On the strong earthquakes induced by deep coal mining under thick strata-a case study

Jiao, Yu‐Yong; Wu, Kunbo; Zou, Junpeng; Zheng, Fei; Zhang, Xiufeng; Chao, Wang; Li, Xiang; Zhang, Chen

doi:10.1007/s40948-021-00301-1

Cited by 29 publications

(14 citation statements)

References 32 publications

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“…Horizontal directional drilling (HDD) is a trenchless, pipe-laying technology that uses anchored drilling equipment to drill into the ground at a small angle of incidence relative to the ground surface, which forms a pilot hole. It then resizes the pilot hole to the required size and loads the pipe (line) into the hole by back-dragging and the traction of the drilling rig [3,17]. is technology is widely used in municipal, oil, and gas projects and other pipeline construction industries, and it has the advantages of fast construction speed, low cost, and minimal environmental disturbance as compared with other trenchless pipe-laying technologies [18,19].…”

Section: Horizontal Directional Drilling Geological Surveymentioning

confidence: 99%

“…erefore, it is important to carry out research on the prediction of groundwater in ow in tunnels. Many domestic and foreign scholars have carried out research on the prediction of tunnel groundwater in ow using empirical calculations, analytical solutions, numerical analyses, and other methods to calculate tunnel groundwater in ow [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

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Predicting Tunnel Groundwater Inflow by Geological Investigation Using Horizontal Directional Drilling Technology

Liu

2022

Advances in Civil Engineering

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To improve the prediction accuracy of tunnel excavation groundwater inflow, a prediction method based on a horizontal directional drilling geological survey is proposed. It relies on the monitoring and statistical analysis of groundwater inflow into a horizontal directional drilling survey borehole. Moreover, it is based on Goodman’s empirical back-calculation for the surrounding rock penetration coefficient and uses the groundwater dynamics method to predict the amount of inflow into the tunnel excavation. On the basis of an analysis of the Tianshan Shengli Tunnel, the following conclusions were obtained: the tunnel excavation groundwater inflow prediction method based on a horizontal directional drilling geological survey borehole can be used to obtain the permeability coefficient value of the surrounding rock, which can be used in the groundwater dynamics method to improve the prediction accuracy; the groundwater runoff modulus method and the atmospheric precipitation infiltration method underestimate the prediction results for tunnel groundwater inflow; and the groundwater dynamics calculation results based on the horizontal survey hole prediction method are more reliable. Goodman’s empirical formula was used to predict normal groundwater inflow within the 2,271 m length from the tunnel entrance: the normal groundwater inflow into the right tunnel was approximately 6,441 m3/d, and the maximum groundwater inflow was approximately 19,323 m3/d. When the tunnel crosses the fault zone, the groundwater inflow increases significantly. The normal groundwater inflow per unit footage is approximately 7.30 m3/(d·m), and the portion of the tunnel that crosses the fault zone is a medium to strong water-rich section.

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Section: Horizontal Directional Drilling Geological Surveymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Predicting Tunnel Groundwater Inflow by Geological Investigation Using Horizontal Directional Drilling Technology

Liu

2022

Advances in Civil Engineering

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“…Shear slip often occurs in high strata, which leads to large-energy mine seismicities. A large mine seismicity will be caused by the synergistic rupture of multi-layer hard rock (He et al, 2015;Jiao et al, 2021). After rock fracture, the contact behavior is controlled by the asperity when the working face is disturbed again by the external force.…”

Section: Introductionmentioning

confidence: 99%

Study on the Mechanism of Weakening Thick and Hard Roof by Deep-Hole Blasting in Deep Coal Mines

Zhang

Zou²,

Zhang³

et al. 2022

Front. Earth Sci.

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In the mining process of deep coal mines with a thick and hard roof, it is easy to form a large overhanging roof and accumulate a lot of strain energy. The sudden breaking of the suspended roof may induce seisms, which seriously threaten the safety of underground miners and equipment. To reveal the mechanism of weakening the thick and hard roof by blasting in deep mining, the four times deep-hole blasting in 63upper06 panel of Dongtan coal mine are considered. First, the temporal and spatial distribution of seismicity events monitored before and after blasting is investigated. Second, the process of deep-hole blasting is simulated using finite element and discrete element methods. After blasting, the small-energy mining-induced seismicities within 20 m of the roof suddenly increase and gradually transfer to the mined-out area and the front of the working face. Meanwhile, the high rock stratum is broken and a large amount of strain energy is released, which causes the range of fall zone enlarge a lot, and the stress in the roof is decreased obviously. With the increase in the number of deep-hole blasting, the pressure relief effect becomes more obvious, and the newly developed fracture is mainly located in the low strata. Microseismic monitoring results agree with the calculated results. Moreover, the rock caving steps are easily formed after deep-hole blasting, and the collapse is more sufficient. Furthermore, blasting cracks are most restrained in the vertical direction of the maximum principal stress. Moreover, the delayed blasting method is more conducive to the expansion and penetration of blasting cracks. Results show that the deep-hole blasting technology has a significant effect on weakening the roof of coal seam and preventing and controlling large-energy mining-induced seismicities.

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“…ese fractures are interconnected and act as pathways for nuclides to migrate to the biosphere. erefore, it is a key scienti c problem to study the e ect of hightemperature heat treatment on the evolution of microstructure and seepage characteristics of low permeability rocks [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Gas Permeability Semiempirical Model of Granite after Heat Treatment

2022

Advances in Civil Engineering

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High temperature will cause a thermal crack of a rock, thus affecting the permeability change of rock. To explore the effects of temperature on permeability and microstructure of rock microstructure, the granite after 50–800 C thermal treatment was carried out by gas permeability test, combined with computed tomography (CT) scanning technology. The granite internal three-dimensional reconstruction was conducted after high-temperature thermal treatment, and the characteristics of the microstructure were also deeply analyzed. On this basis, the applicability of the Costa model under high temperature was discussed. Finally, the temperature-permeability model of granite after the high temperature was proposed combined with the pore fractal model. The new model was verified with experimental data.

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On the strong earthquakes induced by deep coal mining under thick strata-a case study

Cited by 29 publications

References 32 publications

Predicting Tunnel Groundwater Inflow by Geological Investigation Using Horizontal Directional Drilling Technology

Predicting Tunnel Groundwater Inflow by Geological Investigation Using Horizontal Directional Drilling Technology

Study on the Mechanism of Weakening Thick and Hard Roof by Deep-Hole Blasting in Deep Coal Mines

Experimental Study on Gas Permeability Semiempirical Model of Granite after Heat Treatment

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