Mini three dimensional effective stress box and test method of the same

Abstract

The invention provides a mini three dimensional effective stress box. The mini three dimensional effective stress box is characterized in that a skeleton of the stress box is in an upper-middle-lower structural form; the middle structure is an eight-prism which is formed by means of enclosure of eight squares; the upper and lower structures are formed by five squares or four equilateral triangles; the upper structure and the lower structure are symmetrical with the middle structure; an inclinometer is arranged on any surface of the inner wall of the skeleton; bearing diaphragms are respectively arranged on each surface, with round holes, of the skeleton; a foil gauge is pasted on the inner wall of the round surface which is formed after combination of the bearing diaphragms and the skeleton; and a foil gauge wire and an inclinometer wire are led out through a data wire hole by means of a data wire, and then are connected with a data acquisition instrument so as to form a mini three dimensional effective stress box. And at the same time, the invention also provides a test method of the mini three dimensional effective stress box. The mini three dimensional effective stress box and the test method of the same have the advantages of reducing the error caused by rotation of the mini three dimensional effective stress box, reducing the test error caused by unequal range finding, being able to reflect the bearing state of soil because of improvement of accuracy, improving the safety stock during the soil construction process.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering effective stress testing, in particular to a miniature three-dimensional effective stress box and a testing method thereof, which are suitable for measuring the effective stress of saturated soil in geotechnical engineering. Background technique [0002] Based on the basic concept of the effective stress principle proposed in 1923, Taisha clarified the significant difference in the stress-strain relationship between fragmented materials and continuous solid materials. Therefore, the principle of effective stress is an important symbol that distinguishes soil mechanics from solid mechanics and becomes an independent discipline. [0003] For saturated soil, the pores of soil particles are filled with water, and the stress generated by external loads in the soil is transmitted through the contact between particles and pore water. The stress transmitted by the contact between particles causes ...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a miniature three-dimensional effective stress box and its testing method to solve the large error problem caused by the deviation from the preset angle during the use of the three-dimensional effective stress testing device, and to overcome the distance between the pressure-bearing diaphragm and the measurement center. In order to improve the measurement accuracy of the three-dimensional effective stress of soil

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