Slurry shielding mud permeation film forming simulation test apparatus

Abstract

The invention discloses a slurry shielding mud permeation film forming simulation test apparatus which comprises a test barrel, permeable stone, a partition plate, a force transfer piston and a gas outlet. The permeable stone is arranged at the inner bottom of the test barrel, the partition plate is longitudinally slidably connected onto the permeable stone, the test barrel is divided into two portions which are in bilateral symmetry with each other, the force transfer piston is slidably connected into the test barrel, and the gas outlet is formed in a side wall of the test barrel; each portion of the test barrel comprises a water outlet, slim pipes and an overflow opening, the water outlets are formed in the bottom of the barrel, the slim pipes are arranged on the side walls of the barrel, and the overflow openings are formed in the side walls of the barrel.

Description

technical field [0001] The invention relates to a mud-water shield mud penetration film-forming simulation test device, which belongs to the technical field of measuring and testing equipment. Background technique [0002] Slurry pressurized balanced shields are increasingly used in the construction of urban subways and highway tunnels because of their good stratum adaptability. During shield construction, engineering accidents are often caused by the instability of the excavation surface, such as soil collapse or surface uplift. The mud seeps into the ground to form a mud film, and the mud pressure acts on the soil skeleton through the mud film, so the quality of the mud film is the main factor to maintain the stability of the excavation surface. To clarify the formation process of mud film and the adaptability of mud to different formations is the key to realize the stability control of excavation face and prevent the accident of excavation face instability. [0003] At ...

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Problems solved by technology

[0003] At present, in the actual engineering excavation, the situation of composite stratum is often encountered, and the existing conventional mud film formation simulation test device is a single soil layer experimental device, which cannot simulate the situation of composite stratum, so it is necessary to use the previous model test The device has been improved to achieve the following test requirements and objectives: clarify the difference in mud film quality of mud in different soil layers, including film formation speed, film thickness, film formation type, and the two types of mud films under different mud pressures. The difference in the seepage velocity of mud and water in the soil layer

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