Large-scale in-situ triaxial shear test device and method thereof

Abstract

The invention discloses a large-scale in-situ triaxial shear test device and a method thereof, and belongs to the technology of mechanical property test of soil in the field of geotechnical engineering. The device comprises a sample (10), a confining pressure system (20), a vertical pressure system (30), a counterforce system (40) and an automatic data acquisition system (50); the sample (10) is arranged in the confining pressure system (20); the vertical pressure system (30) and the counterforce system (40) are respectively arranged above and below the confining pressure system (20); and a vertical displacement meter of the automatic data acquisition system (50) is arranged in the sample (10). Compared with the prior art, an original structure of the sample can be maintained; confining pressure can be applied to the sample; an in-situ stress field of a measured soil body can be reproduced; the soil body can be damaged along the weakest surface thereof; and the size of the sample is large, so that the size effect influence is reduced. The large-scale in-situ triaxial shear test device and the method thereof have the characteristics of being real and comprehensive on the issue of researching the shear strength of the soil body; and test data are reliable, and powerful guarantee is provided for design and construction in the field of geotechnical engineering.

Description

technical field [0001] The invention belongs to the testing technology of mechanical properties of soil in the field of geotechnical engineering, and in particular relates to a large-scale in-situ triaxial shear test device and its method, and is especially suitable for measuring the mechanical parameters of in-situ soil samples under confining pressure . Background technique [0002] In order to obtain the shear strength index of coarse-grained soil, many universities and research institutes at home and abroad are committed to researching large-scale test equipment, such as large-scale indoor triaxial shear test equipment, large-scale indoor (in situ) direct shear test equipment, etc., although It has achieved fruitful results and provided a guarantee for the understanding and research of coarse-grained soils, but there are still the following deficiencies: [0003] 1. The large-scale indoor triaxial shear test device can only perform soil remodeling sample mechanical test...

AI Technical Summary

Problems solved by technology

[0003] 1. The large-scale indoor triaxial shear test device can only perform soil remodeling sample mechanical tests, which cannot fully represent the mechanical properties of the original structure characteristics of the coarse-grained soil at the engineering site;

[0004] 2. The large-scale in-situ direct shear test device can only perform mechanical tests along the predetermined horizontal plane, and the shear plane is not the weak surface of the soil, so the test results cannot reflect the real shear strength performance of the soil

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