Study on the Mechanical Properties and Mechanical Response of Coal Mining at 1000 m or Deeper

Xie, Heping; Gao, Mingzhong; Zhang, Ru; Peng, Gaoyou; Wang, Wenyong; Li, Anqiang

doi:10.1007/s00603-018-1509-y

Cited by 214 publications

(91 citation statements)

References 17 publications

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“…The Hongqinghe coal mine is located in the Inner Mongolia province of China, and was the location used for this experiment. Its designed production capacity is 15 Mt/a and the mine field covers 140.7598 km 2 . The LW 3 −1 101 was 3212 m long and 245 m wide, the coal thickness was 6.2 m, and the dip was 1-7 • .…”

Section: Geological Conditionsmentioning

confidence: 99%

“…With the gradual depletion of shallow coal resources, the exploitation of resources extends from shallow to deep resources, where the properties of the rocks change substantially. Under the conditions of high ground stress and mining disturbance, mining-induced strata breakage is more severe and the structural characteristics of KS differ substantially from those in shallow mining [1][2][3][4][5]. At the same time, under the abutment pressure, a series of disasters are encountered on retreated entry and auxiliary entry, such as rib spalling, roof collapse, and coal bump [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Directional Blasting Fracturing Technology for the Stability Control of Key Strata in Deep Thick Coal Mining

et al. 2019

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Under the conditions of high ground stress and mining disturbance, the strata breakage that is induced by mining is severe. Thus, it is critical to investigate the structural characteristics of key strata (KS) in deep thick mining. This study introduces an innovative technology, namely, directional blasting fracturing, in which an energy-gathering tube is installed in a borehole and an explosive is detonated to break the roof in a specified direction. A theory of balanced bulk filling is established based on the requirements of developing a voussoir beam structure, which can be used to effectively evaluate the percentage of bulk filling in gob and to determine to which structure the key strata belongs. Based on this theory, two types of novel structural models in the advancing and lateral directions of the longwall face are established and defined for studying the roof fracturing mechanism. Compared with a cantilever structure, Model C can develop a stable voussoir beam structure, limiting the rotation space of the KS and reducing both the peak abutment pressure and the dynamic disturbance time in the advancing of the longwall face. Model E is defined as when the technology of directional blasting fracturing effectively cuts a stress transfer path into the barrier pillar. The peak abutment pressures on the barrier pillar and auxiliary entry are smaller, and the dynamic disturbance time is shorter, which can effectively improve the stability of the auxiliary entry. The key parameters of directional blasting fracturing are designed and constructed, and they include the roof fracturing height, angle, and charge structure. The field application performance of this innovative technology at the longwall face of 3−1101 in Hongqinghe coal mine was evaluated by analyzing the chock pressure stress, the pillar pressure stress, and the deformation of the auxiliary entry during mining, which lays a foundation for the application of this technology in coal mines in China.

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Section: Geological Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Directional Blasting Fracturing Technology for the Stability Control of Key Strata in Deep Thick Coal Mining

et al. 2019

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“…Specifically, the time-dependent feature of rock mass (i.e. rheology property) in deep conditions is more severe [3,4]. After roadway excavation, the deformation of the roadway with weak rock mass and soft coal mass rapidly increases with time, which causes the evolutionary failure of the roadway.…”

Section: Introductionmentioning

confidence: 99%

Failure Mechanisms of Rheological Coal Roadway

Sun

Zhang

et al. 2020

Sustainability

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The roadway instability in deep underground conditions has attracted constant concerns in recent years, as it seriously affects the efficiency of coal mining and the safety of personnel. The large rheological deformations normally occur in deep roadway with soft coal mass. However, the failure mechanism of such roadways is still not clear. In this study, based on a typical soft coal roadway in the field, the in-situ measurements and rock mass properties were obtained. The rheological deformation of that roadway was revealed. Then a time-dependent 3D numerical model was established and verified. Based on the verified model, the deformation properties and evolutionary failure mechanism of deep coal roadway were investigated in detail. The results showed that the deformation of the soft coal roadway demonstrated rheological behavior and the applied support structures failed completely. After roadway excavation, the maximum and minimum stresses around the roadway deteriorated gradually with the increase of time. The failure zones in soft coal mass expanded increasingly over time, which had a negative effect on roadway stability in the long-term. According to the findings, helpful suggestions were further presented to control the rheological deformation in the roadway. This research systematically reveals the instability mechanism of the deep coal roadway and provides some strategies for maintaining roadway stability, which can significantly promote the sustainability of mining in deep underground coal mines.

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“…Ensuring the long-term stability of the roadway is a quite challenging task in deep coal mines, although recent advances in support systems have been presented and utilized [2][3][4][5]. Experience and engineering practice have proven that roadway stability is closely related to the time-dependent behavior of the surrounding rock mass [6][7][8]. Normally, the time-dependent deformation of the rock mass is called rheology.…”

Section: Introductionmentioning

confidence: 99%

Stability Control for the Rheological Roadway by a Novel High-Efficiency Jet Grouting Technique in Deep Underground Coal Mines

Sun

Zhang

et al. 2019

Sustainability

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In maintaining the efficiency of coal mining, the stability of roadway plays a significant role, as it is closely related to the production of coal and the safety of personnel. In deep underground coal mines, the rheological deformation of roadway normally occurs, which affects its service life. To address this problem, in this paper, a novel high-efficiency Jet Grouting (JG) technique was presented, and its control effect on roadway stability was investigated. A creep test of a coal specimen in a laboratory scale was performed, and its creep behavior was revealed. The rheology of the coal mass surrounding the roadway was further analyzed according to the field-monitoring results of roadway deformation. A time-dependent numerical model with a Burger-creep visco-plastic model (CVISC) was established and validated by comparing the calculated displacement with in-situ measurement. The JG technique was tested in the field, and its applicability and practicability were confirmed. According to the validated model and field test results of JG, a numerical model with CVISC by JG support was established to analyze the effect of JG on the roadway. The results showed that the JG support can effectively reduce roadway deformation, optimize stress conditions, and reduce the extent of the plastic zone around the roadway. The rheological properties of the soft coal roadway were constrained and long-term stability was ensured. This pioneering work can guide the application of JG for the stability control of roadways and promote the sustainability of coal mining efficiently.

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Study on the Mechanical Properties and Mechanical Response of Coal Mining at 1000 m or Deeper

Cited by 214 publications

References 17 publications

Directional Blasting Fracturing Technology for the Stability Control of Key Strata in Deep Thick Coal Mining

Directional Blasting Fracturing Technology for the Stability Control of Key Strata in Deep Thick Coal Mining

Failure Mechanisms of Rheological Coal Roadway

Stability Control for the Rheological Roadway by a Novel High-Efficiency Jet Grouting Technique in Deep Underground Coal Mines

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