Test method for forming mud membrane by using slurry shield under high pressure

Abstract

The invention discloses a test method for forming a mud membrane by using a slurry shield under high pressure. The method comprises the following steps of: taking undisturbed soil from a construction site, drying, sieving to remove big granules in the soil, and then filling the soil into a test barrel; opening an upper flange cover plate, flushing water to the test barrel in a radial water sprinkling shape, then covering the upper flange cover plate, and ensuring sealing between the upper flange cover plate and the test barrel; after the upper flange cover plate is sealed on the test barrel, pressing air to the upper part of the test barrel through an air compressor; discharging the water under the condition of maintaining the pressure; injecting fluorescent material added slurry to the upper part of the test barrel through a slurry pump; pressing air to the upper part of the test barrel through the air compressor to increase the pressure; pressing air to the upper part of the test barrel through the air compressor again; and horizontally placing the test barrel after the test is finished. By the method, the front stable mechanical mechanism of the slurry shield and the mechanical property of the soil can be researched.

Description

technical field [0001] The invention relates to a test method, in particular to a test method for forming a mud film by a mud-water shield under high pressure. Background technique [0002] Muddy water shield balances the stress in the stratum through the muddy water with pressure in the muddy water tank. In order to maintain the stability of the excavation surface, the muddy water function in the muddy water shield has the following requirements: 1. Use the muddy water pressure to balance the earth pressure and water 2. In order to make the mud-water pressure work effectively, a mud film with certain structural characteristics needs to be formed on the excavation surface; self-reliance. [0003] From the perspective of mud film function, as a water-repelling material and force-transmitting medium, mud film can make the pressure of the mud tank more evenly act on the excavation surface, but the formation of the mud film is not instantaneous, but the work The mud is gradual...

AI Technical Summary

Problems solved by technology

[0004] Due to the limitations of the current construction conditions and monitoring methods, it is impossible to judge the formation process of the mud film and the characteristics of the mud film itself by effective means at the construction site, so most of the current research work is done in the laboratory

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