Study of the Corrosion Characteristics of Tunnel Fissures in a Karst Area in Southwest China
The development of the fissures in soluble rock of karst areas directly affects the construction and operation safety of tunnel engineering. It is thus of theoretical and practical significance to study the characteristics of its corrosion and its influencing factors. Taking the Wulong tunnel as the...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2018-01-01
|
| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2018/6234932 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832558550359998464 |
|---|---|
| author | Yanjie Zhao Fugang Wang Cangsong Li Yuqing Cao Hailong Tian |
| author_facet | Yanjie Zhao Fugang Wang Cangsong Li Yuqing Cao Hailong Tian |
| author_sort | Yanjie Zhao |
| collection | DOAJ |
| description | The development of the fissures in soluble rock of karst areas directly affects the construction and operation safety of tunnel engineering. It is thus of theoretical and practical significance to study the characteristics of its corrosion and its influencing factors. Taking the Wulong tunnel as the research object, the numerical model of the study area was established to quantitatively analyze the corrosion range, corrosion ratio, and changes in the permeability and porosity of the fissures in soluble rock of karst areas of the tunnel over the past 100 years, and the simulation results were verified by field experiments. The results show that the main controlling factor of the fissure corrosion of the tunnel in the karst area is the flow rate. The corrosion range and corrosion ratio of the fissures of the tunnels in the karst area increased with temperature because the reaction rate constant increased with temperature, causing the reactions’ equilibrium to move towards the direction of the solution. The larger the initial permeability and the larger the porosity of the fissures, the faster the fissures corrode. In the same time period, the fissures with high permeability and large porosity will lead to the permeability and porosity being more enhanced, thus causing the corrosion of the fissures to exhibit secondary enhancement effects. The opening of the dead-end pores greatly enhanced the permeability and slightly increased the porosity, which caused the differential corrosion of fissures in the karst area. The protection of the tunnel should be strengthened, mainly in strong hydrodynamic conditions and in the fracture development zone. |
| format | Article |
| id | doaj-art-b447646ff3c4467c8376f145a18024c1 |
| institution | Kabale University |
| issn | 1468-8115 1468-8123 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-b447646ff3c4467c8376f145a18024c12025-02-03T01:32:05ZengWileyGeofluids1468-81151468-81232018-01-01201810.1155/2018/62349326234932Study of the Corrosion Characteristics of Tunnel Fissures in a Karst Area in Southwest ChinaYanjie Zhao0Fugang Wang1Cangsong Li2Yuqing Cao3Hailong Tian4Key Laboratory of Groundwater Resources and Environment Ministry of Education, Jilin University, Changchun 130021, ChinaKey Laboratory of Groundwater Resources and Environment Ministry of Education, Jilin University, Changchun 130021, ChinaChina Railway Southwest Research Institute Co. Ltd., Chengdu, Sichuan 611731, ChinaKey Laboratory of Groundwater Resources and Environment Ministry of Education, Jilin University, Changchun 130021, ChinaKey Laboratory of Groundwater Resources and Environment Ministry of Education, Jilin University, Changchun 130021, ChinaThe development of the fissures in soluble rock of karst areas directly affects the construction and operation safety of tunnel engineering. It is thus of theoretical and practical significance to study the characteristics of its corrosion and its influencing factors. Taking the Wulong tunnel as the research object, the numerical model of the study area was established to quantitatively analyze the corrosion range, corrosion ratio, and changes in the permeability and porosity of the fissures in soluble rock of karst areas of the tunnel over the past 100 years, and the simulation results were verified by field experiments. The results show that the main controlling factor of the fissure corrosion of the tunnel in the karst area is the flow rate. The corrosion range and corrosion ratio of the fissures of the tunnels in the karst area increased with temperature because the reaction rate constant increased with temperature, causing the reactions’ equilibrium to move towards the direction of the solution. The larger the initial permeability and the larger the porosity of the fissures, the faster the fissures corrode. In the same time period, the fissures with high permeability and large porosity will lead to the permeability and porosity being more enhanced, thus causing the corrosion of the fissures to exhibit secondary enhancement effects. The opening of the dead-end pores greatly enhanced the permeability and slightly increased the porosity, which caused the differential corrosion of fissures in the karst area. The protection of the tunnel should be strengthened, mainly in strong hydrodynamic conditions and in the fracture development zone.http://dx.doi.org/10.1155/2018/6234932 |
| spellingShingle | Yanjie Zhao Fugang Wang Cangsong Li Yuqing Cao Hailong Tian Study of the Corrosion Characteristics of Tunnel Fissures in a Karst Area in Southwest China Geofluids |
| title | Study of the Corrosion Characteristics of Tunnel Fissures in a Karst Area in Southwest China |
| title_full | Study of the Corrosion Characteristics of Tunnel Fissures in a Karst Area in Southwest China |
| title_fullStr | Study of the Corrosion Characteristics of Tunnel Fissures in a Karst Area in Southwest China |
| title_full_unstemmed | Study of the Corrosion Characteristics of Tunnel Fissures in a Karst Area in Southwest China |
| title_short | Study of the Corrosion Characteristics of Tunnel Fissures in a Karst Area in Southwest China |
| title_sort | study of the corrosion characteristics of tunnel fissures in a karst area in southwest china |
| url | http://dx.doi.org/10.1155/2018/6234932 |
| work_keys_str_mv | AT yanjiezhao studyofthecorrosioncharacteristicsoftunnelfissuresinakarstareainsouthwestchina AT fugangwang studyofthecorrosioncharacteristicsoftunnelfissuresinakarstareainsouthwestchina AT cangsongli studyofthecorrosioncharacteristicsoftunnelfissuresinakarstareainsouthwestchina AT yuqingcao studyofthecorrosioncharacteristicsoftunnelfissuresinakarstareainsouthwestchina AT hailongtian studyofthecorrosioncharacteristicsoftunnelfissuresinakarstareainsouthwestchina |