Testing device and method for permeation of slurry in soil layer

Abstract

The invention relates to a testing device for permeation of slurry in a soil layer.The device comprises a soil sample holder, a first high-pressure air source, a slurry pipe, a second high-pressure air source and a leading-out pipe.A soil layer sample remodeled according to the pressure of a stratum where the stratum sample is located is clamped in the soil sample holder.The first high-pressure air source is connected with the soil sample holder and used for applying surrounding pressure to the soil sample holder.The slurry pipe is arranged in the soil sample holder and filled with slurry, the top end of the slurry pipe is of a sealed structure, the bottom end of the slurry pipe is of an open structure, and the bottom end of the slurry pipe is in contact with the upper surface of the stratum soil sample.The second high-pressure air source is connected with the top end of the slurry pipe and used for applying axial pressure to the slurry pipe.The leading-out pipe is connected to the end, corresponding to the lower surface of the stratum soil sample, of the soil sample holder and used for leading out slurry filter liquid permeating out of the stratum soil sample.The problem that the pressure borne by a sample is not considered in the prior art is solved, and a result measured through the testing device is more accurate and more reliable.

Description

technical field [0001] The invention relates to the field of mud penetration testing, in particular to a testing device and a testing method for mud penetration in soil layers. Background technique [0002] Maintaining the stability of excavation holes (troughs) is the most important role of mud in projects such as underground diaphragm walls, bored piles, and mud-water shield construction methods. It is through the formation of mud skins on the surface of the stratum by mud that the mud pressure balances the formation. Soil and water pressure. Among them, the formation of mud skin is a problem of mud penetration in the formation, but there are few studies on the formation mechanism of mud skin and penetration tests under two-dimensional pressure conditions. [0003] At present, there is no special test instrument for mud penetration and film formation. The existing literature discloses that: in order to simulate the process of mud infiltration in the formation, a mud pres...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of the prior art, to provide a mud penetration test device and test method in the soil layer, to solve the problem that the existing test device cannot simulate the real seepage state in the formation so that the measured seepage volume is inaccurate question

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