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MODERN TUNNELLING TECHNOLOGY 2019, Vol. 56 Issue (6) :114-120    DOI:
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Study on the Influence of the Construction of Large-section Metro Station on Lateral Friction Resistance of Adjacent Pile Foundation
(1 China Academy of Railway Sciences, Beijing 100081; 2 China Railway Fifth Survey and Design Institute Group Co., Ltd., Beijing 102600; 3 School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010)
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Abstract The construction of metro station underneath or parallel to pile foundation of the bridge causes large area excavation unloading at the side of bridge pile foundation. The operation safety of existing bridges will be threatened due to lateral friction resistance decrease caused by metro construction adjacent to friction pile. A calculation formula of lateral friction resistance friction pile foundation adjacent to metro station is deduced by simplifying the force on existing friction pile foundation as four parts and it is verified in the construction of North Taipingqiao Station of Beijing metro line 19. The results show the maximum lateral friction resistance loss ratio is 42.8% when the excavation depth of metro station is larger than the length of pile foundation; the excavation width of metro station has a little influence on lateral friction resistance loss; injection reinforcement of the soil mass around the pile foundation before construction can enlarge the internal friction angle with the proper range of 25°-30°.
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KeywordsLarge-section metro station   Approaching construction   Bridge pile foundation   Friction pile   Lateral friction resistance   Theoretic analysis     
Abstract: The construction of metro station underneath or parallel to pile foundation of the bridge causes large area excavation unloading at the side of bridge pile foundation. The operation safety of existing bridges will be threatened due to lateral friction resistance decrease caused by metro construction adjacent to friction pile. A calculation formula of lateral friction resistance friction pile foundation adjacent to metro station is deduced by simplifying the force on existing friction pile foundation as four parts and it is verified in the construction of North Taipingqiao Station of Beijing metro line 19. The results show the maximum lateral friction resistance loss ratio is 42.8% when the excavation depth of metro station is larger than the length of pile foundation; the excavation width of metro station has a little influence on lateral friction resistance loss; injection reinforcement of the soil mass around the pile foundation before construction can enlarge the internal friction angle with the proper range of 25°-30°.
KeywordsLarge-section metro station,   Approaching construction,   Bridge pile foundation,   Friction pile,   Lateral friction resistance,   Theoretic analysis     
Cite this article:   
.Study on the Influence of the Construction of Large-section Metro Station on Lateral Friction Resistance of Adjacent Pile Foundation[J]  MODERN TUNNELLING TECHNOLOGY, 2019,V56(6): 114-120
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