Construction method of low-bearing-capacity soft rock tunnel

A construction method and technology of bearing capacity, applied in tunnels, tunnel linings, earth-moving drilling, etc., can solve the problems of continuous overall settlement, extrusion deformation, and self-stabilization of the face of the initial support, so as to improve the accuracy of construction. , The effect of simple construction and simple steps

Active Publication Date: 2021-09-07
CHINA RAILWAY 20 BUREAU GRP
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Problems solved by technology

However, the use of the three-step rule in soft rock tunnels with low bearing capacity has certain limitations, resulting in dangerous situations such as the tunnel face being unable to stabilize itself, extrusion deformation, and initial support continuous overall settlement.

Method used

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  • Construction method of low-bearing-capacity soft rock tunnel
  • Construction method of low-bearing-capacity soft rock tunnel
  • Construction method of low-bearing-capacity soft rock tunnel

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Embodiment Construction

[0056] Such as Figure 1 to Figure 4 The construction method of a soft rock tunnel with low bearing capacity is shown, excavating the soft rock tunnel constructed along the longitudinal extension direction of the tunnel, and during the excavation process, the soft rock tunnel is reinforced with jet grouting piles at the middle steps Step and base, the method comprises the following steps:

[0057] Step 1. Upper step excavation and upper primary support:

[0058] Excavate the upper steps of the soft rock tunnel to be constructed, and simultaneously perform upper primary support 2-1 on the upper cave body 1-1 formed by the excavation of the upper steps during the excavation process of the upper steps;

[0059] Step 2. Temporary inverted arch waist beam structure construction of middle steps:

[0060] Step 201: Excavate the middle bench for the soft rock tunnel to be constructed, and simultaneously carry out the middle primary support 2-2 for the middle cave body 1-2 formed by ...

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Abstract

The invention discloses a construction method of a low-bearing-capacity soft rock tunnel. The method comprises the following steps that firstly, conducting upper step excavation and upper portion preliminary bracing; 2, conducting middle step temporary inverted arch waist beam type structure construction; 3, conducting middle step surface jet grouting pile center point arrangement and PVC pipe installation; 4, conducting jet grouting pile reinforcement construction; 5, conducting lower step excavation, lower portion preliminary bracing and inverted arch preliminary bracing construction; 6, dismantling a temporary inverted arch waist beam type structure; 7, conducting tunnel inverted arch secondary lining; and 8, conducting tunnel arch wall secondary lining. The construction method is reasonable in design, easy and convenient to construct and good in using effect, a temporary inverted arch waist beam on the middle step surface is constructed, the temporary inverted arch waist beam and an excavated preliminary bracing on the upper portion are closed to form a ring, then jet grouting pile construction is conducted on the middle step surface, safe and reliable excavation construction of a lower hole body is guaranteed, the tunnel can safely penetrate through a soft rock stratum, and the tunnel structure stability is ensured.

Description

technical field [0001] The invention belongs to the technical field of excavation and reinforcement of soft rock tunnels, and in particular relates to a construction method for soft rock tunnels with low bearing capacity. Background technique [0002] Soft rock refers to engineering rock mass that can produce significant plastic deformation under the action of engineering force. Excavation methods for railway and highway tunnels in soft rock geology mainly include middle partition (CD) method, cross middle partition (CRD) method, double side wall pilot pit method (spectacles method), etc. In recent years, the three-step temporary inverted arch method has been adopted for the Class V surrounding rock tunnels with poor geological conditions and certain self-stabilization ability, which is conducive to the operation of large-scale mechanical equipment and improves work efficiency. However, the use of the three-bench rule in soft rock tunnels with low bearing capacity has certa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10E21D11/18
CPCE21D11/105E21D11/107E21D11/183Y02E10/20
Inventor 郭朋超梁永峰吴红兵王洪坤朱红桃李校珂
Owner CHINA RAILWAY 20 BUREAU GRP
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