Regular dodecahedron-based three-dimensional stress state testing device and operation method

Abstract

The invention provides a device based on a regular dodecahedron base and six common earth pressure cells. An earth pressure cell groove is formed in the six faces, non-parallel to each other, of the regular dodecahedron base respectively; the six common earth pressure cells are fixed on the six grooves respectively; the gap between each groove and each common earth pressure cell is filled with an expansion water stop ring; a wire hole for guiding a data wire of the common earth pressure cell to the center of the regular dodecahedron is formed in each groove; a wire gathering hole is formed in any face of the regular dodecahedron base without a groove; and the data wire is connected with an earth pressure cell testing and reading element. The invention also provides an operation method of the regular dodecahedron-based three-dimensional stress state testing device. The beneficial effects are as follows: the stress state of a point in an earth body is accurately and conveniently obtained, the error of the traditional way of pasting a strain rosette to reflect stress is improved, and the average test precision is 0.81rho. Through the precision improvement, the conventional stress state of the earth body can be reflected more accurately, and the safety stock of a project is improved.

Description

technical field [0001] The invention belongs to the field of soil stress testing, in particular to a three-dimensional stress state testing device based on a regular dodecahedron and an operation method. Background technique [0002] The thickness of the soil is different and the properties are different, so its stress test is a relatively difficult but basic work. In order to study the strength and deformation of soil in depth, it is first necessary to have a full understanding of the stress state of the soil. In actual engineering constructions such as civil engineering, water conservancy engineering, and environmental engineering, it is of great value to obtain the stress state of the soil directly and accurately for the safety analysis, structural protection and scientific research of the soil. [0003] Currently, stress testing of soils can be done with earth pressure cells and stress gauges. The stress state in a certain direction can be obtained by arranging earth p...

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