True-triaxial seepage characteristic and strength testing device for large-size soil sample

Abstract

The invention discloses a true-triaxial seepage characteristic and strength testing device for a large-size soil sample. The device comprises a stand; the stand consists of a test frame base (28), a rigid test pressurizing platform (23) and a rigid pressurizing reaction frame cross beam (22) which are parallel to one another, wherein the test frame base (28) is connected and fixed with the rigid test pressurizing platform (23) by a base stand column (27); the rigid test pressurizing platform (23) is connected and fixed with the rigid pressurizing reaction frame cross beam (22) by four rigid pressurizing reaction frame stand columns (21) which are respectively arranged at the four sides; and the rigid test pressurizing platform (23) is provided with a pressure chamber a. After the true-triaxial seepage characteristic and strength testing device is used, the problems of soil deformation and strength change which are caused by unloading of pit excavation can be well researched, so that the device is especially suitable for an 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...

AI Technical Summary

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

Images