Failure Mode of the Water-filled Fractures under Hydraulic Pressure in Karst Tunnels
Water-filled fractures continue to grow after the excavation of karst tunnels, and the hydraulic pressure in these fractures changes along with such growth. This paper simplifies the fractures in the surrounding rock as flat ellipses and then identifies the critical hydraulic pressure values require...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
De Gruyter
2017-06-01
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| Series: | Open Geosciences |
| Subjects: | |
| Online Access: | https://doi.org/10.1515/geo-2017-0016 |
| _version_ | 1819147010098331648 |
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| author | Dong Xin Lu Hao Huang Houxu Hao Yiqing Xia Yuanpu |
| author_facet | Dong Xin Lu Hao Huang Houxu Hao Yiqing Xia Yuanpu |
| author_sort | Dong Xin |
| collection | DOAJ |
| description | Water-filled fractures continue to grow after the excavation of karst tunnels, and the hydraulic pressure in these fractures changes along with such growth. This paper simplifies the fractures in the surrounding rock as flat ellipses and then identifies the critical hydraulic pressure values required for the occurrence of tensile-shear and compression-shear failures in water-filled fractures in the case of plane stress. The occurrence of tensile-shear fracture requires a larger critical hydraulic pressure than compression-shear failure in the same fracture. This paper examines the effects of fracture strike and lateral pressure coefficient on critical hydraulic pressure, and identifies compression-shear failure as the main failure mode of water-filled fractures. This paper also analyses the hydraulic pressure distribution in fractures with different extensions, and reveals that hydraulic pressure decreases along with the continuous growth of fractures and cannot completely fill a newly formed fracture with water. Fracture growth may be interrupted under the effect of hydraulic tensile shear. |
| first_indexed | 2024-12-22T13:23:01Z |
| format | Article |
| id | doaj.art-12b02b4031bd4b4e8096d3e54ddfdc3a |
| institution | Directory Open Access Journal |
| issn | 2391-5447 |
| language | English |
| last_indexed | 2024-12-22T13:23:01Z |
| publishDate | 2017-06-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Open Geosciences |
| spelling | doaj.art-12b02b4031bd4b4e8096d3e54ddfdc3a2022-12-21T18:24:24ZengDe GruyterOpen Geosciences2391-54472017-06-019118619610.1515/geo-2017-0016geo-2017-0016Failure Mode of the Water-filled Fractures under Hydraulic Pressure in Karst TunnelsDong Xin0Lu Hao1Huang Houxu2Hao Yiqing3Xia Yuanpu4State Key Laboratory for Diasaster Prevention & Mitigation of Explosion & Impact, PLA University of Science and Technology, Nanjing, 210007, Jiangsu province, ChinaState Key Laboratory for Diasaster Prevention & Mitigation of Explosion & Impact, PLA University of Science and Technology, Nanjing, 210007, Jiangsu province, ChinaState Key Laboratory for Diasaster Prevention & Mitigation of Explosion & Impact, PLA University of Science and Technology, Nanjing, 210007, Jiangsu province, ChinaState Key Laboratory for Diasaster Prevention & Mitigation of Explosion & Impact, PLA University of Science and Technology, Nanjing, 210007, Jiangsu province, ChinaState Key Laboratory for Diasaster Prevention & Mitigation of Explosion & Impact, PLA University of Science and Technology, Nanjing, 210007, Jiangsu province, ChinaWater-filled fractures continue to grow after the excavation of karst tunnels, and the hydraulic pressure in these fractures changes along with such growth. This paper simplifies the fractures in the surrounding rock as flat ellipses and then identifies the critical hydraulic pressure values required for the occurrence of tensile-shear and compression-shear failures in water-filled fractures in the case of plane stress. The occurrence of tensile-shear fracture requires a larger critical hydraulic pressure than compression-shear failure in the same fracture. This paper examines the effects of fracture strike and lateral pressure coefficient on critical hydraulic pressure, and identifies compression-shear failure as the main failure mode of water-filled fractures. This paper also analyses the hydraulic pressure distribution in fractures with different extensions, and reveals that hydraulic pressure decreases along with the continuous growth of fractures and cannot completely fill a newly formed fracture with water. Fracture growth may be interrupted under the effect of hydraulic tensile shear.https://doi.org/10.1515/geo-2017-0016karst tunnelwater-filled fracturesfailure mode |
| spellingShingle | Dong Xin Lu Hao Huang Houxu Hao Yiqing Xia Yuanpu Failure Mode of the Water-filled Fractures under Hydraulic Pressure in Karst Tunnels Open Geosciences karst tunnel water-filled fractures failure mode |
| title | Failure Mode of the Water-filled Fractures under Hydraulic Pressure in Karst Tunnels |
| title_full | Failure Mode of the Water-filled Fractures under Hydraulic Pressure in Karst Tunnels |
| title_fullStr | Failure Mode of the Water-filled Fractures under Hydraulic Pressure in Karst Tunnels |
| title_full_unstemmed | Failure Mode of the Water-filled Fractures under Hydraulic Pressure in Karst Tunnels |
| title_short | Failure Mode of the Water-filled Fractures under Hydraulic Pressure in Karst Tunnels |
| title_sort | failure mode of the water filled fractures under hydraulic pressure in karst tunnels |
| topic | karst tunnel water-filled fractures failure mode |
| url | https://doi.org/10.1515/geo-2017-0016 |
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