Mechanical response characteristics of lining structure of pipeline karst tunnels in water-rich areas

Authors

Hao-bo FAN, State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China
Ding-kun ZHOU, Key Laboratory of Roads and Railway Engineering Safety Control of Ministry of Education, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China
Yong LIU, Key Laboratory of Roads and Railway Engineering Safety Control of Ministry of Education, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, ChinaFollow
Yu-xiang SONG, Key Laboratory of Roads and Railway Engineering Safety Control of Ministry of Education, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China
Zheng-guo ZHU, Hebei Province Technical Innovation Center of Safe and Effective Mining of Metal Mines, Shijiazhuang Tiedao University, Shijiazhuang, Hebei, 050043, China
Yong-quan ZHU, State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China
Xin-qiang GAO, State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China
Jia-qi GUO, School of Civil Engineering, Henan Polytechnic University, Jiaozuo, Henan 454003, China

Abstract

For the karst tunnel with pipeline cavities in the surrounding rock, it is very easy to accumulate high water pressure in the pipeline cavity due to the influences of heavy rainfall on the surface and groundwater, which will lead to lining cracking, water leakage, and water gushing diseases. To explore the influence of high water pressure on the lining structure, model tests of pipeline karst tunnels under high water pressure were carried out, and the internal force characteristics of tunnel lining under the influence of cavity position and water head height were studied. Based on the test findings, the numerical calculation models of extended working conditions were established. The effects of cavity diameter, cavity position, and water head height on the lining structure were further explored. The results show that the inner side of the lining in contact with the cavities bears a larger positive bending moment when there are karst cavities around the tunnel, and is the most unfavorable position of the lining to bear loads. The internal forces of the lining increase greatly, with the increase of cavity diameter and water head height in the cavity. The location of the cavity affects the internal force distributions of the lining, and the water pressure resistance capacity of the lining is the smallest when the cavity is located at the tunnel vault. The research results can provide a reference for the structural design and safe construction of pipeline karst tunnels.

Graphic Abstract

Recommended Citation

FAN, Hao-bo; ZHOU, Ding-kun; LIU, Yong; SONG, Yu-xiang; ZHU, Zheng-guo; ZHU, Yong-quan; GAO, Xin-qiang; and GUO, Jia-qi (2022) "Mechanical response characteristics of lining structure of pipeline karst tunnels in water-rich areas," Rock and Soil Mechanics: Vol. 43: Iss. 7, Article 5.
DOI: 10.16285/j.rsm.2021.6730
Available at: https://rocksoilmech.researchcommons.org/journal/vol43/iss7/5