Experimental study of the comprehensive technology of grouting and suspension under an operating railway in the cobble 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:
Transportation Geotechnics
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Key Words:
Metro engineering
Shield construction
Underpass railway
Track suspension method
Field test
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Abstract:
The construction technology of shield tunnelling under an operating railway in an adverse stratum is complex
and risky. The existing research results mostly focus on the settlement control of the tunnel under the existing
structure, but they are not adequate to provide a systematic reference for shield tunnelling under an operating
railway with strict requirements on the settlement control. Based on the background of the Luoyang Rail Transit
Line 2 shield passing through the Luoyi Railway, the comprehensive technology of grouting and suspension
(CTGS) has been proposed, and field test and numerical simulation are used to study the effects of its application.
The results show that the comprehensive technology of grouting and suspension has a significant effect on the
rail settlement control of shield tunnelling under the operating railway in a cobble stratum. Using the grouting
method to grout subgrade soil can improve the strength of the overlying soil layer. Using the suspension method
to suspend the railway tracks can directly transfer the load to the pile foundation to avoid the subgrade bearing
excessive load. CTGS combines the grouting method with the suspension method, which can be used as the
preferred technology to control the influence of subgrade soil settlement on railway track surface. Compared
with the similar technology, although the project cost is slightly higher, CTGS significantly ensures railway safety
during the construction process, which can help keep the railway operation free from interference during the
construction period and has obvious comprehensive benefits. CTGS has an important reference value for the
safety control of shield tunnelling construction with the risky source under adverse geological conditions such as
a sandy cobble stratum.
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First Author:
meiyuan
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Indexed by:
Journal paper
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ISSN No.:
2214-3912
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Translation or Not:
no
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Date of Publication:
2021-07-01
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