Water-Rich Soft Soil Freezing Method Combined With Steel Sleeve Receiving-Shield Technology Field Test Research
- Release time:2024-08-09
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Affiliation of Author(s):
土木工程学院
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Journal:
FRONTIERS IN EARTH SCIENCE
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Key Words:
water-rich soft soil, horizontal freeze, steel sleeve, freezing temperature field, ground subsidence
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Abstract:
The initiation and reception of shields are major risk events for shield construction in water-rich
and weak strata. Although the freezing method and the steel sleeve method receiving-shield
tunneling technologies both have engineering applications, the environmental safety control
effect cannot meet the construction requirements of water-rich soft soil. Considering the shield
construction of a typical soft soil layer in Suzhou, China, as a research target, the applicability
and safety of the freezing method combined with steel sleeve receiving-shield technology in
water-rich soft soil were evaluated based on a field test system. The test results show that,
during soil freezing, the temperature change trend of each measuring point in the temperature
measuring hole is roughly the same. The freezing process can be divided into five typical
stages. The closer the active freezing period of the water-rich soft soil is to the inside of the
frozen-soil curtain, the faster the development rate of the frozen wall. The soil cooling gradient
increased with an increase in the radial depth. After freezing the curtain circle, the soil frost
heave significantly accelerated until the frost heave amount peaked. During the construction
process, special attention should be paid to the change in the value of the soil settlement
during each stage change to prevent sudden changes in soil displacement. The freezing
method, combined with steel sleeve receiving-shield technology, can effectively reduce the
environmental disturbance caused by shield construction in water-rich soft soil.
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First Author:
meiyuan
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Indexed by:
Journal paper
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ISSN No.:
2296-6463
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Translation or Not:
no
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Date of Publication:
2022-03-17
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