A true triaxial seepage characteristics and strength test device for large-scale soil samples

Abstract

The invention discloses a large-scale soil sample true triaxial seepage characteristic and strength test device, which comprises a frame, which consists of a test frame base (28) arranged parallel to each other, a rigidity test pressurized platform (23) and a rigid The pressurized reaction force frame beam (22) is composed of, wherein, the described test frame base (28) is connected and fixed by the base column (27) between the rigid test pressurized platform (23), and the described rigid test pressurized platform (23) is connected and fixed with the rigid pressurization reaction frame crossbeam (22) by four rigid pressurization reaction frame columns (21) respectively positioned at its four sides, on the described rigidity test pressurization platform (23) A pressure chamber a is provided. The invention can well study the soil deformation and strength change problems caused by foundation pit excavation and unloading, and is especially suitable for unloading confining pressure test of deep soil.

Description

technical field [0001] The invention relates to the fields of civil engineering and water conservancy engineering, in particular to a true triaxial seepage characteristic and strength test device for large-scale soil samples. Background technique [0002] With the construction of large-scale civil and water conservancy projects, the scope of engineering body force influence gradually involves the deep surface soil section, and the force state is becoming more and more complex. Therefore, the stability of the project during the construction process and the groundwater level changes in the later period will cause foundation problems. Factors such as settlement deformation and seepage that lead to changes in soil strength can easily cause engineering problems. And summer rains lead to natural disasters such as landslides and mudslides in mountainous areas, destroying towns, villages, blocking traffic, causing property losses and casualties. These are the failure to scientifica...

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Problems solved by technology

[0003] At present, there are false triaxial test and true triaxial test in the soil strength test, but there are the following disadvantages: the false triaxial test cannot measure the strength of the soil under three-dimensional unequal pressure, which is not different from the actual engineering soil force; The triaxial test uses two pairs of flexible lateral pressurized water bladders to apply unequal lateral pressures, which is likely to cause distortion of the soil sample and cause large deviations in test results. The impact of the test results on the lateral pressurized rubber bladder is very thin, so the lateral pressure cannot be too large; when the rubber bladder is thicker, the force causing the expansion of the rubber bladder can no longer be ignored, and a large error will be introduced

) makes the test stress level low, and it is impossible to carry out the deformation and strength characteristics test of deep soil under high stress state, and there are few related test devices for studying the stress state on soil seepage characteristics, and the test soil sample size is small, and the boundary effect The impact of large, can not truly reflect the soil strength and seepage characteristics

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