Complete earth pressure balance shield construction soil mass improvement test method

A technology of earth pressure balance shield and test method, which is applied in soil material testing, material inspection products, instruments, etc., can solve the problem of less research on soil pressure distribution and pressure transfer law in soil cabin, and less research on soil performance. , there is no set of test methods, etc.

Inactive Publication Date: 2012-02-22
BEIJING UNIV OF TECH
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Problems solved by technology

In addition, the design of the shield machine model is generally relatively simple. It mainly studies the stability of the face during the construction of the shield and the soil deformation and stress change characteristics after the tunnel is formed. There are few studies on the performance of the soil inside the shield machine. In particular, there are few studies on the pressure distributi

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  • Complete earth pressure balance shield construction soil mass improvement test method
  • Complete earth pressure balance shield construction soil mass improvement test method
  • Complete earth pressure balance shield construction soil mass improvement test method

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Embodiment Construction

[0036] A set of earth pressure balance shield construction soil improvement test method of the present invention, its implementation steps are as follows:

[0037] Step 1: Additive test. Including foam test and mud test, first use different concentrations of foaming liquid (generally 1%, 2%, 3%, 4%, 5%, 6%) to produce foam, and evaluate the foam performance; secondly, according to the particle size of the soil sample Match curves to prepare mud with different concentrations, so that the fine particles in the soil layer can reach 20% to 30%.

[0038] Use the half-life test rack to measure the expansion ratio and half-life of the foam to evaluate the foam performance, such as figure 2 As shown, the half-life test rack includes a cylinder 1-1, a funnel 4-1, a filter screen 3-1, a tripod 2-1, a container 5-1 and an electronic balance 6-1. The material of the cylinder 1-1 is plexiglass, a container for storing foam, one end of the cylinder 1-1 is connected to the funnel 4-1, and...

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Abstract

The present invention discloses a complete earth pressure balance shield construction soil mass improvement test method, and belongs to the technical field of the tunnel construction. According to the present invention, a set of test methods for evaluating commonly-used additives in the shield construction and performances of the improved soil mass are designed; a foam test and a mud test are adopted to prepare and evaluate the performances of the additives; a slump test, a stirring test, a friction test, and an earth pressure tank model test are adopted to evaluate the performances of the improved soil mass, and study the fluidity, the vicidity, the friction performance, the permeability and the force transmission performance of the improved soil mass, determine the performance evaluation standard of the improved soil mass, and provide an additive proportion optimizing scheme for the earth pressure balance shield construction. With the set of the test methods and the process, the performances of the additives and the improved soil mass can be comprehensively evaluated; the test scheme is scientific and reasonable; the applicable soil mass of the test method has wide types; the test effect is significant; the test method and the evaluation standard are provided for effectively and economically adopting the additives for improving the soil mass in the earth pressure balance shield construction in different stratums.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a set of standard test methods for evaluating the properties of additives and improved soil, determining the evaluation standard for improved soil, and optimizing the proportioning scheme of additives for earth pressure balance shield tunneling construction. Background technique [0002] The basic principle of the earth pressure balance shield tunneling method is: the soil chamber is filled with the soil with good plastic flow state excavated by the cutter head, and the soil pressure in the soil chamber is controlled by the advancing speed of the shield machine and the soil discharge speed of the screw earthmover to balance The soil pressure and water pressure of the tunnel face ensure the stability of the tunnel face during the excavation process and realize the smooth construction of the shield. However, due to the difference in stratum conditions, the s...

Claims

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Application Information

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IPC IPC(8): G01N11/00G01N15/08G01N19/02G01N33/24
Inventor 龚秋明姜厚停周永攀
Owner BEIJING UNIV OF TECH
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