Analysis on Influence of Sand Replacement on Responses of Utility Tunnels Through Active Ground Fissures

XU Qiang; BAI Chaoyu; LI Wenyang; CHEN Haoran; AN Peng; LI Liangcheng

doi:10.13204/j.gyjzG21022405

Volume 52 Issue 3

Jul. 2022

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XU Qiang, BAI Chaoyu, LI Wenyang, CHEN Haoran, AN Peng, LI Liangcheng. Analysis on Influence of Sand Replacement on Responses of Utility Tunnels Through Active Ground Fissures[J]. INDUSTRIAL CONSTRUCTION, 2022, 52(3): 17-23. doi: 10.13204/j.gyjzG21022405

Citation:

XU Qiang, BAI Chaoyu, LI Wenyang, CHEN Haoran, AN Peng, LI Liangcheng. Analysis on Influence of Sand Replacement on Responses of Utility Tunnels Through Active Ground Fissures[J]. INDUSTRIAL CONSTRUCTION, 2022, 52(3): 17-23. doi: 10.13204/j.gyjzG21022405

Citation:

XU Qiang, BAI Chaoyu, LI Wenyang, CHEN Haoran, AN Peng, LI Liangcheng. Analysis on Influence of Sand Replacement on Responses of Utility Tunnels Through Active Ground Fissures[J]. INDUSTRIAL CONSTRUCTION, 2022, 52(3): 17-23. doi: 10.13204/j.gyjzG21022405

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Analysis on Influence of Sand Replacement on Responses of Utility Tunnels Through Active Ground Fissures

doi: 10.13204/j.gyjzG21022405

1. College of Geological Engineering and Geomatics, Chang’an University, Xi’an 710054, China;
2. Field Scientific Observation and Research Station of Ground Fissures and Land Subsidence, Xi’an 710054, China;
3. China Jikan Research Institute of Engineering Investigations and Design Co., Ltd., Xi’an 710043, China

Received Date: 2021-02-24

Abstract

Abstract

The construction of underground utility tunnels will inevitably be affected by ground fracture activities in urban areas where ground fissures are widely distributed. Based on existing physical model test results of rectangular tunnels, the damage effect and process caused by ground fracture were analyzed, and the numerical model was constructed. The validity of the numerical model was verified by comparing the test results and numerical simulation results. By constructing a three-dimensional finite element model of underground utility tunnels crossing ground fissures, four kinds of settlement cases of 50 mm, 100 mm, 150 mm and 200 mm were setted, and the length, height and angle of sand cushions were taken as variables. Numerical simulations were parformed and the results showed that the maximum longitudinal stress of utility tunnels had a decreasing trend with the gradual increase of the length, thickness and angle of the sand cushions within a certain range. Beyond a certain limit, the trend would abate. The optimal length, thickness and angle of sand cushions were 6 m, 3 m and 60° respectively. The maximum longitudinal stress in underground utility tunnels with sand replacement was significantly reduced by about 20% compared with that of underground utility tunnels which were untreated.
- underground utility tunnel,
- ground fracture,
- sand replacement,
- longitudinal stress,
- prevention

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References(27)

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