Stability control of gob-side entry retained under the gob with close distance coal seams

Zhang, Zizheng; Deng, Min; Bai, Jianbiao; Yan, Shuai; Yu, Xianyang

doi:10.1016/j.ijmst.2020.11.002

Cited by 72 publications

(42 citation statements)

References 28 publications

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“…The selection of high-water materials has advantages over other materials due to its fast load-bearing characteristics. The mechanical load-bearing properties of high-water materials are discussed in detail in Section 5.1 and are also proven in previous literature [47,48]. In Section 3.2, the variation relationship of the roof subsidence of different backfill barricades spacing is simulated, and the roof subsidence is smaller under the filling barricade spacing of 5~15 m, considering the spacing and row spacing between the columns are both 4 m. Therefore, the spacing of the filling barricade is determined to be 12 m. In addition, the width of the filling barricade is 1.5 m, the maximum distance between the filling barricade and the pillars and the coal mining face is 22.7 m (discussed in Section 3.1.2).…”

Section: Determine the Structure Backfill Mining Parametersmentioning

confidence: 89%

A Method of Backfill Mining Crossing the Interchange Bridge and Application of a Ground Subsidence Prediction Model

et al. 2021

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The traditional backfill mining method is a technology developed by the general trend of green coal mining, but with a high cost and an impact on production efficiency. This paper proposes a structured backfill mining method with high-water materials and pillars. The evolution of roof pressure appearance is assessed through the sensor and monitoring system in the hydraulic support. The main roof fracture step distance is determined based on the roof structure characteristics of backfill mining, and the backfill step distance of underground structural backfill is 22.7 m considering the safety factor. Through the simulation results of Abaqus commercial simulation software, the roof subsidence evolution of different backfill schemes under temporary load and permanent load is compared, and the rationality of the backfill step distance is verified. Based on the probability integral method, the surface subsidence prediction model is proposed, then the final value and the maximum dynamic change value of the surface subsidence at the north and south ends of the interchange bridge by traditional mining and backfill mining are analyzed, which verifies the rationality of the structural backfill mining method.

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Section: Determine the Structure Backfill Mining Parametersmentioning

confidence: 89%

A Method of Backfill Mining Crossing the Interchange Bridge and Application of a Ground Subsidence Prediction Model

et al. 2021

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“…e bottom boundary of the model is fixed in the vertical direction, while the two sides and front-rear boundaries are fixed in the horizontal direction. Using the numerical model parameter modification method of Zhang et al [27,28] and based on the laboratory results, the physical and mechanical parameters of each rock layer in the model are finally determined, as shown in Table 3. e mechanical parameters of the anchor cable are selected from the experimental parameters; that is, the elastic modulus of the anchor is 200 GPa, the diameter is 20 mm, the length is 2.2 m, the breaking load is 180 kN, and the anchoring length is 0.6 m. e diameter of the anchor cable is 17.8 mm, the length is 6.0 m, the breaking load is 400 kN, and the anchoring length is 1.2 m. e roof is arranged with 6 anchor rods with a distance of 800 mm, and the roof is arranged with 2 anchor cables with a distance of 1.8 m.…”

Section: Establishment Of Numerical Calculation Model and Parameters Determinationmentioning

confidence: 99%

Study on the Lagging Support Mechanism of Anchor Cable in Coal Roadway Based on FLAC^3D Modified Model

Wang

et al. 2021

Advances in Civil Engineering

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Aiming at the broken failure of anchor cable in the mining roadway roof during the mining process, the lagging support scheme of anchor cable is proposed. Based on the results of indoor anchor cable pull-out test, the Cable element in FLAC3D is modified to realize the extension breaking of anchor cable in the calculation process. Furthermore, the minimum principal stress and volume strain rate mutation point are used as the failure criteria of the anchor cable. Through the comparative analysis of five anchor cable lagging support schemes of 6208 transport tunnel in Wangzhuang Mine Coal, the results demonstrate that the lagging support reduces the initial support resistance of the supporting structure. With the increase of lagging time, the ability of anchor cable to adapt to deformation increases gradually. When the lagging time reaches the gentle area of roadway deformation, its ability to adapt to deformation remains stable. Finally, it was determined that the support should start at 10–15 m of the anchor cable lagging head of the 6208 transport tunnel. Industrial tests show that the lagging support scheme ensures that the anchor cable can withstand a certain deformation, and the support body has no broken failure, which effectively controls the large mining-induced deformation of surrounding rock.

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“…Model. e redistribution of the underground pressure will result in the development of fissures of surrounding rock, generally associated with the large deformation of the excavated zone [13,14].…”

Section: Setup Of the Numericalmentioning

confidence: 99%

Investigation on Surrounding Rock Stability Control Technology of High Stress Roadway in Steeply Dipping Coal Seam

Liu

Chen

Wang

et al. 2021

Advances in Civil Engineering

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There are a large amount of steeply dipping coal seams deposited in China, the safe and effective extraction of which are the challenge for coal operators due to the complicated geological characteristics, in particular, when the underground roadway is excavated in the steeply dipping coal seams with limited seam distance. The Universal Distinct Element Code (UDEC) was adopted in the present research to explore the stress distribution of surrounding rock of the roadway. Based on the numerical simulation, the damage coefficient was proposed and then used to classify the roof conditions into four groups. After that, the asymmetric support technique was proposed and put into practical applications. It is indicated that the stress concentration on the floor is the main feature of the extraction of steeply dipping coal seams. Moreover, the distributions of the maximum vertical stress and horizontal stress which are much different from each other mainly attributed to the effect of the large dip angle. This research also verified the feasibility of using the asymmetric and partition support technique to maintain the integrity of the surrounding rock, as from the case study conducted at the 12032 longwall coal face of Zhongwei coal mine.

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Stability control of gob-side entry retained under the gob with close distance coal seams

Cited by 72 publications

References 28 publications

A Method of Backfill Mining Crossing the Interchange Bridge and Application of a Ground Subsidence Prediction Model

A Method of Backfill Mining Crossing the Interchange Bridge and Application of a Ground Subsidence Prediction Model

Study on the Lagging Support Mechanism of Anchor Cable in Coal Roadway Based on FLAC^3D Modified Model

Investigation on Surrounding Rock Stability Control Technology of High Stress Roadway in Steeply Dipping Coal Seam

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Stability control of gob-side entry retained under the gob with close distance coal seams

Cited by 72 publications

References 28 publications

A Method of Backfill Mining Crossing the Interchange Bridge and Application of a Ground Subsidence Prediction Model

A Method of Backfill Mining Crossing the Interchange Bridge and Application of a Ground Subsidence Prediction Model

Study on the Lagging Support Mechanism of Anchor Cable in Coal Roadway Based on FLAC3D Modified Model

Investigation on Surrounding Rock Stability Control Technology of High Stress Roadway in Steeply Dipping Coal Seam

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Study on the Lagging Support Mechanism of Anchor Cable in Coal Roadway Based on FLAC^3D Modified Model