Method of reinforcing soil body for inlet and outlet cave mouths of tunnel shield

A technology of soil reinforcement and shield tunneling, which is applied in the direction of earth drilling, mining equipment, tunnels, etc., and can solve the problem of not solving the range of solids added by horizontal jet spraying

Inactive Publication Date: 2009-10-28
SHANGHAI JIAO TONG UNIV
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  • Abstract
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Problems solved by technology

However, this article does not solve the problem of how to determine the range of horizontal jet spraying and adding solids. The range of horizontal jetting adding solids involved is set in advance, and then some quantitative conclusions are given through correlation analysis on this basis

Method used

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  • Method of reinforcing soil body for inlet and outlet cave mouths of tunnel shield
  • Method of reinforcing soil body for inlet and outlet cave mouths of tunnel shield

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Embodiment

[0027] A shield tunnel in a subway section in Shanghai is tunneled at one end of the tunnel. The tunnel entry part of the shield tunnel is a soft ground. In order to prevent the ground from subsiding when the shield tunnel enters the tunnel, foundation reinforcement treatment is required to determine the scope of the reinforcement. The design target strength of the reinforced body is 1.0MPa, and the curing agent is ordinary Portland cement and silicate quick-setting agent water glass without environmental pollution.

[0028] The specific implementation steps are as follows:

[0029] (1) After detailed geological survey, the upper part of this part of the soil is composed of miscellaneous fill, plain fill and silty fill. The soil structure in this part is loose, with high natural water content, high compressibility, low shear strength, and the physical state is mostly soft plastic to flow plastic, so the engineering performance is poor. The 7m to 15m is muddy clay, with a weigh...

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Abstract

The invention relates to a method in the technical field of construction engineering, in particular to a method of reinforcing soil body for inlet and outlet cave mouths of tunnel shield, which comprises the following steps of: employing a Robertson method to explore the soil body surrounding the tunnel at the inlet and outlet cave mouths of subways, confirming a bearable largest live load and the distribution situation through applying an engineering analogue method, drilling holes on the field, selecting horizontal rotary-spray grouting materials according to the physical-mechanical parameters of a reinforcing body; carrying out partial experimental spraying construction in the soil body to be reinforced on the field as well as selecting the reinforcing bodies meeting the piling strength construction requirements in the soil body and the piling diameters of a construction site. The method in the technical field of construction engineering comprehensively considers each factor and confirms the range of the reinforcing bodies needed for reinforcing the inlet and outlet cave mouths of subways through high-pressure horizontal rotary-spray grouting by the comprehensive method combined by analyzing and judging. The method in the technical field of construction engineering is simple, reliable, economic and practical, can be suitable for confirming the reinforcing ranges of various soil bodies, and provides an important technical guarantee for successfully finishing the reinforcing engineering on the inlet and outlet cave mouths of subways.

Description

technical field [0001] The invention relates to a method in the technical field of construction engineering, in particular to a method for reinforcing the soil at the entrance and exit of a shield tunnel. Background technique [0002] In the construction of urban subways, in order to ensure the safety of shield tunnels entering and exiting the tunnel, the soil at the entrance and exit of the tunnel must have good self-support and compactness, so that the soil at the tunnel entrance will not collapse when the shield tunnel enters and exits the tunnel, and groundwater will not flow into the foundation pit through the tunnel. When the soil at the entrance and exit of the cave cannot be self-stabilized, it is necessary to reinforce the soil within a certain range near the entrance, and take measures to improve the physical and mechanical parameters of the stratum and improve the self-stabilization ability of the stratum. At present, the most commonly used methods are the vertica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00
Inventor 沈水龙孙阳罗春泳
Owner SHANGHAI JIAO TONG UNIV
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