A novel conceptual model of fracture evolution patterns in the overlying strata during horizontal coal seam mining

Shi, Longqing; Xu, Dongjing; Wang, Ying; Qiu, Mei; Jiang, Hao

doi:10.1007/s12517-019-4486-x

Cited by 23 publications

(11 citation statements)

References 21 publications

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“…These researches revealed that the floor‐strata strain turns from tensile to compression with mining depths increasing . Second, quick‐setting high‐water materials with constant resistance features and paste materials with high strength and low costs were developed to construct roadside backfill. Compared with traditional wooden stacks, intensive individual props, gangue bags, and concrete blocks, these new materials have greater resistance, faster increasing‐resistance, higher filling efficiency, and better sealing effects .…”

Section: Introductionmentioning

confidence: 99%

An innovative approach for gob‐side entry retaining in deep coal mines: A case study

Fan

Liu

Tan

et al. 2019

Energy Science & Engineering

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Due to the complex geostress and mining conditions in the coal seam with depth of 800 m, stability of surrounding rock for gob‐side entry retaining is very difficult to achieve. In this paper, we firstly propose an innovative bolt‐grouting controlled roof‐cutting for gob‐side entry retaining (BCR‐GER) approach for deep coal mines. Secondly, a mechanical model of “surrounding rock‐supporting body” for BCR‐GER is constructed, which consists of coal wall, roadside props, and gangues in gob (the whole supporting body). Thirdly, the key parameters (ie, cutting height, cutting angle, grouting cable length, and row of roadside props) are designed. Finally, field practice was applied at the No. 31120 haulage roadway of the Suncun coal mine in China, and in situ investigations were conducted for verification. Field measurement results show that maximum convergences of roof‐to‐floor and side‐to‐side were 264 mm and 113 mm, respectively. What is more, the maximum support resistance of roadside props was reduced by approximately 58%. The deformation and failure of surrounding rock were effectively controlled, and the pressure on roadside props was greatly reduced. This research fully considers the bearing properties of gangues in gob, eliminates the secondary disasters caused by borehole blasting, and provides guidance and reference for deep surrounding rock control of the same or similar gob‐side entry.

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Section: Introductionmentioning

confidence: 99%

An innovative approach for gob‐side entry retaining in deep coal mines: A case study

Fan

Liu

Tan

et al. 2019

Energy Science & Engineering

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“…According to the theory of the trapezoidal broken model established by Xu et al [11,30,31], the fracture patterns in massive strata controlled by the volume expansion coefficient were obtained, and the consequent fracture parameters were calculated to investigate the fracture formation mechanism in the overburden strata due to caving caused by coal mining. In this model, a series of parallelogram fractures were produced at both ends of the trapezoidal broken model (Figure 1), and each parallelogram was defined by its long side (a), short side (b), height (h), area (S), and dip inclination (α) [11].…”

Section: Sample Geometry and Preparationmentioning

confidence: 99%

Effects of Flaw Geometry on the Fracturing Behavior of Rock‐Like Materials Containing Two Arch‐Like Parallelogram Flaws

Shi

2020

Advances in Civil Engineering

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To increase understanding of the strength and failure mechanism of rocks with arch-like fractures generated in the overlying strata above a gob during coal mining, a series of uniaxial compression tests on rock-like specimens containing two preexisting parallelogram flaws at inclination angles varying from 45° to 75° were made using a rock mechanics servocontrolled testing system. Based on the experimental results, the effects of the inclination angles of two flaws having the same area on the mechanical parameters and fracturing process of the specimens were analyzed in detail. By adopting photographic monitoring, the crack initiation, propagation, coalescence, and failure modes in rock-like specimens were observed and characterized. The crack initiation stress and the second initiation stress were distinctly related to the flaw inclination angles, although the crack initiation stress presented a change trend generally similar to that of the crack second initiation stress with increasing flaw angle. Four modes of ultimate macroscopic failure morphology and the crack coalescence and failure modes of three types could be summarized. The research reported here could provide some theoretical support for the arch-like fracture evolution in the overburden during the excavation in underground engineering, especially in coal mining engineering.

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“…The groundwater geochemistry of an area is a highly complex and dynamic (Adhikari and Mal, 2019), and the hydrochemical parameters can quantitatively reflect the properties of aquifers. Hydrogeochemical differences occur due to natural environmental processes by means of recharge and discharge, rock-water interaction, flow pattern, and residence times (Liu et al, 2018; Mu et al, 2018; Shi et al, 2019b). After accidental water inrush, it is crucial to quickly identify the water inrush source, find out the cause of the accident, and find mitigation strategies (Shi et al, 2019a; Song et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Source identification of mine water inrush based on the exponential whitenization function and the grey situation decision model

Wang¹,

Wang³

et al. 2022

Energy Exploration & Exploitation

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Coal mining at deep levels can cause mine water inrush and groundwater contamination, making it important to accurately and rapidly identify the water inrush source. In this study, 52 water samples were extracted from three types of aquifers in the Linhuan mining area, China. The water sample components Na+ + K+, Ca2+, Mg2+, HCO3−, Cl−, and SO42−, measured in the experiment, were used as evaluation variables, and the piecewise function equation was established by using the exponential whitening function. Finally, combined with water sample data and the CRITIC weighted grey situation decision-making method, the comprehensive membership degree was obtained, and the water inrush source was identified according to the principle of the maximum membership degree. The comprehensive accuracy of the model was 92.3%. The traditional grey situation decision-making method uses the linear whitening function to determine the membership value, ignoring that the value of the whitening function outside the adjacent level is 0, which improves the weight of the adjacent level, causes the loss of effective information, and reduces the discrimination rate. The exponential whitenization function in this paper will solve this problem and further improves the grey situation decision-making method to discriminate the water inrush source, which would also be beneficial regarding the prevention and control of mine water inrush and groundwater contamination.

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A novel conceptual model of fracture evolution patterns in the overlying strata during horizontal coal seam mining

Cited by 23 publications

References 21 publications

An innovative approach for gob‐side entry retaining in deep coal mines: A case study

An innovative approach for gob‐side entry retaining in deep coal mines: A case study

Effects of Flaw Geometry on the Fracturing Behavior of Rock‐Like Materials Containing Two Arch‐Like Parallelogram Flaws

Source identification of mine water inrush based on the exponential whitenization function and the grey situation decision model

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