A horizontal test device for simulating layered formation mud penetration and soil mechanical properties change

Abstract

The invention relates to a horizontally simulating dynamic film-forming process of layered stratum mud infiltration, and can measure the temporal and spatial dynamic changes of soil mechanical properties during mud infiltration and the change of soil microstructure before and after mud infiltration. The device includes: a test transparent cylinder, a pressure mechanism, a soil measurement mechanism, a scanning electron microscope, and a support mechanism. The invention can simulate the layered strata in the actual project by adding different types of soil, measure the temporal and spatial dynamic changes of the soil pressure and excess pore water pressure in the mud infiltration process, and observe the dynamic film-forming process of the layered stratum mud infiltration; Errors due to dead weight improve accuracy. The device more intuitively and accurately simulates the dynamic film-forming process of the mud infiltration into the front stratum, and measures the temporal and spatial changes of the mechanical properties of the stratum soil during the mud infiltration and the microstructure changes of the soil before and after the mud infiltration, so as to provide mud infiltration for practical engineering. dynamic changes.

Description

technical field [0001] The invention relates to the technical field of underground engineering testing equipment, in particular to a horizontally simulated stratified stratum mud penetration and stratum soil mechanical property change testing device and method. Background technique [0002] With the rapid development of my country's underground engineering construction technology, no matter in the construction of highways or railway tunnels across rivers (rivers) and seas (lakes), urban rail transit tunnels, or municipal underground pipeline projects, mud-water balance shields and mud-water balance roofs Pipes have been widely used, and the common feature of both is that mud is injected into the front formation during construction, and the mud permeates and forms a dynamic film to maintain the stability of the excavation surface. At the same time, as the excavation depth of underground engineering continues to increase, there are natural sedimentary strata with different mech...

AI Technical Summary

Problems solved by technology

During the test process, the self-weight can easily lead to large errors in the test results, and there are layered strata on the excavation surface in the actual engineering construction. Therefore, the current indoor simulation test has certain defects in reflecting the actual construction.

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