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Construction Method of Core Soil at the Upper Part of Tunnel Micro-three Steps

A core soil, three-step technology, applied in tunnels, tunnel linings, earthwork drilling, etc., to control deformation and damage, ensure construction safety, and shorten the ring formation time.

Active Publication Date: 2019-09-17
THE 1ST ENG CO LTD OF CHINA RAILWAY 25TH BUREAU GRP +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] 2. The adverse effects of groundwater

Method used

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  • Construction Method of Core Soil at the Upper Part of Tunnel Micro-three Steps
  • Construction Method of Core Soil at the Upper Part of Tunnel Micro-three Steps
  • Construction Method of Core Soil at the Upper Part of Tunnel Micro-three Steps

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Embodiment Construction

[0035] The technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. It should be understood that the specific embodiments described here are only used to explain the present invention, and are not intended to limit the protection scope of the present invention.

[0036] see Figure 1 to Figure 3 , the present invention provides a construction method for the core soil at the upper part of the micro three steps of the tunnel, the construction method includes the following steps:

[0037] Step 1, excavation of the upper step 1: perform arch support 2 in advance, excavate the upper step 1, the excavation height of the upper step 1 is about 4m, and the excavation span ratio of the upper step 1 should be greater than 0.3. During construction, the upper step 1 arc-shaped pilot pit is excavated in a circular direction, and the upper core soil 3 is retained. ...

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Abstract

The invention provides a tunnel micro-three-step upper core soil construction method. The tunnel micro-three-step upper core soil construction method comprises the steps that first, an arch advance support is constructed, an upper step arc-shaped pilot tunnel is excavated, and upper core soil is retained and gradually removed with the tunnel surface excavation; second, an advance middle step is excavated, at the same time, a middle step rock-soil body of about 2 / 3 excavation width of the middle step is excavated, and 1 / 3 of a following middle step rock pillar is retained; third, a following middle step is excavated, and the following middle step rock pillar is gradually removed; fourth, an advance lower step is excavated, at the same time, a lower step rock-soil body of about 1 / 3 excavation width of the lower step is excavated, about 1 / 3 of the rock-soil body in the middle is trimmed into a slope as a passage for machines and equipment, and about 1 / 3 of a following lower step rock pillar; fifth, a following lower step is excavated, and the following lower step rock pillar and the passage are gradually removed; and sixth, the tunnel bottom is excavated. The construction method effectively controls the deformation and deformation fracture of an initial support system, ensures the safety of tunnel construction, and improves the tunneling efficiency of a tunnel.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a construction method for the core soil at the upper part of the micro-three steps of the tunnel. Background technique [0002] The Songpan Tunnel and Hongqiaoguan Tunnel of the newly-built railway Chengdu-Lanzhou Line are located in Songpan County, Aba Prefecture, Sichuan Province, with a ground elevation of 2950 to 3510m. (1) Songpan Tunnel starts and ends from D4K239+630 to D3K247+678, with a total length of 8048m. It is a double-track railway tunnel. The tunnel body is located 170 to 600m to the right of the southern section of the Holocene Minjiang active fault zone; the surrounding rock of the tunnel is Triassic Carbonaceous slate interbedded with sandstone and slate, grayish-white, gray, fine-grained-fine-grained structure, clear bedding, thin-layered structure, and white calcite veins can be seen; affected by the regional structure, the rock mass is severely c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/00E21D11/00
CPCE21D9/00E21D11/003
Inventor 万炳宏鲜国张建慈周跃峰李传富张伦冯正宿春亮兰文庆王海杰魏晓江欧剑张涛王彦东尹厚继王建兴姚培儒王生涛李世君崔宏章其他发明人请求不公开姓名
Owner THE 1ST ENG CO LTD OF CHINA RAILWAY 25TH BUREAU GRP
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