Continuous-discrete coupling-based stability study of surrounding rock of limestone roadway in acid environment

Zhong, Zuliang; Hu, Xinyun; Luo, Weikun; Ren, Yuqi

doi:10.1007/s12517-019-4452-7

Cited by 3 publications

(1 citation statement)

References 6 publications

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“…For the broken surrounding rock, the ordinary anchor cable easily breaks off and cannot apply high prestress. It is possible to repair the broken part with grouting technology, improve the mechanical properties of the weak surface, improve the cohesion and internal friction angle of the cracks, and enhance the overall strength of the surrounding rock to form an effective prestressed bearing structure for the anchor cable [33][34][35][36]. Figure 22 shows a technical diagram of the grouting anchor cable.…”

Section: Grouting Anchor Cable + Single Prop + 29u Type Steel Combined Supportmentioning

confidence: 99%

Failure Mechanism and Control Technology of Thick and Soft Coal Fully Mechanized Caving Roadway under Double Gobs in Close Coal Seams

Xie

Chen

et al. 2020

Shock and Vibration

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The surrounding rock of the roadway under double gobs in the lower coal seams is partially damaged by the mining of the upper coal seam and the stress superimposition of the stepped coal pillars. What is worse, the upper layer of the roof is collapse gangue in double gobs, which makes the anchor cable unable to anchor the reliable bearing layer, so the anchoring performance is weakened. The actual drawing forces of the anchor bolt and anchor cable are only approximately 50 kN and 80 kN, respectively. The roadway develops cracks and large deformations with increasing difficulty in achieving safe ventilation. In view of the above problems, taking the close coal seam mining in the Zhengwen Coal Mine as the engineering background, a theoretical calculation is used to obtain the loading of the step coal pillars and the slip line field distribution of the floor depth. The numerical simulation monitors the stress superimposition of stepped coal pillars and the distribution of elastoplastic areas to effectively evaluate the layout of mining roadways. The numerical simulation also analyzes the effective prestress field distribution of the broken roof and grouting roof anchor cable. A laboratory test was used to monitor the strength of the grouting test block of the broken coal body. Then, we proposed that grouting anchor cable be used to strengthen the weak surface of the roof and block the roof cracks. From on-site measurement, the roadway was seen to be arranged in the lateral stress stabilization area of the stepped coal pillars, the combined support technology of the grouting anchor cable (bolt) + U type steel + a single prop was adopted, the roadway deformation was small, the gas influx was reduced, and the drawing force of the anchor bolt and the anchor cable was increased to approximately 160 kN and 350 kN, respectively. The overall design and control technology of the roadway can meet the site safety and efficient production requirements.

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Section: Grouting Anchor Cable + Single Prop + 29u Type Steel Combined Supportmentioning

confidence: 99%

Failure Mechanism and Control Technology of Thick and Soft Coal Fully Mechanized Caving Roadway under Double Gobs in Close Coal Seams

Xie

Chen

et al. 2020

Shock and Vibration

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The damage mechanism and deterioration characteristics of acid-corroded sandstone: an experimental study

Huo

Liang

et al. 2022

Arab J Geosci

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Mechanical Property Degradation and Prediction Model of Red Sandstone Under Action of Dry–Wet Cycles in Acid Environment

Liu,

Wang,

Zhao

et al. 2023

Indian Geotech J

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Continuous-discrete coupling-based stability study of surrounding rock of limestone roadway in acid environment

Cited by 3 publications

References 6 publications

Failure Mechanism and Control Technology of Thick and Soft Coal Fully Mechanized Caving Roadway under Double Gobs in Close Coal Seams

Failure Mechanism and Control Technology of Thick and Soft Coal Fully Mechanized Caving Roadway under Double Gobs in Close Coal Seams

The damage mechanism and deterioration characteristics of acid-corroded sandstone: an experimental study

Mechanical Property Degradation and Prediction Model of Red Sandstone Under Action of Dry–Wet Cycles in Acid Environment

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