Improved compound support system for coal mine tunnels in densely faulted zones: A case study of China's Huainan coal field

Kang, Yongshui; Liu, Quansheng; Xi, Hailong; Gong, Guangqing

doi:10.1016/j.enggeo.2018.04.006

Cited by 61 publications

(27 citation statements)

References 22 publications

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“…In-situ stress is a principal element which causes rock deformation and failure, and its magnitude and orientation significantly affect the stability of roadways [23,24]. In order to investigate the in-situ stress of Zhangji coal mine, borehole stress relief measurements were conducted in the mine's roadways by Anhui University of Science and Technology.…”

Section: In-situ Stress Fieldmentioning

confidence: 99%

Supporting Design Optimization of Tunnel Boring Machines-Excavated Coal Mine Roadways: A Case Study in Zhangji, China

et al. 2020

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Tunnel Boring Machines (TBMs) are a cutting-edge excavating equipment, but are barely applied in underground coal mines. For TBM excavation projects involving the Zhangji coal mine, the surrounding rock properties, stress field, cross section geometry, as well as the excavation-induced stress path of TBM-excavated coal mine roadways are different from those of traditional tunnels or roadways. Consequently, traditional roadway supporting technologies and experiences cannot be relied on for this project. In order to research an appropriate supporting pattern for a TBM-excavated coal mine roadway, first of all, the constitutive model of roadway surrounding rocks was derived, and a rock failure criterion was proposed based on rock mechanical tests. Secondly, a three-dimension finite element model was established and computer simulations under three different supporting patterns were conducted. Stress redistribution, roadway convergence, and excavation damage zone ranges of surrounding rocks under three different support patterns were analyzed and an optimal support design of the TBM-excavated roadway was made based on simulation results. During roadway excavation, convergence gauge and rock bolt dynamometers were installed for monitoring roadway convergence and the axial forces of rock bolts. The in-situ monitoring results verified the validity of roadway supporting designs.

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Section: In-situ Stress Fieldmentioning

confidence: 99%

Supporting Design Optimization of Tunnel Boring Machines-Excavated Coal Mine Roadways: A Case Study in Zhangji, China

et al. 2020

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“…[3][4][5][6] Therefore, some compound support technologies were further applied to reduce the large convergence of roadway. 12,13 However, in practice, this method is normally limited by grout diffusion radius, the permeability of surrounding coal mass. 7,8 Considering the rheological properties of soft coal mass, it is quite challenging for maintaining roadway stability by such conventional compound support techniques.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, some successful cases can be found in roadway reinforcement by pregrouting. 12,13 However, in practice, this method is normally limited by grout diffusion radius, the permeability of surrounding coal mass.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation on a novel support system for controlling roadway deformation in underground coal mines

Sun

Zhang

et al. 2019

Energy Science & Engineering

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Roadway stability in extremely soft coal mass is a typical challenge in deep underground mines, as the most widely adopted support structure such as rock bolting, compound support system normally fails. This paper proposed a novel prereinforcement method for coal roadway, that is, jet grouting (JG) technique, to improve the quality of surrounding soft coal mass and form a stable support structure namely jet grouted coalcrete. The field and laboratory tests were conducted for evaluating the applicability of JG and the mechanical parameters of coalcrete. A numerical model was verified by comparing the calculated results with field measurements. According to the confirmed model, three typical JG support schemes were performed to assess the roadway stability after JG. The results showed that the proposed JG schemes can reduce the deformation and failure zone of the roadway and optimize the stress states around the roadway. The mechanism related to these advantages was investigated.This study provides a promising idea for supporting soft coal roadway in deep underground coal mines, which can promote the JG application in the field. K E Y W O R D Scoalcrete, jet grouting technique, numerical modeling, roadway stability, soft coal mass

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“…Roadways are prone to collapse in these adverse geological conditions, and the roadway collapse contributes to 43% fatalities of miners in underground coal mines in China [4,5]. Considering safety issues, the roadway support is playing an increasingly important role in coal mining operations [6]. The rock bolt is one of the most popular supporting materials in underground coal mining due to its installation flexibility and low price [7].…”

Section: Introductionmentioning

confidence: 99%

“…Location and strata histogram of the CBM drainage roadway in Zhangji Coal Mine[23]. Layout of the FBG-based instrumented rock bolt monitoring system 6. Journal of Sensors4.3.…”

mentioning

confidence: 99%

Application of a FBG-Based Instrumented Rock Bolt in a TBM-Excavated Coal Mine Roadway

et al. 2018

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Rock bolts have been widely applied with roadway excavation in underground coal mines to prevent roadway collapse and improve the stability of roadway surrounding rocks. Overloading and failures of rock bolts could result in accidents or casualties in coal mine roadways. Consequently, monitoring axial forces and work conditions of rock bolts plays an increasingly important role in ensuring safe operations of underground coal mines. Conventional mechanical or electronic rock bolt monitoring systems are typically affected by electromagnetic interference, corrosive groundwater, and dusty circumstance in underground working sites. This work proposed a FBG-based instrumented rock bolt. Quasi-distributed FBG sensors were installed on a slotted rock bolt and encapsulated by epoxy resin that was used to fix FBG sensors on the rock bolt and protect FBG sensors from damage. The FBG sensors were calibrated before the in situ application. Monitoring results indicated that the axial forces of rock bolts installed on the roof of the roadway were higher than that of others, and the maximum axial forces of each rock bolt were typically detected near the middle portion of rock bolts. A real-time and accurate rock bolt monitoring system was established by integrating instrumented rock bolts to the existing monitoring system of the coal mine.

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Improved compound support system for coal mine tunnels in densely faulted zones: A case study of China's Huainan coal field

Cited by 61 publications

References 22 publications

Supporting Design Optimization of Tunnel Boring Machines-Excavated Coal Mine Roadways: A Case Study in Zhangji, China

Supporting Design Optimization of Tunnel Boring Machines-Excavated Coal Mine Roadways: A Case Study in Zhangji, China

Experimental and numerical investigation on a novel support system for controlling roadway deformation in underground coal mines

Application of a FBG-Based Instrumented Rock Bolt in a TBM-Excavated Coal Mine Roadway

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