Soil mass total stress component sensing ball and using method thereof

Abstract

The invention provides a soil mass total stress component sensing ball and a using method thereof. The soil mass total stress component sensing ball comprises a regular icosahedron framework, a spherical shell, and a weight adjusting mechanism for adjusting the overall weight of a sensing ball. Sixteen distributed optical fibers are arranged on the face, away from a conical force transmission cap,of each first steel sheet and used for testing stress of the conical force transmission cap, and the two distributed optical fibers are used for conducting temperature correction on deformation of the distributed optical fibers. According to the soil mass total stress component sensing ball and the using method thereof, six effective stress components in the soil mass are obtained through wavelength change values of light in the sixteen distributed optical fibers and temperature correction based on a conversion formula, more data are collected, and the measurement precision is high. The placement direction does not need to be determined in advance and the soil mass total stress component sensing ball and the using method thereof are also suitable for soil bodies with complex stress statechanges.

Description

technical field [0001] The invention relates to the technical field of soil stress testing, in particular to a soil full stress component sensing ball and a use method thereof. Background technique [0002] In engineering activities such as housing construction, underground space development, and geological disaster prevention and control, the internal stress change process of the soil is very complicated. There are continuous changes in the magnitude of the principal stress and continuous changes in the direction of the principal stress. The stress at any two points in space The status is also different. In addition, factors such as rainfall, leaking water pipes, adjacent traffic, waves, etc. can all cause constant changes in stress. Under unfavorable conditions, the stress in the soil will develop in the direction of destruction, causing immeasurable losses to engineering construction. Therefore, it is an important part of urban and rural construction and disaster preven...

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Problems solved by technology

[0006] The above two patents are based on the polyhedral arrangement of ordinary earth pressure cells to test the multi-directional stress state inside the soil, but because the number of earth pressure cells arranged is small and the collected data is limited, the polyhedral arrangement has a great impact on the in-situ stress of the soil. Large disturbances lead to large test errors

Moreover, the earth pressure cell group arranged in polyhedron needs to determine the installation direction in advance to accurately reflect the soil stress, which is difficult to apply when the stress state changes complex (especially the ubiquitous situation involving the rotation of the main direction of stress)

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