Consolidation apparatus for measuring static earth pressure coefficient and small strain shear modulus

Abstract

The invention relates to a consolidation apparatus for measuring static earth pressure coefficient and small strain shear modulus, which comprises a consolidation apparatus container equipped with a soil sample and provided with a loading plate used for connecting with a loading device; Two pairs of film pressure transducers symmetrically arranged at left and right side surfaces as well as upper and down inner walls of the consolidation apparatus container; three pairs of bending element wave velocity test components symmetrically arranged at six side surface groove holes of the consolidation apparatus container; and an synthetic glass observation window embedded at front side surface of the consolidation apparatus container. Compared with prior art, the stress on horizontal and vertical directions of earth can be simultaneously measured, static earth pressure coefficient can be determined, small strain shear modulus of anisotropy earth can be obtained during a complete lateral confinement loading / unloading process, development condition of anisotropy of earth structure can be observed by using the synthetic glass observation window and a high definition digital camera as well as combining a PIV image processing technology, and the consolidation apparatus has the advantages of simple operation, various functions, high testing precision and little error.

Description

technical field [0001] The invention relates to the technical field of rock and soil test research, in particular to a consolidation instrument capable of measuring static earth pressure coefficient and small strain shear modulus. Background technique [0002] With the rapid development of urban construction in our country, the process of urbanization has promoted the rapid development of large cities in terms of number and scale. People will continue to expand new living spaces, develop underground spaces that go deeper into rock and soil, and build higher and higher super high-rise buildings. In order to ensure the safety and economy of these projects, the accuracy required in the calculation and analysis is getting higher and higher. There are many factors to be considered to improve the calculation accuracy. One of the key factors to be studied is the effect of anisotropy on soil properties. influences. [0003] Soil is a product of nature, and it will produce a certai...

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Problems solved by technology

At present, it is a suitable method to quantitatively characterize the degree of anisotropy of soil by the anisotropy of small-strain shear modulus. Very limited understanding of the intrinsic relationship between initial anisotropy and induced anisotropy of soil structures

[0005] In addition, there are several prominent problems in determining the important parameter of static earth pressure coefficient by traditional test instruments, including: "Okochi, Y., Tatsuoka, F.: Some factors affecting K0-values ​​of sand measured in triaxial cell .Soils Found.24(3),52–68(1984)” mentioned that the side strain in the triaxial instrument or the plane strain consolidation instrument is too large to realize the complete confinement condition, the literature “Takashi, T, Yoshiaki, K.:K0consolidation of undisturbed clays by means of triaxial cell.Soils Found.31(3),127–137(1991)” mentioned that the drainage wallpaper between the rubber film of the triaxial instrument and the soil sample is too flexible, The consolidation instrument mentioned in the literature "Yamamuro, J.A., Bopp, P.A., Lade, P.V.: One-dimensional compression of sands at high pressures. J. Geotech. Eng. 122(2), 147–154(1996)" cannot be compared Accurate determination of horizontal stress and residual strain in the ring body during unloading, etc.

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