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Subway tunneling underground excavation method

A technology of tunneling and underground excavation, which is applied in the direction of tunnels, tunnel linings, underground chambers, etc. It can solve problems such as ground deformation, increase construction risks, and affect the safety of ground buildings, and achieve the effect of ensuring safety

Active Publication Date: 2020-05-12
合肥市轨道交通集团有限公司
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Problems solved by technology

During the actual construction process, people have gradually discovered that: on the one hand, the excavation of shallow buried tunnels will cause surface settlement and stratum deformation, and when the settlement deformation is too large, it will increase construction risks and affect the safety of ground buildings

Method used

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  • Subway tunneling underground excavation method
  • Subway tunneling underground excavation method
  • Subway tunneling underground excavation method

Examples

Experimental program
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Embodiment

[0074] Location: Hefei City;

[0075] Divide the area: divide the soil layer within 50m from the surface to the bottom of the tunnel;

[0076] Division process: According to the depositional age and genetic type, the layers are divided into 8 layers, of which there are 5 layers of soil (including the filling layer), and 3 layers of bedrock; according to the soil state of the formation, there are 14 subgroups. The division process and results are shown in Table 3.

[0077] Table 3 Stratum division results along the subway tunnels in Hefei

[0078]

[0079]

[0080] Select strata within the range of 50m from the surface of the above soil layer to the bottom of the tunnel for combination to form multiple sets of stratum combinations to be selected, and calculate the stratum combination engineering property model SCI of each stratum combination. Taking two subway tunnels with the same tunnel section size and tunnel construction scheme in Hefei as an example, the strata com...

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Abstract

The invention belongs to the technical field of tunnel engineering, and particularly relates to a subway tunneling underground excavation method. The method comprises the two steps of stratum combination engineering property model calculation and tunnel shallow-buried excavation construction. The stratum combination engineering property model calculation step comprises the steps that a stratum along a tunnel is divided into a stratum group and a subgroup, and the divided stratum combination is expressed through the stratum group and the subgroup; and selecting stratums in a range of 50m belowthe earth surface and the tunnel bottom for combination, substituting the stratums into the stratum combination engineering property model for calculation and analysis, and then performing a tunnel shallow-buried excavation construction process. According to the method, the engineering geological stratification within the range of 50 m of the influence depth of tunnel engineering construction is divided and deeply analyzed, so that the engineering geological stratification of the whole site is generally generalized, the construction process can be closely followed, and it is ensured that the shallow-buried excavation tunnel construction process is safely and smoothly carried out.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering, and in particular relates to a subway tunnel excavation method. Background technique [0002] As a construction method often used in the construction of urban subway projects, tunnel shallow burial and underground excavation method has the characteristics of low cost, flexible and changeable, and less interference to traffic and surrounding environment. There have been many successful precedents in subways. Construction technology is also becoming more and more mature. During the actual construction process, people have gradually discovered that: on the one hand, the excavation of shallow buried tunnels will cause surface settlement and stratum deformation. When the settlement deformation is too large, it will increase the construction risk and affect the safety of ground buildings. And because the historical causes of the surface strata in the same area are similar, the composition a...

Claims

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Application Information

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IPC IPC(8): E21D9/00E21D11/14E21D20/02E21D21/00
CPCE21D9/00E21D9/001E21D11/14E21D20/02E21D21/0026
Inventor 陈华李孔军阮亮周仕波朱传孔夏成旭杨新安丁春林马明杰田静
Owner 合肥市轨道交通集团有限公司
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