Method for predicting stability of tunnel grout-stopping wall under full-section grouting

A full-section grouting and stability prediction technology, applied in the field of infrastructure construction, can solve problems such as unreliable, failure of grout stop wall support function, insufficient thickness of grout stop wall, etc., achieve reliable results, strong process, and use convenient effect

Active Publication Date: 2022-03-08
FUJIAN UNIV OF TECH
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  • Abstract
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  • Claims
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Problems solved by technology

However, when the grouting pressure of the grouting wall is too high, or the thickness of the grouting wall is insufficient, the grouting wall may slide along the bottom of the tunnel to the outside of the tunnel, and then the retaining function of the grouting wall will fail
So far, the stability of the grout-stop wall under the action of grouting pressure is mostly judged by engineering experience, and there is no reliable theory to guide it.

Method used

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Embodiment Construction

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are part of the present invention Examples, not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0025] During the excavation and construction of a railway tunnel in the southeast coast of my country, a weak broken zone was encountered, and a water and mud inrush disaster occurred. For high-pressure grouting, in order to ensure that the grout-stop wall remains stable under the action of grouting pressure, the method of the present invention is used to predict the stability of...

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Abstract

The invention relates to the field of infrastructure construction, in particular to a method for predicting the stability of a tunnel grouting-stopping wall under full-section grouting, which comprises the following steps: 1) measuring the vault elevation Z1 and the bottom elevation Z2 of a tunnel; (2) measuring and calculating the ground elevation Z3 of the water and mud bursting position of the tunnel, the mud surface elevation Z4 after water and mud bursting and the underground water level Z5; 3) acquiring characteristic data of the water-inrush and mud-inrush soft soil body below the underground water level: saturation weight gamma sat, effective weight gamma ', internal friction angle and static soil pressure coefficient K0; (4) the horizontal soil pressure sigma1x at the top face of the grout stopping wall, the horizontal soil pressure sigma2x at the bottom face of the grout stopping wall, the water pressure sigmaw1 at the top face of the grout stopping wall, the water pressure sigmaw2 at the bottom face of the grout stopping wall and the gravity G of the grout stopping wall are calculated; (5) the total horizontal thrust T borne by the grout stopping wall and the horizontal thrust resistance R of the grout stopping wall are calculated, and the stability of the grout stopping wall is judged according to R and T; if R is larger than or equal to T, it is judged that the grout stopping wall is in a stable state; and T, judging that the grout-stopping wall is in an unstable state.

Description

technical field [0001] The invention relates to the field of infrastructure construction, in particular to a method for predicting the stability of a grout stop wall of a tunnel under full-section grouting. Background technique [0002] When tunnels are excavated to weak zones such as fault fracture zones and intrusion contact zones, water and mud inrush disasters are likely to occur. Once the above-mentioned dangers occur in the tunnel, concrete grout-stop walls are generally used to support it, and then the grout-stop wall is used to carry out Grouting is performed on the entire section to reinforce the weak rock and soil mass behind. After the rock and soil mass is strengthened, the grout stop wall is gradually removed for excavation. However, when the grouting pressure of the grouting wall is too high or the thickness of the grouting wall is insufficient, the grouting wall may slide along the bottom of the tunnel to the outside of the tunnel, and then the retaining funct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D21/02
CPCG01D21/02Y02E10/20
Inventor 陈华艳罗才松周亦涛詹金武张丙强付朝江
Owner FUJIAN UNIV OF TECH
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