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- Title
Research on the Combined Artificial Ground Freezing Support Technology for Foundation Pit Excavation without Precipitation.
- Authors
ZHANG Song; YUE Zurun; LU Xiangzhong; ZHANG Qingwu; SUN Tiecheng; HU Tianfei; QI Yuanshui; ZHANG Junyang
- Abstract
Recently, with the continuous increase in the protection of groundwater resources, the need for excavation without dewatering for foundation pit engineering has become increasingly urgent. In order to solve the problem of dewatering in the construction of foundation pits in water-rich strata, this paper proposes a new foundation pit support method-the combined artificial ground freezing method. The combined artificial ground freezing combines traditional suspended impervious curtain and horizontal frozen curtains and can realize no-dewatering excavation of foundation pit engineering. According to the construction experiences of the freezing method in past municipal engineering, the construction process of the combined artificial ground freezing is summarized. The frost heave control measures, pressure relief pipes, temperature limit pipes, local freezing technology, and the interface area strengthening measures using freezing pipes embedded in the diaphragm wall are proposed. The model test verifies the feasibility of the combined artificial ground freezing method. The test results show that the method can effectively realize the support of the foundation pit. The bearing capacity of the frozen curtain close to the temporary shaft and the diaphragm, which is the weakest zone of the frozen curtain, can meet the design requirements. The observation found that the freezing had no apparent effect on the strength and deformation of the diaphragm wall.
- Subjects
BUILDING foundations; FREEZING; WELLHEAD protection; DIAPHRAGM walls; FROST heaving; LONGWALL mining
- Publication
Railway Standard Design, 2024, Vol 68, Issue 2, p143
- ISSN
1004-2954
- Publication type
Article
- DOI
10.13238/j.issn.1004-2954.202207110001