Practices, experience, and lessons learned based on field observations of support failures in some Chinese coal mines

Feng, Xiaowei; Zhang, Nong; Xue, Fei; Xie, Zhengzheng

doi:10.1016/j.ijrmms.2019.104097

Cited by 48 publications

(33 citation statements)

References 37 publications

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“…Therefore, S3 contributes more X displacement and less Y, and Z displacement along the plane (S1 and S2 have the same mechanism with S3). This conclusion can be used to explain many collapse events in other mining areas (Feng et al 2019;Waltham et al 2011).…”

Section: Temporal Pattern Of Sourcementioning

confidence: 88%

Source and pattern identification of ground deformation based on the framework of Blind Source Separation--Nonnegative Matrix Factorization: a case study in a long-term GPS monitoring mine

Gu¹,

Ma²,

Lin³

et al. 2021

Preprint

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Ground deformation caused by mining affects the safety of underground mining and buildings. High-resolution characterization of ground deformation respond to latent sources is a first step toward improved hazard forecasting. We rely on long-term GPS displacement data and an improved NMF algorithm of BSS to identify the sources driving ground deformation. The NMF identifies three sources (S1, S2, and S3) with distinct spatial and temporal surface deformation patterns and quantitatively reveals the contribution of each source to ground deformation. S1 captures horizontal Y-displacement related to horizontal tectonic stress \({{\sigma }}_{1}\). S2 dominates vertical Z-displacement with a widespread isotropous deformation driven by self-weight body force. S3 controls horizontal X-displacement related to horizontal tectonic stress \({{\sigma }}_{2}\). Besides, we find that independent contributions of these three sources can be resolved from the GPS data. The results show that the sharp change of source contribution and even transformation of dominate source are highly related to the severe deformation belt. This phenomenon is time independent, and helps us to select sites and find the potential risk area at its early stage.

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Section: Temporal Pattern Of Sourcementioning

confidence: 88%

Source and pattern identification of ground deformation based on the framework of Blind Source Separation--Nonnegative Matrix Factorization: a case study in a long-term GPS monitoring mine

Gu¹,

Ma²,

Lin³

et al. 2021

Preprint

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“…To solve the problem of deep mining is to consider the future of coal mining. The problem of deep buried and high stress roadway support is one of the major technical problems in deep mining [5,6]. Under the action of deep buried high stress, the difficulties faced by roadway support increase sharply [7].…”

Section: Introductionmentioning

confidence: 99%

Long High-Performance Sustainable Bolt Technology for the Deep Coal Roadway Roof: A Case Study

et al. 2020

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High-efficiency maintenance and control of the deep coal roadway roof stability is a reliable guarantee for safe production and sustainable development of a coal mine. With belt haulage roadway 3108 in MenKeqing coal mine as the research background, in situ investigation, theoretical analysis, numerical simulation, and engineering practice were carried out to reveal the law of improving the bearing state of bolts by increasing the thickness of the roof anchoring layer. Also, the mechanism of the high-efficiency and long anchoring of the roof is revealed. Results show that increasing thickness of the roof anchorage layer could mobilize deep rock mass to participate in the bearing and promote the bolt to increase the resistance in a timely manner to limit the deformation of rock mass. Through the close link between shallow soft rock mass and deep stable rock mass, the deformation of the shallow rock mass is well controlled and so are the development and expansion of the roof separated fissures from shallow to deep. Long high-performance sustainable bolt technology for roof are proposed and carried out to control the stability of the deep roadway roof. Engineering practice indicates that deformations of roof could be efficiently controlled. The maximum deformations of the roof and sidewall-to-sidewall are 17 mm and 24 mm, respectively. No obvious separation fissures are found in the anchoring range of roof. This study provides a reference for roof stability control of deep roadway under similar conditions.

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“…Many researches have proven the effectiveness of the mesh from varied perspectives (Feng et al, 2019;Mohamed et al, 2016;Hebblewhite and Galvin, 2017;Heritage, 2019), and a comprehensive supporting scheme that consists of a mesh, strap, face plate, and bolt has been completely acknowledged (Kang et al, 2015;Tan et al, 2017;Zhang et al, 2018;Peng, 2015). Therefore it is widely believed that the rock mass can be stabilized by (Rahimi et al, 2019) using the intrinsic self-stability of the rock mass with assistance from arti cial support elements; in most circumstance, support failures in coal mine roadways can be avoided.…”

Section: Introductionmentioning

confidence: 99%

Failure Characteristics of W Straps Based on Field Observations and Laboratory Tests 

Feng

Xue

Wang

2020

Preprint

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W straps are important surface supporting components. When they cooperate properly with inner supporting components, such as rock bolts and cable bolts, they can enhance the supporting effects and bridging bolting units with integrity. Unfortunately, relevant studies regarding this topic have not been extensively reported. In this study, the failure characteristics of the W strap in the field are discussed and different types of distortion are proposed. Followed by the detailed failure patterns of the strap, a possible mechanism and solution are hypothetically put forward, which are then both numerically and experimentally verified. Afterwards, a loading apparatus capable of examining the mechanical behaviours of the strap is designed, which can similarly recreate the loading environment of the strap to the situation in the engineering field. By virtue of the designed loading device, a series of failure patterns of the bolting system are presented, and the distortion degree of the strap is evaluated using a 3D scanning method. The major findings in this study are as follows: 1) a domed face plate is better than a square domed face plate; 2) the existence of a hole beneath the strap in engineering applications can easily induce failure; and 3) cracked but compacted gravel-like roof strata beneath the strap may not cause damage to the strap-bolt supporting system. These ideas present new understandings in terms of the working conditions of W straps in coal mine roadway supporting systems, and the results can be referred to by practitioners.

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Practices, experience, and lessons learned based on field observations of support failures in some Chinese coal mines

Cited by 48 publications

References 37 publications

Source and pattern identification of ground deformation based on the framework of Blind Source Separation--Nonnegative Matrix Factorization: a case study in a long-term GPS monitoring mine

Source and pattern identification of ground deformation based on the framework of Blind Source Separation--Nonnegative Matrix Factorization: a case study in a long-term GPS monitoring mine

Long High-Performance Sustainable Bolt Technology for the Deep Coal Roadway Roof: A Case Study

Failure Characteristics of W Straps Based on Field Observations and Laboratory Tests

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Practices, experience, and lessons learned based on field observations of support failures in some Chinese coal mines

Cited by 48 publications

References 37 publications

Source and pattern identification of ground deformation based on the framework of Blind Source Separation--Nonnegative Matrix Factorization: a case study in a long-term GPS monitoring mine

Source and pattern identification of ground deformation based on the framework of Blind Source Separation--Nonnegative Matrix Factorization: a case study in a long-term GPS monitoring mine

Long High-Performance Sustainable Bolt Technology for the Deep Coal Roadway Roof: A Case Study

Failure Characteristics of W Straps Based on Field Observations and Laboratory Tests&nbsp;

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Failure Characteristics of W Straps Based on Field Observations and Laboratory Tests