Method for improving residue soil in shield pressure cabin at high-permeability complex formations

A technology with complex strata and high permeability, applied in earth-moving drilling, mining equipment, tunnels, etc., to achieve reasonable particle size distribution and gradation of slag, which is beneficial to construction efficiency and reduces improvement costs.

Inactive Publication Date: 2018-06-12
GUANGZHOU METRO GRP CO LTD +3
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Problems solved by technology

[0003] The invention provides a method for improving the dregs of shield tunnel pressure chambers in compl

Method used

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  • Method for improving residue soil in shield pressure cabin at high-permeability complex formations
  • Method for improving residue soil in shield pressure cabin at high-permeability complex formations
  • Method for improving residue soil in shield pressure cabin at high-permeability complex formations

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Embodiment 1

[0045] The Zhucun-Xiangling section of Guangzhou Metro Line 21 is mainly located on the Guangshan Highway in Zengcheng City, Guangzhou. It starts at Zhucun Station on the east side of Zhuangshui Village, and then continues eastward along the Guangshan Highway. The culvert passes through Songtian College of Guangzhou University and sets Xiangling Station on the east side of Yingyuan. The two sides of Guangshan Road are generally residential buildings, shops and other civil buildings. The houses are relatively dense, and most of them are two to six-story buildings. The main aquifers in the shield crossing section are silt-fine sand layer , medium-coarse sand layer , gravel sand layer , round gravel layer and silty clay layer . Groundwater exists in the form of pore water and is supplied by atmospheric precipitation and surface water, with moderate water abundance.

[0046] (1) The silty fine sand layer is light gray, yellowish brown, etc., saturated, slightly dense to medium ...

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Abstract

The invention discloses a method for improving residue soil in a shield pressure cabin at high-permeability complex formations. The method comprises the steps that (1) geological conditions of the shield passing formations are checked out and collected; (2) several kinds of representative complex formation working conditions are selected, and according to the proportions of the formations on the shield passing sections under each working condition, the particle size distribution curve of particles in mixed residue soil of the complex formation excavation-cutting sections is calculated; (3) theobtained particle size distribution curve of the mixed particles and an existing particle size distribution curve conforming to soil pressure balance type shield and formation adaptability are compared, and the particle size and the admixing quantity of the fine particles needing to be admixed in the high-permeability complex formation improving process are estimated preliminarily; and (4) the shield passing formations are sampled on site, the kind and the admixing quantity of residue soil improving admixtures are determined. The method has the advantages that the mixed effect of the coarse particle formations and the fine particle formations in the complex formations are considered, therefore, compared with the method that only residue soil improving of the coarse particle formations isconsidered, the method better conforms to the actual situation, and accordingly the cost of a residue soil improving method generally only considering the most unfavorable coarse particle formations in the prior art is reduced advantageously.

Description

technical field [0001] The invention relates to a method for improving the dregs of shield tunnel pressure chambers in complex strata with high permeability, and belongs to the technical field of underground engineering construction. Background technique [0002] When earth pressure balance shield tunneling encounters high-permeability formations, the spewing of the soil-discharge port of the screw-dozer often occurs, that is, the separation of soil and water occurs. A large amount of groundwater is discharged through the pressure chamber and the screw-dozer, resulting in a sudden drop in the pressure of the pressure chamber and opening. Safety accidents such as excavation surface collapse and surface subsidence occurred frequently. Therefore, shield tunneling through high-permeability formations has attracted great attention from the shield engineering and academic circles. During shield excavation, the chance of encountering a single high-permeability coarse-grained strat...

Claims

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Application Information

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IPC IPC(8): E21D9/06
Inventor 陈荣泰槐荣国钟小春王敏朱超陈旭泉
Owner GUANGZHOU METRO GRP CO LTD
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