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- Title
大面积土体加卸载对基坑与邻近隧道变形的影响研究.
- Authors
马玉刚; 陈华斌; 俞建君
- Abstract
There are two subway tunnels under the east square of Zhengzhou Station. Deep foundation pit construction is carried out on the north and south sides and there may be a large area of soil accumulation. The numerical calculation model of large area soil loading and unloading on foundation pit and adjacent tunnel is established. Based on the accuracy verification of the model, the deformation law of foundation pit and tunnel is analyzed, and the influence of whether there is pile soil on the deformation of foundation pit and tunnel and the influence of the excavation sequence of north-south excavation on tunnel deformation are studied. The results show that: (1) the maximum horizontal displacement, settlement and uplift of foundation pit are 9. 1 mm, 106. 6mm and 27. 1 mm, respectively; the maximum horizontal and vertical displacements of the tunnel are 7. 2 mm and 5. 5 mm, and there is no hidden danger of safety and stability. (2) the displacement of foundation pit retaining structure, surface settlement and tunnel structure is about 8%~20%, 20% and 10%~16% smaller than that of the condition without pile soil. (3) from the perspective of soil deformation control and uniform stress of retaining structure, the excavation of south foundation pit is more beneficial to the stability of foundation pit and tunnel than that of north foundation pit.
- Subjects
ZHENGZHOU Shi (China); BUILDING foundations; BORED piles; SUBWAY tunnels; SOIL mechanics; STRUCTURED financial settlements; BEARING capacity of soils
- Publication
Fly Ash Comprehensive Utilization, 2023, Vol 37, Issue 2, p44
- ISSN
1005-8249
- Publication type
Article
- DOI
10.19860/j.cnki.issn1005-8249.2023.02.007