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Method for forming earth pressure balance shield mud film of water-rich round gravel stratum

A technology of earth pressure balance shield and round gravel, which can be used in earth-moving drilling, mining equipment, tunnels, etc., and can solve the problems of rarely using mud-water balance shield and limited land resources.

Inactive Publication Date: 2021-05-07
CHINA RAILWAY 16 BUREAU GRP BEIJING METRO ENG CONSTR +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] During the construction process of the mud-water balance shield, it is necessary to continuously input a large amount of mud water into the soil silo, and it is required to have enough mud water treatment sites on site. For engineering projects, the requisitioned land resources are limited, and mud-water balance shields are rarely used in current rail transit construction.

Method used

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  • Method for forming earth pressure balance shield mud film of water-rich round gravel stratum

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Embodiment 1

[0029] The application provides a method for forming an earth pressure balance shield mud film in a water-rich boulder formation, in which sodium-based bentonite and water are puffed at a mass ratio of 1:8, and the puffing time is 20 hours to prepare a bentonite slurry ;

[0030] Add foam agent diluent in bentonite slurry; foam agent diluent mass ratio is 1:2, foam agent concentration 3%, prepares bentonite mud,

[0031] The bentonite mud is covered on the surface of the earth pressure balance shield in the water-rich round gravel formation to form a mud film.

[0032] The foaming agent is Meigu SLF 41, its density at 20°C is 1010-1030kg / m 3 ; The pH value at 20°C is 7.5-8.5. When the foaming agent is mixed with the soil, the following properties can usually be obtained: reducing leakage and strengthening the compactness of the working surface.

[0033] The performance of described sodium bentonite is as follows:

[0034] Montmorillonite: 60%-88%; expansion capacity: 25-50...

Embodiment 2

[0036] The difference with embodiment 1 is:

[0037] The sodium-based bentonite and water are expanded according to the mass ratio of 1:10, and the expansion time is 20 hours to prepare a bentonite slurry;

[0038] Add the bentonite slurry to the diluent of the foam agent; the mass ratio of the diluent of the foam agent is 1:2, and the concentration of the foam agent is 5%, to prepare the bentonite mud.

Embodiment 3

[0040] The difference with embodiment 1 is:

[0041] The sodium-based bentonite and water are expanded according to the mass ratio of 1:12, and the expansion time is 20 hours to prepare a bentonite slurry;

[0042] Add the bentonite slurry to the diluent of the foam agent; the mass ratio of the diluent of the foam agent is 1:4, and the concentration of the foam agent is 5%, to prepare the bentonite mud.

[0043] Different from the mud-water balance shield, the mud film formed on the face of the earth pressure balance shield is not pressurized by a separate mud tank, but the well-proportioned mud acts on the face of the face through the muck improvement system. Because the improved muck has good fluidity, under the action of the pressure of the soil bin, it can continuously act on the excavation surface in front of the cutterhead, maintaining the mud film effect and realizing the stability of the excavation surface and water blocking.

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Abstract

The invention discloses a method for forming an earth pressure balance shield mud film of a water-rich round gravel stratum; the method comprises the steps: puffing sodium bentonite and water according to the mass ratio of 1: 8-1:10 for the puffing time of 18-22 hours, and preparing bentonite slurry; adding the bentonite slurry into a foaming agent diluent, wherein the mass ratio of the foaming agent to the diluent is 1:2-1:4, and the concentration of the foaming agent is 3-5%; preparing bentonite mud; and covering the surface of a water-rich round gravel stratum earth pressure balance shield with the bentonite slurry, and forming the mud film. Effective muck improvement is achieved, the effect of further forming the mud film is achieved, and the sealing performance of an excavation face is improved; soil body plasticity is improved, and the stability of the excavation face is effectively improved; the friction force in muck is reduced, and the abrasion of the muck to a cutterhead and a spiral conveyor is reduced.

Description

technical field [0001] The present application relates to the field of tunnel shield construction, in particular to a method for forming earth pressure balance shield mud film in water-rich round gravel stratum. Background technique [0002] During the construction process of using the shield method in the water-rich boulder formation, how to solve the problems of water gushing caused by groundwater and instability of the excavation surface when passing through the formation has always been a key and difficult point. In urban subway tunnels, it is necessary to pass through the ground Structures, underground pipelines and other existing structures, and the problem of controlling surface settlement also needs to be dealt with. In terms of shield selection, there are usually options: mud-water balance shield and mud-added (foam-added) earth pressure balance shield. [0003] During the construction process of the mud-water balance shield, it is necessary to continuously input a...

Claims

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Application Information

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IPC IPC(8): C04B28/00E21D9/06
CPCC04B28/001E21D9/0664E21D9/0678C04B2111/00732C04B2201/20C04B2201/10C04B22/002C04B2103/0068
Inventor 汪俊卻晓明付嵩岩王晓振吴琼屈超赵宝林许川栋贾爱东董子开
Owner CHINA RAILWAY 16 BUREAU GRP BEIJING METRO ENG CONSTR
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