Numerical Analysis of the Width Design of a Protective Pillar in High-Stress Roadway: A Case Study
The width design of protective pillars is an important factor affecting the stability of high-stress roadways. In this study, a novel numerical modeling approach was developed to investigate the relationship between protective pillar width and roadway stability. With the 20 m protective pillar width...
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2021/5533364 |
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| author | FuZhou Qi ZhanGuo Ma Ning Li Bin Li Zhiliu Wang WeiXia Ma |
| author_facet | FuZhou Qi ZhanGuo Ma Ning Li Bin Li Zhiliu Wang WeiXia Ma |
| author_sort | FuZhou Qi |
| collection | DOAJ |
| description | The width design of protective pillars is an important factor affecting the stability of high-stress roadways. In this study, a novel numerical modeling approach was developed to investigate the relationship between protective pillar width and roadway stability. With the 20 m protective pillar width adopted in the field test, large deformation of roadways and serious damage to surrounding rocks occurred. According to the case study at the Wangzhuang coal mine in China, the stress changes and energy density distribution characteristics in protective pillars with various widths were analysed by numerical simulation. The modeling results indicate that, with a 20 m wide protective pillar, the peak vertical stress and energy density in the pillar are 18.5 MPa and 563.7 kJ/m3, respectively. The phenomena of stress concentration and energy accumulation were clearly observed in the simulation results, and the roadway is in a state of high stress. Under the condition of a 10 m wide protective pillar, the peak vertical stress and energy density are shifted from the pillar to roadway virgin coal region, with peak values of 9.5 MPa and 208.3 kJ/m3, respectively. The decrease in vertical stress and energy density improves the stability of the protective pillar, resulting in the roadway being in a state of low stress. Field monitoring suggested that the proposed 10 m protective pillar width can effectively control the large deformation of the surrounding rock and reduce coal bump risk. The novel numerical modeling approach and design principle of protective pillars presented in this paper can provide useful references for application in similar coal mines. |
| format | Article |
| id | doaj-art-ee687619e65a43b0a33cddfa07f5292d |
| institution | Kabale University |
| issn | 1687-8086 1687-8094 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj-art-ee687619e65a43b0a33cddfa07f5292d2025-02-03T05:49:50ZengWileyAdvances in Civil Engineering1687-80861687-80942021-01-01202110.1155/2021/55333645533364Numerical Analysis of the Width Design of a Protective Pillar in High-Stress Roadway: A Case StudyFuZhou Qi0ZhanGuo Ma1Ning Li2Bin Li3Zhiliu Wang4WeiXia Ma5School of Civil & Architecture Engineering, Zhongyuan University of Technology, Zhengzhou 450007, Henan, ChinaState Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, ChinaState Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, ChinaSchool of Civil & Architecture Engineering, Zhongyuan University of Technology, Zhengzhou 450007, Henan, ChinaSchool of Civil & Architecture Engineering, Zhongyuan University of Technology, Zhengzhou 450007, Henan, ChinaEarthquake Administration of Henan, Zhengzhou 450016, Henan, ChinaThe width design of protective pillars is an important factor affecting the stability of high-stress roadways. In this study, a novel numerical modeling approach was developed to investigate the relationship between protective pillar width and roadway stability. With the 20 m protective pillar width adopted in the field test, large deformation of roadways and serious damage to surrounding rocks occurred. According to the case study at the Wangzhuang coal mine in China, the stress changes and energy density distribution characteristics in protective pillars with various widths were analysed by numerical simulation. The modeling results indicate that, with a 20 m wide protective pillar, the peak vertical stress and energy density in the pillar are 18.5 MPa and 563.7 kJ/m3, respectively. The phenomena of stress concentration and energy accumulation were clearly observed in the simulation results, and the roadway is in a state of high stress. Under the condition of a 10 m wide protective pillar, the peak vertical stress and energy density are shifted from the pillar to roadway virgin coal region, with peak values of 9.5 MPa and 208.3 kJ/m3, respectively. The decrease in vertical stress and energy density improves the stability of the protective pillar, resulting in the roadway being in a state of low stress. Field monitoring suggested that the proposed 10 m protective pillar width can effectively control the large deformation of the surrounding rock and reduce coal bump risk. The novel numerical modeling approach and design principle of protective pillars presented in this paper can provide useful references for application in similar coal mines.http://dx.doi.org/10.1155/2021/5533364 |
| spellingShingle | FuZhou Qi ZhanGuo Ma Ning Li Bin Li Zhiliu Wang WeiXia Ma Numerical Analysis of the Width Design of a Protective Pillar in High-Stress Roadway: A Case Study Advances in Civil Engineering |
| title | Numerical Analysis of the Width Design of a Protective Pillar in High-Stress Roadway: A Case Study |
| title_full | Numerical Analysis of the Width Design of a Protective Pillar in High-Stress Roadway: A Case Study |
| title_fullStr | Numerical Analysis of the Width Design of a Protective Pillar in High-Stress Roadway: A Case Study |
| title_full_unstemmed | Numerical Analysis of the Width Design of a Protective Pillar in High-Stress Roadway: A Case Study |
| title_short | Numerical Analysis of the Width Design of a Protective Pillar in High-Stress Roadway: A Case Study |
| title_sort | numerical analysis of the width design of a protective pillar in high stress roadway a case study |
| url | http://dx.doi.org/10.1155/2021/5533364 |
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