can be transferred to the coal and rock mass around the stope through the key strata in the fracture and bending subsidence zones, thus forming a mining stress field. Equations for calculating the plane distributions of mining stress under the key strata at different horizons and abutment pressures on the stope were established, and a spatial distribution prediction method for the mining stress field based on the overburden key strata structure was proposed. The study area was the Gaojiapu Coal Mine, where it was found that the key stratum of the 400.45 m thick Luohe Formation sandstone bore most of the overlying rock load and transferred the load to the coal and rock mass around the stope. This load distribution is the root cause of a high concentration and wide influence range of mining stresses, leading to serious deformation of the main roadway and frequent dynamic disasters. The mining stress concentration was maximized at a mining length of 1458 m × 1458 m.

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Dynamic disaster control under a massive igneous sill by grouting from surface boreholes

Cited by 42 publications

References 7 publications

A shared borehole approach for coal-bed methane drainage and ground stabilization with grouting

A shared borehole approach for coal-bed methane drainage and ground stabilization with grouting

Dynamic Mechanical Behavior of Dry and Water Saturated Igneous Rock with Acoustic Emission Monitoring

Mining stress formation and distribution: Predictive model based on overburden key strata structure

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