Overlying Strata Movement of Below Protective Seam

Bai, Yuesong; Hu, Yue

doi:10.2112/si83-030.1

Cited by 3 publications

(2 citation statements)

References 13 publications

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“…It can be seen from Figure 12 that the continuous advance of the working face led to a gradual increase in 8 Geofluids 10 Geofluids the degree of stress concentration on either side of the roadway. The roadway was located in the mining abutment pressure-rising area, which also corresponded to similar simulation results; the degree of stress concentration on the right side of the roadway near the working face was greater than that of the left side.…”

Section: Analysis Of Stress Change In Roadway Duringmentioning

confidence: 99%

“…In view of the deformation and failure characteristics of the overlying strata caused by the mining of the lower protective layer, a significant amount of research has been carried out. Jiao et al [8], Cao et al [9], and Bai and Hu [10] studied the movement and deformation characteristics of the overlying strata during the mining process of the lower protective seam. Shun et al [11] and Xiong et al [12] analyzed the migration rule of overburden after mining.…”

Section: Introductionmentioning

confidence: 99%

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Study on Deformation and Failure Characteristics of Surrounding Rock of Overlying Roadway under Upward Mining in the Deep Mine

Xiong

Chang

et al. 2021

Geofluids

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To study the impact of mining of the lower protective layer on the deformation and failure characteristics of the upper roadway, these characteristics of an 879 gas drainage roadway were studied and analyzed during the mining of the II 1051 working face of the Zhuxianzhuang coal mine using similar simulation experiments and numerical simulation methods. The results indicate that with the continuous excavation of the working face, the range of impact of the mining stress gradually spreads and exceeds the level of the roadway. At the present time, the roadway is in a mining stress-rising area. The two sides of the roadway are sheared, and the roof and floor are under tension–shear composite failure. The floor is the most gravely damaged—the depth of its damage is 2.5 m, and the depths of damage on either side and of the roof are approximately 1–2 m. During the advancing process of the working face, the deformation of the roadway increases slowly at first, then increases sharply, and tends to be stable thereafter. The deformation of the floor is the largest, followed by those of the two sides and the roof; the values are 800, 400, and 300 mm, respectively.

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Section: Analysis Of Stress Change In Roadway Duringmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on Deformation and Failure Characteristics of Surrounding Rock of Overlying Roadway under Upward Mining in the Deep Mine

Xiong

Chang

et al. 2021

Geofluids

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Overlying Strata Structure Evolution and Engineering Practice Based on the Mining of Lower Liberating Seam in Deep Bursting Coal Seam Group

Gao

Song

et al. 2021

Geotech Geol Eng

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Research on the Key Technology of Gob-Side Entry Retaining by Roof Cutting for Thick and Hard Sandstone Roofs

Wang

et al. 2022

Sustainability

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In order to ensure the application of gob-side entry retaining by roof cutting for thick and hard sandstone roofs, the key technology of pre-split blasting was studied. The LS-DYNA was used to analyze the blasting effect of the energy-gathering pipe. Using the methods of theoretical analysis and numerical simulation, it was determined that the optimal cutting height was 16 m and the optimal cutting angle was 15°. The effect of pressure relief by roof cutting was verified by FLAC3D. It is proposed to use deep-hole loosening blasting to solve the problem of the sandstone with a thick hard roof being difficult to collapse. A group of loose blasting holes was designed to be arranged every 20 m in the gob-side roadway. The depth of the #1 blasthole was 47 m, and the angle to the horizontal direction was 20°; the depth of the #2 blasthole was 65 m, and the angle to the horizontal direction was 15°. A field test was carried out in the 7135 ventilation roadway of Qidong Coal Mine China. The on-site peeping results showed that the blasting with the energy-gathering pipe had a good effect of directional slitting. After deep-hole loosening blasting, the thick hard sandstone roof collapsed and filled the gob in time. The monitoring curves of the hydraulic support showed that the hydraulic support resistance of the working face in the side with roof cutting was much smaller than that of the side without roof cutting, and the effect of pressure relief by roof cutting was good.

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Overlying Strata Movement of Below Protective Seam

Cited by 3 publications

References 13 publications

Study on Deformation and Failure Characteristics of Surrounding Rock of Overlying Roadway under Upward Mining in the Deep Mine

Study on Deformation and Failure Characteristics of Surrounding Rock of Overlying Roadway under Upward Mining in the Deep Mine

Overlying Strata Structure Evolution and Engineering Practice Based on the Mining of Lower Liberating Seam in Deep Bursting Coal Seam Group

Research on the Key Technology of Gob-Side Entry Retaining by Roof Cutting for Thick and Hard Sandstone Roofs

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