Device and test method for testing three-dimensional stress state inside soil

Abstract

The invention provides an apparatus for testing a three-dimensional stress state inside soil. Six routine soil pressure boxes of the apparatus are respectively arranged at six side surfaces, apart from an upper surface and a lower surface which are parallel to each other, of an octahedral pedestal, gaps between the routine soil pressure boxes and the octahedral pedestal are filled with expansion water seal rubber rings, a soil pressure box data lead is connected with a soil pressure box element measuring reading device, and the gap between the soil pressure box data lead and the octahedral pedestal is filled with a polyurethane foam filler for waterproof sealing. The invention simultaneously provides a test method using the apparatus. The apparatus and method have the following advantages: the apparatus is visual in test, clear in calculation method, reasonable in structure, simple to operate and low in cost, errors caused by a conventional stress calculation mode are improved, if it is assumed that precision of a conventional soil pressure box is rho, the test precision of three kind of main stress through calculation is 1.0 rho, the test precision of three kind of shearing stress is 1.22 rho, and the average test precision is 1.11 rho. Improvement of precision can accurately reflect stress state of the soil and improves emergency capacity of engineering.

Description

technical field [0001] The invention belongs to the field of stress testing, in particular to a device and testing method for testing the three-dimensional stress state inside the soil. It can be used to monitor the conventional stress state inside the soil. technical background [0002] Soil is a multiphase porous medium, which is affected by factors such as stress level, stress history, and stress path, so it is difficult to determine the stress state. The stress state is the premise of studying the deformation and strength of the soil. Obtaining the stress state in the soil is of great value for ensuring the safety of the project and for the reinforcement and maintenance of the project. Especially in the construction of civil engineering, water conservancy engineering, traffic engineering, mining engineering and other facilities, accurate and intuitive acquisition of the stress state of the soil is the need for safety analysis, scientific design and construction of the p...

AI Technical Summary

Problems solved by technology

[0004] At present, there are problems in the field of stress testing in geotechnical engineering: the compression deformation of soil can easily lead to changes in the buried position of conventional earth pressure cells, and the earth pressure cells are buried in the direction of the artificially assumed maximum principal stress, and the measured maximum principal stress is not practical. sex

The disadvantage brought by the above problems is that there is a huge error between the test result and the actual value, and it cannot be used to determine the stress state of a point in the soil

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