Field Test Study of the Artificial Ground-Freezing Method Subsurface Excavation Construction of Watered Sandy Stratum in Collapsible Loess Area
- Release time:2024-08-09
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Affiliation of Author(s):
土木工程学院
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Journal:
Advances in Civil Engineering
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Abstract:
Saturated sandy stratum often makes tunnel excavation exceedingly difficult owing to its high water content. /e artificial groundfreezing (AGF) method is an effective way to reduce the construction risks in such stratum; however, the AGF mechanism in the
saturated sandy stratum of a collapsible loess area still lacks sufficient research. Based on field tests and numerical simulations, this
study investigates the regularity of the temperature development, frost heave, and thaw subsidence distribution during the cross
passage construction of a saturated sandy stratum in a collapsible loess area, using the AGF method. /e results showed that the
inward development rate of the frozen soil wall in the saturated sandy stratum was faster than its outward development rate. /e
gradient of the soil cooling curve was positively related to the longitudinal depth of the cross passage. /e thickness of the frozen
soil wall calculated by the slowest development rate of the frozen soil was conservative. /e application of the pressure relief hole
was beneficial to the release of the frost-heaving force and the control of the frost-heaving displacement. /e pressure gauge
pressure increase could be used as an identifier for the closure of a frozen soil wall. After excavation, the inner wall of the cross
passage moved toward the inner space of the passage.
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First Author:
meiyuan
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Indexed by:
Journal paper
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ISSN No.:
1687-8086
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Translation or Not:
no
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Date of Publication:
2020-12-29
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