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Construction method of earth-rock boundary tunnel crossing loess valley

A technology for tunnel construction and tunneling, which can be used in tunnels, tunnel linings, and earth-moving drilling, etc., and can solve problems such as collapse and deformation of face support.

Active Publication Date: 2020-10-30
CHINA RAILWAY 20 BUREAU GRP CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once the corresponding reasonable support measures are not adopted in the actual construction or the excavation method is improper, it is very likely to cause deformation of the support in front of the face of the tunnel, and even serious consequences of collapse

Method used

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  • Construction method of earth-rock boundary tunnel crossing loess valley
  • Construction method of earth-rock boundary tunnel crossing loess valley
  • Construction method of earth-rock boundary tunnel crossing loess valley

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Embodiment Construction

[0165] Such as figure 1 A construction method of an earth-rock boundary tunnel passing through a loess valley is shown, and the tunnel to be constructed has a cross section greater than 100m 2 And for large-section tunnels that pass through loess gullies, the length of the constructed tunnels is 60m to 100m; Figure 7 , the stratum where the loess gully is located is an earth-rock boundary stratum, and the earth-rock boundary stratum includes a loess layer 3 and a rock layer 4 below the loess layer 3, and the interface between the loess layer 3 and the rock layer 4 is an earth-rock interface The tunnel hole 1 of the constructed tunnel is divided into an upper hole body 1-1, a middle hole body 1-2 and a lower hole body 1-3 from top to bottom, and the upper hole body 1-1 is from the back to the front. The cave body formed after the excavation of the upper steps of the construction tunnel, the middle cave body 1-2 is the cave body formed after the middle step excavation is carri...

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Abstract

The invention discloses a construction method of a soil-stone boundary tunnel passing through loess valleys. The construction method comprises the following steps of 1, precipitation pre-reinforcement; 2, excavation construction of a rear side tunnel section; 3, excavation construction of a middle tunnel section; and 4, excavation construction of a front side tunnel section, wherein the middle tunnel section and the front side tunnel section are three-step synchronous excavation tunnel sections; and in the excavation process from back to front in the step 2, the step 3 and the step 4, primarysupport is synchronously carried out on the excavated tunnel from back to front, and secondary lining of the tunnel is constructed on the inner side of the constructed and formed tunnel primary support structure from back to front. The construction method is reasonable in design, simple and convenient to construct and good in use effect, the underground water level is reduced through precipitationpre-reinforcement, surrounding rock is effectively reinforced, then blasting excavation is carried out in a three-step excavation mode, so that the excavation process of the soil-stone boundary tunnel passing through the loess valleys can be ensured to be safe and reliable, and the stability of the tunnel structure can be ensured.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a construction method for an earth-rock boundary tunnel passing through loess valleys. Background technique [0002] Loess refers to sediments of yellow silt transported by wind during the Quaternary period in the geological era. Loess collapsibility coefficient (also called collapsibility coefficient) is a mechanical parameter to evaluate the collapsibility of loess. Under a certain pressure, loess collapsibility coefficient refers to the ratio of the difference between the height of the soil sample before and after soaking in water and the original height of the soil sample. The collapsibility coefficient of loess is an important index to evaluate the collapsibility of loess, which can be directly measured by experiment. According to the different collapsibility coefficient of loess, loess can be divided into collapsible loess and non-collapsible loess....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D11/10E21D11/18E21D21/00E21D9/00
CPCE21D9/00E21D9/006E21D11/10E21D11/102E21D11/105E21D11/18E21D21/00
Inventor 谢江胜王建军马传明刘之涛张会安吴小波曹运祥高王峰申运涛李强张良梁永峰张博
Owner CHINA RAILWAY 20 BUREAU GRP CORP LTD
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