A combined supporting system based on foamed concrete and U-shaped steel for underground coal mine roadways undergoing large deformations

Tan, Xianjun; Chen, Weizhong; Liu, Hongyuan; Chan, A. H. C.; Tian, Hongming; Meng, Xinmiao; Wang, Fuqi; Deng, Xiao-lin

doi:10.1016/j.tust.2017.05.023

Cited by 100 publications

(23 citation statements)

References 32 publications

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“…However, recent advances in FC technology have seen their use in applications where a high-performance material is required [2][3][4][5][6][7][8][9][10], e.g., highways, military, civil engineering, and aviation [11][12][13][14][15]. Foam concrete has been successfully used in the backfilling of underground projects such as building compensation foundation treatment, and it can be used to widen the roadbed to effectively reduce differential settlement [16,17]. Unfortunately, FC is not only affected by loading [7], but also the environment.…”

Section: Introductionmentioning

confidence: 99%

Minimizing Drying Shrinkage and Enhancing Impermeability of Foam Concrete Modified with Epoxy Resin

Gong

2020

Advances in Civil Engineering

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Relatively high drying shrinkage and permeability were two of the major challenges associated with foam concrete (FC), primarily due to its high porosity nature. This study was aimed at reducing the drying shrinkage and improving the impermeability of FC by blending and modifying it with epoxy resin (EP). Extensive laboratory testing yielded an optimum content of 4.0% EP, corresponding to a minimum drying shrinkage rate of 1.47 mm/m, which was 48% lower than that of the unmodified FC. At this optimum dosage of 4.0% EP, the permeability pressure was at a maximum level of 1.4 MPa, whereas the permeability coefficient was at its lowest value of 0.75 × 10−9 mm/h. Internal pore structure and EP distribution were characterized using the scanning electron microscopy and indicated that a microgrid structure of the FC was formed internally, featuring an increase in the number of pores, a reduction in the average pore size, and a uniform pore size distribution. Similarly, surface energy measurements using the tensiometry method yielded maximum surface energy values at 4.0% EP content, which could be used to explain the reduced drying shrinkage and the enhanced impermeability characteristics of the modified FC.

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Section: Introductionmentioning

confidence: 99%

Minimizing Drying Shrinkage and Enhancing Impermeability of Foam Concrete Modified with Epoxy Resin

Gong

2020

Advances in Civil Engineering

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“…Researchers have attempted to employ new concepts, materials and technologies to solve the difficulties of a soft rock roadway support [4][5][6][7][8][9]. A representative solution is the use of the concrete-filled steel tubular (CFST) arch support.…”

Section: Introductionmentioning

confidence: 99%

Bearing properties and influence laws of concrete-filled steel tubular arches for underground mining roadway support

Mei

Xiu-ming

et al. 2020

Science and Engineering of Composite Materials

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The concrete-filled steel tubular (CFST) arch is a new high-strength support form for a mine roadway in deep/soft rock stratum; however, the bearing characteristics have not been clearly elucidated for scientifically guiding field applications. Numerical simulation tests with 15 schemes shaped as a ‘half circle with two straight legs’ and 10 schemes shaped as a circle were conducted, and the main responses of the numerical model were verified by performing the laboratory tests to evaluate the basic CFST structures and global CFST arches. The bearing and failure behaviors of the CFST arches were studied, and the influence laws, in terms of the arch shape, size and lateral pressure coefficient λ, were further investigated. The results show that the bearing capacity of a circular arch is significantly higher than that of a straight-leg arch under a uniform load. Furthermore, the bearing capacity of the circular arch decreases considerably with the increase in the arch size or λ. In addition, the bearing capacity of a straight-leg arch decreases with the increase in the leg height and arch size; however, it first increases and later decreases with the increase in λ. The failure modes of all the arches correspond to the instability at the extreme point caused by the strength deterioration, except in the case of a circular arch under a uniform pressure, the failure mode of which corresponds to the instability at the branch points. Finally, the recommendations for the field practice are proposed and verified.

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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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A combined supporting system based on foamed concrete and U-shaped steel for underground coal mine roadways undergoing large deformations

Cited by 100 publications

References 32 publications

Minimizing Drying Shrinkage and Enhancing Impermeability of Foam Concrete Modified with Epoxy Resin

Minimizing Drying Shrinkage and Enhancing Impermeability of Foam Concrete Modified with Epoxy Resin

Bearing properties and influence laws of concrete-filled steel tubular arches for underground mining roadway support

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

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A combined supporting system based on foamed concrete and U-shaped steel for underground coal mine roadways undergoing large deformations

Cited by 100 publications

References 32 publications

Minimizing Drying Shrinkage and Enhancing Impermeability of Foam Concrete Modified with Epoxy Resin

Minimizing Drying Shrinkage and Enhancing Impermeability of Foam Concrete Modified with Epoxy Resin

Bearing properties and influence laws of concrete-filled steel tubular arches for underground mining roadway support

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