Three dimensional earth pressure testing device and assembly computing method based on general earth pressure cells and rhombic dodecahedron

Abstract

The invention provides a three dimensional earth pressure testing device based on general earth pressure cells and a rhombic dodecahedron. According to the device, six general earth pressure cells are fixed onto six surfaces, of which the normal vector quantities are uncorrelated, of the rhombic dodecahedron, so that the three dimensional earth pressure testing device is formed; grooves used for accommodating earth pressure cells are arranged on the surfaces of the rhombic dodecahedron with uncorrelated normal direction vector quantities; a conducting wire hole leading to the centroid of the rhombic dodecahedron is formed in the center of each groove; a conducting wire converging hole leading to the centroid is formed in each surface center of the rhombic dodecahedron except the grooves, so that six conducting wire holes and the converging holes converge at the centroid; meanwhile, a method for assembly and compute the three dimensional earth pressure testing device is provided. The invention has the effect that the three dimensional earth pressure testing device obtain, through testing, three principal stress of the earth pressure in the principal directions with measuring accuracy of 1.22 Rho, the measuring accuracy of three shearing stress is 0.71 Rho, the average measuring accuracy is 0.965 Rho, the safety storage of the engineering construction is improved, and the health condition of the engineering in later period can be effectively evaluated.

Description

technical field [0001] The invention belongs to the technical field of stress testing in engineering, and specifically relates to a three-dimensional earth pressure testing device and an assembly calculation method based on an ordinary earth pressure cell and a rhombic dodecahedron. The soil pressure on the relevant surface is then calculated to obtain the three-dimensional stress state at the test soil body, so as to further obtain the direction and value of the maximum compressive stress in the soil body. Background technique [0002] The three-dimensional stress test of concrete and rock and soil is a basic work in engineering, and it is the prerequisite for quantitative mechanical analysis and engineering safety evaluation, and plays an irreplaceable role. Especially in infrastructure projects such as civil engineering, water conservancy engineering, and transportation engineering, the stress state of materials such as concrete and rock and soil can be accurately obtaine...

AI Technical Summary

Problems solved by technology

Obviously, under this condition, the surface where the earth pressure cell is located is affected by friction, and the presence of shear force on this surface is not the main plane. Naturally, the earth pressure measured by this method is not the maximum principal stress.

The previous one-way or three-way earth pressure test methods can only obtain the earth pressure in a certain direction, but cannot obtain the maximum earth pressure of the test position, let alone the stress state of the test position

Moreover, due to deformation and displacement of soil and retaining structures, the preset "fixed direction" is often difficult to control

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