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| DOI：10.13522/j.cnki.ggps.2023597 |
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| Research on the support type of deep foundation pit at the entrance of large water conservancy tunnel |
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HONG Zhenguo, PAN Zhonghua, CHEN Lisong
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Yunnan Water and Hydropower Engineering Investigation, Design and Research Institute, Kunming 650021, China
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| Abstract: |
| Research on the types of deep foundation pit support for large water conservancy engineering tunnels, in order to provide new methods for deep foundation pit support and further expand the application scope of deep foundation pit support. By comparing the technical feasibility, sustainable development, and economic rationality of several types of support for deep foundation pits, such as cement soil piles, underground continuous walls, and interlocking piles, and combining with the stability calculation of deep foundation pit support, the safety of the support types is reviewed. The interlocking pile has good waterproof performance, high overall stiffness, and small deformation in deep foundation pits, ensuring the safety of excavation of the entrance slope of large water conservancy tunnels with poor geological conditions, and creating safe conditions for the smooth excavation and operation of tunnels; Adopting bite pile support at the entrance of the large cross-section tunnel takes up less space, effectively solving the difficulties of land acquisition and demolition. Dry hole operation makes it easy to form holes, and the construction speed is faster, creating conditions for timely completion of construction; The construction cost of bite pile is low, there is no need to discharge mud, and the mechanical equipment has less vibration and low noise. Compared with deep foundation pit support types, interlocking piles have higher economic, safety, and environmental friendliness, effectively enhancing the application range of interlocking piles and providing new methods for design. |
| Key words: large scale hydraulic engineering; deep foundation pit support; stability; economy; security; environmental friendliness; new method |
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