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Control structure and construction technology of uneven settlement of roadbed subgrade under high-speed railway tunnel passing through airport

A technology for pavement and high-speed rail, which is applied in the field of uneven settlement control structure and construction technology of roadbed subgrade under high-speed rail tunnels passing through airport pavements, and can solve the problems of great impact on airport and high-speed rail operation safety, uneven settlement, and difficulty, etc. Improve the overall deformation coordination, facilitate the dispersion of stress, and reduce the effect of self-weight

Active Publication Date: 2021-04-27
TONGJI UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the implementation process of the high-speed railway tunnel crossing the airport pavement project, the backfilling of the foundation pit does not meet the requirements, resulting in uneven settlement, and there are frequent cases where reprocessing is required. Reprocessing is difficult and expensive, which is harmful to the safety of the airport and high-speed rail operations. Greater impact

Method used

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  • Control structure and construction technology of uneven settlement of roadbed subgrade under high-speed railway tunnel passing through airport
  • Control structure and construction technology of uneven settlement of roadbed subgrade under high-speed railway tunnel passing through airport

Examples

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Embodiment 1

[0044] Establish a simplified finite element model of the foam lightweight soil foundation under the high-speed railway tunnel passing through the airport pavement, and obtain the foundation of the foam lightweight soil foundation under different thicknesses and moduli by changing the thickness and modulus of the foam lightweight soil Uneven settlement shall be judged in combination with uneven settlement of airport pavement subgrade and settlement requirements (uneven settlement less than 1.5‰, settlement less than 20cm).

[0045] The present invention provides a construction technique for the uneven settlement control structure of a high-speed railway tunnel passing through an airport pavement subgrade, comprising the following steps:

[0046] Step 1: Clean up and level the construction site, remove debris on the top of the tunnel, drain the accumulated water in the foundation pit, and pour plain concrete according to the design requirements after the high-speed rail tunnel is ...

Embodiment 2

[0053] The present invention provides a construction technique for the uneven settlement control structure of a high-speed railway tunnel passing through an airport pavement subgrade, comprising the following steps:

[0054] Step 1: Clean up and level the construction site, remove debris on the top of the tunnel, drain the accumulated water in the foundation pit, and pour plain concrete 1 according to the design requirements after the high-speed rail tunnel is accepted, within the range of 0.5m-1m from the vault top;

[0055] Step 2: After the plain concrete layer has reached the design strength and passed the acceptance check, part of the foundation pit maintenance wall 2 around the plain concrete is removed, and the demolition range is 2m-4m from the bottom elevation of the pavement structure;

[0056] Step 3: After the foundation pit maintenance wall 2 is dismantled to meet the design requirements and pass the acceptance check, the reinforced soil layer 5 is filled layer by ...

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Abstract

The invention discloses a construction process of a non-uniform settlement control structure for a high-speed railway tunnel passing through an airport road surface. To build plain soil, on-site pouring foam lightweight soil foundation in sections, partitions, and layers on the plain soil, or fill reinforced soil layers layer by layer, lay geogrids between the reinforced soil layers, and lay geogrids between the reinforced soil layers. Pave the geocell on the upper layer, pave gravel on the geocell, and set multiple deformation joints along the longitudinal direction; carry out the construction of the pavement structure layer and other auxiliary facilities, and adopt the above-mentioned construction technology to form uneven settlement of the subgrade control structure. The invention has the advantages of improving the overall uniformity of the soil foundation, adjusting the uneven settlement of the soil foundation, convenient construction, saving construction period, and successfully solving the problem of uneven settlement of the roadbed when the high-speed railway tunnel crosses the airport pavement.

Description

technical field [0001] The invention relates to the intersecting fields of airport engineering and high-speed rail engineering, in particular to a structure for controlling uneven settlement of a high-speed rail tunnel passing under an airport pavement subgrade and a construction process. Background technique [0002] In recent years, the number of comprehensive transportation hub projects has increased, and the projects are interlaced three-dimensionally. Moreover, high-speed railways and aircraft are more sensitive to settlement when they are running at high speed, and have higher requirements for settlement and uneven settlement. In the implementation process of the high-speed railway tunnel crossing the airport pavement, the backfilling of the foundation pit does not meet the requirements, resulting in uneven settlement, and there are frequent cases where reprocessing is required. The difficulty and cost of reprocessing are high, which is harmful to the safety of the airp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01C3/00E01C3/04
Inventor 张甲峰吕玺琳钱建固王伟李军世苏尔好翁锰森
Owner TONGJI UNIV
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