Stability Control of Overburden and Coal Pillar in the Gob-Side Entry Under Dynamic Pressure

Wang, Meng; Xu, Yalong; Xu, Qin; Shan, Chengfang; Li, Zhenhua; Nan, Hua; Li, Yafeng; Liu, Honglin; Chu, Tingxiang

doi:10.2139/ssrn.4296781

Cited by 3 publications

(3 citation statements)

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“…Wang 13 constructed a stress model of the overlying strata and coal pillars in the mine-out area and put forward a combined support technique, i.e. "deep-hole-blast roof cutting coupled with grouting-cable reinforcement".…”

Section: Introductionmentioning

confidence: 99%

Technique and practice of surrounding rock control for the roadway driven under the goafs of small collieries and heading for adjacent advancing face

Niu,

Wang,

Wang

et al. 2024

Preprint

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Aiming at the problems of complex stress and large deformations in the surrounding rocks of the roadway driven under the goafs of small collieries and heading for adjacent advancing coal face, by numerical modeling and field practice, the failure characteristics of the overlying coal and rocks were investigated, and the stopping and resuming times of the roadway excavation were identified. A zoning-based reinforcement technique was put forward and applied in engineering practice. The results showed that (1) The roadway roof was divided into four zones: “solid coal zone”, “residual pillar zone”, “roof caved zone”, and “roof un-caved zone”. (2) It was determined that the roadway excavation was stopped when the unmined distance between the return airway face and the 32101 working face was 70 m. After the 32101 working face passed the return airway face by 90 m, the roadway driving was restarted. (3) I.e. cable reinforcement for the “residual pillar zone” and bolt-wire mesh-cable-shotcreting-groutingreinforcement for the “roof failure zone” (“roof caved zone” + “roof un-caved zone”). The field observation results indicated that the maximum amount of the roof-to-floor convergence and the wall-to-wall convergence was 97 mm and 69 mm, respectively, which ensured the safety of roadway excavating.

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Section: Introductionmentioning

confidence: 99%

Technique and practice of surrounding rock control for the roadway driven under the goafs of small collieries and heading for adjacent advancing face

Niu,

Wang,

Wang

et al. 2024

Preprint

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show abstract

“…He Manchao et al [7] proposed a long and short cantilever beam structure model in view of the excessive additional stress caused by excessive cantilever structure in surrounding rock of goaf roadway under dynamic pressure, and realized the purpose of transforming a long cantilever beam into a short cantilever beam by using the top-cutting pressure relief technology. Wang Meng et al [8] based on the masonry beam theory, analyzed the stability characteristics of roadway and coal pillar in the process of overburden rotation and subsidence of gob roadway, and proposed the coordinated control technology of top-cutting pressure relief and asymmetric support.…”

Section: Introductionmentioning

confidence: 99%

Research on Roof Cutting and Pressure Relief Technology of Deep Hole Pre-cracking Blasting

Qin,

Zhu

2024

IJE

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The dynamic pressure gob-side entry is affected by the whole mining process of the working face, and the cause of the large deformation is the additional stress generated during the rotary sinking process of the key block. Therefore, in order to alleviate the deformation of surrounding rock of roadway along goaf. The deep hole pre-splitting blasting roof cutting pressure relief method is used to relieve the pressure of the test roadway. In this study, finite element and discrete element models were established by means of numerical simulation and theoretical analysis, and the law of influence of cutting top height and Angle on roof cutting effect is studied. The optimal cutting height and angle are 15 m and 10° towards the gob, respectively. The industrial test results show that the deformation of surrounding rock of the test roadway is controlled within a reasonable range after pressure relief, and the roadway section meets the production demand.

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“…Many scholars have carried out a great deal of research on the characteristics, mechanism, and control of roadway floor heave. For example, Wang Zhiqiang et al [3], Jiang Donghai et al [4], Zhao Hongbao et al [5], Wang Peng et al [6], Jia Housheng et al [7], and Yang Renshu et al [8] revealed the mechanism of asymmetric floor heave characteristics by studying the stress distribution of the surrounding rock and rock movement, and put forward the control technology of inverted arches and grouting. Bai et al [9] discovered floor heave characteristics in two points and three zones, revealed the influence laws of floor lithology and horizontal stress on floor heave characteristics, and proposed the full-length anchored hydraulic expansion bolt to control floor heave.…”

Section: Introductionmentioning

confidence: 99%

Study on Floor Heave Characteristics and the Control Method of Gob-Side Entry Driving in Weakly Cemented Soft Rock

Yang

Ma³

et al. 2023

Sustainability

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Aiming at the problems of large deformation, long duration, and difficult control of floor heave in gob-side entry driving in weakly cemented soft rock, this paper takes the weakly cemented soft rock mining area in Western China as the engineering background, and studies the characteristics and mechanism of floor heave in gob-side entry driving in weakly cemented soft rock by means of a field investigation, physical component analysis, mechanical property tests of the surrounding rock, and the stress monitoring of the surrounding rock. The classification control method of floor heave is put forward, and field tests are conducted. The results show that: (1) The floor heave characteristics of the dynamic change in the floor heave peak position of gob-side entry driving from the coal pillar side to the mining side are obtained through field observation. (2) Based on the analysis of field data and laboratory test data, it is concluded that the stability time of the overlying strata in gob-side entry driving is about 8 to 12 months. The main internal cause of roadway floor heave is the low load resistance of weakly cemented soft rock. High stress and strong disturbances are the main power sources of strong floor heave. The mechanism of floor heave affected by dynamic lateral abutment pressure is summarized, and the classification control method of floor heave is proposed. (3) The gob-side entry driving support technologies of “adjusting excavation deployment” and “surrounding rock pressure relief and improving support” are proposed. Through field tests, the floor heave can be effectively controlled.

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Stability Control of Overburden and Coal Pillar in the Gob-Side Entry Under Dynamic Pressure

Cited by 3 publications

References 0 publications

Technique and practice of surrounding rock control for the roadway driven under the goafs of small collieries and heading for adjacent advancing face

Technique and practice of surrounding rock control for the roadway driven under the goafs of small collieries and heading for adjacent advancing face

Research on Roof Cutting and Pressure Relief Technology of Deep Hole Pre-cracking Blasting

Study on Floor Heave Characteristics and the Control Method of Gob-Side Entry Driving in Weakly Cemented Soft Rock

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