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Slurry for SCAP (slurry, cake, air, pressure) type earth pressure balance shield bulk breaking and preparation method of slurry

A technology of earth pressure balance shield tunneling and preparation method, which is applied to earth square drilling, mining equipment, tunnels, etc., and can solve the problems of expensive mud for opening cabins, complicated preparation, and foreign transportation of muck, and achieves a simple and easy preparation method line, reduce environmental pollution, cost-effective effect

Active Publication Date: 2019-11-12
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a SCAP-type earth pressure balance shield opening mud and its preparation method, which solves the problems of expensive mud for SCAP earth pressure balance shield opening, complicated preparation and external transportation of muck during shield construction. technical problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] SCAP-type earth pressure balance shield opening mud preparation includes the following raw materials per cubic meter: 186kg of waste silt, 821kg of clear water, 274kg of calcium-based bentonite, 10.9kg of modifier, 2kg of viscosifier (including sodium carboxymethyl cellulose 1.6kg and polyacrylamide 0.4kg), the above raw materials are placed in a mud truck and mixed evenly for use.

[0032] The quality control index of the mud used for opening the cabin prepared in this embodiment is as follows: the density is 1.29g / cm3, and the viscosity value of the Martens funnel is 80s, which meets the engineering construction requirements.

Embodiment 2

[0034] Per cubic meter of gravel formation, the preparation of mud for pressure opening includes the following raw materials: 114kg of waste silt, 902kg of clear water, 227kg of calcium-based bentonite, 9.05kg of modifier and 0.6kg of viscosifier (wherein sodium carboxymethyl cellulose is 0.5kg and polyacrylamide 0.1kg), put the above raw materials in a mud truck and mix them evenly for use.

[0035] The quality control index of the mud for opening the cabin prepared by the present embodiment is: the density is at 1.25g / cm 3 , The Marsh funnel viscosity value is 67s, which meets the engineering construction requirements.

Embodiment 3

[0037] The preparation method of the slurry for opening the cabin of the SCAP type earth pressure balance shield comprises the following steps:

[0038] S1. Dry the waste silt produced when the shield tunneling into the silt or silty clay layer.

[0039] S2. Sieve the dried silt with a mesh size of 0.25 mm, and store the silt that has been sieved for subsequent use.

[0040] S3. When the shield machine needs to be opened under pressure, add silt, clear water, calcium-based bentonite, modifier and tackifier to the mud truck, specifically add 65 parts of silt, 500 parts of clear water, calcium Base bentonite 120 parts, modifier 4 parts, tackifier 1 part. Stir continuously at room temperature, the stirring speed is first fast and then slow, until the stirring is uniform.

[0041] S4. After uniform stirring for 6 hours, test the density and viscosity of the mixture in the mud truck, and the density of the mud is 1.28g / cm 3 , the Marsh funnel viscosity value is 75s, which meets ...

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Abstract

The invention discloses slurry for SCAP (slurry, cake, air, pressure) type earth pressure balance shield bulk breaking. The slurry comprises the following components in parts by mass: 50-80 parts of clay, 400-600 parts of clean water, 100-150 parts of calcium bentonite, 2-6 parts of an improver and 0-2 parts of a tackifier. The invention further discloses a preparation method of the slurry for SCAP type earth pressure balance shield bulk breaking. The preparation method comprises the following steps: performing air drying on waste powdered soil generated when a shield excavates into a powderedsand or powdered clay layer, performing screening, and storing the soil near a muck pit; when a shield needs pressurized bulk breaking, adding the stored powdered soil, the clean water, the calcium bentonite, the improver and t he tackifier into a slurry vehicle, and performing continuous stirring, so as to prepare a product which meets requirements of slurry on densities and viscosities. As muckdiscarded in the tunneling process is utilized, bentonite resources can be saved, the bulk breaking cost can be reduced, environment pollution caused by muck transportation can be reduced, and slurryfor bulk breaking, which meets requirements such as densities, viscosities and physical and chemical stability, can be prepared.

Description

technical field [0001] The invention belongs to the technical field of underground engineering construction, and in particular relates to a slurry for opening a SCAP type earth pressure balance shield tunnel and a preparation method thereof. Background technique [0002] With the rapid development of urbanization and urban rail transit in China, shield tunneling technology has become a key technology for the construction of subways and major tunnels in my country. Earth pressure balance shield construction is a common shield technology in subway construction. When crossing gravel and other strata, due to the high strength of the stratum, tool wear, collapse and even wear of the cutter head will generally occur. Therefore, shield tunneling is required. Opening the cabin and changing the tool for maintenance work of the mechanism. As the pressure opening method is gradually applied to the earth pressure shield engineering, the SCAP earth pressure balance shield opening method...

Claims

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Application Information

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IPC IPC(8): C04B28/00E21D9/06
CPCC04B28/001C04B2111/00732C04B2201/10C04B2201/20E21D9/06C04B18/16C04B22/002C04B22/10C04B24/383C04B24/2652
Inventor 朱伟钱勇进王璐徐超胡涧楠
Owner HOHAI UNIV
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