Study on comprehensive technology of preventing mud cake of large diameter slurry shield in composite stratum
- Release time:2024-08-09
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Affiliation of Author(s):
土木工程学院
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Journal:
Buildings
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Key Words:
slurry shield; mud cake; cutter head sealing coefficient; numerical simulation; scour
system; hydrogen peroxide solution
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Abstract:
When large-diameter slurry shields are tunneling in a composite stratum with a high clay
content, the cutter head may form a mud cake. After the mud cake is formed, it will cover the
cutter and reduce the opening rate of the cutter head, thus reducing the penetration of the cutter
and the driving speed. Based on a road upgrading project, this paper studies the prevention and
treatment of a mud cake and forms a set of comprehensive treatment methods. For a large mud
cake, through theoretical analysis, two calculation methods of the cutter head sealing coefficient are
obtained, and the cutter head sealing coefficient relationship model is established. Comparing the
calculated cutter head’s actual opening coefficient with the required cutter head opening coefficient
can provide a judgment basis for the time of manual warehousing. For medium and small mud
cakes, the numerical simulation is carried out based on the cutter head and the scouring system,
the distribution characteristics of the flow field near the cutter head are analyzed, and the angle of
the central scouring hole is optimized. For a small mud cake, hydrogen peroxide is selected as an
additive through microscopic mechanism analysis. The effect of the hydrogen peroxide solution
concentration on dissolving a mud cake is obtained through laboratory tests, and its effectiveness is
verified through field tests. The research results can provide a reference for the mud cake prevention
of slurry shields in similar strata.
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First Author:
meiyuan
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Indexed by:
Journal paper
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ISSN No.:
2075-5309
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Translation or Not:
no
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Date of Publication:
2022-09-22
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