Test device and test method for horizontal stress of compacted soil

Abstract

The invention provides a test device and a test method for a horizontal stress of compacted soil. The device comprises a limiting box, a sample barrel, a pressing device, and a load sensor. The limiting box is a rigid, rectangular box made of a steel plate with an open upper part. The sample barrel and a protective tube are hollow cuboid wherein the interior is rounded and the outside is square. The sample barrel and a half-pad are in contact with the bottom plate of the limiting box through a ball chute structure, and the two sides of the moving direction are respectively in contact with a sample barrel limit bolt and a load sensor. A half-pad and a half-spacer for reducing a hoop effect are arranged at both ends of the soil sample. The half-pad and the half-spacer are composed of two semicircular metal plates with the same radius. A soil sample layer preparation height is precisely controlled by the half-spacer and a limit block. The contact point of the load sensor is located at thecenter of the outer wall of a half-barrel. The total horizontal pressure of the compacted soil sample taken by the inner wall of the sample barrel is measured by the load sensor, and the horizontal stress is calculated. The error of the horizontal stress value of the compacted soil measured by the device is small, which can provide a more reliable and accurate stress basis for the design, construction and maintenance of embankment filling.

Description

technical field [0001] The invention relates to a testing device and a testing method for the horizontal stress of compacted soil in geotechnical engineering. Background technique [0002] In recent years, the construction of my country's high-speed railway is extending to the hills and mountainous areas in the central and western regions. In order to make full use of the filler resources in the mountainous areas, it is inevitable to fill a certain amount of high embankments. However, the survey shows that the high fill embankment often has the problems of settlement deformation of embankment and slope instability due to the substantial increase of fill load. In order to solve the problems of settlement deformation and slope instability of the fill, it is necessary to measure the stress of the fill in the embankment in the compacted state during the design, construction and maintenance of the embankment fill. [0003] The stress test method of the existing subgrade filling ...

AI Technical Summary

Problems solved by technology

The existing problems are: there are differences in physical and mechanical properties between the earth pressure cell and the surrounding soil, and the earth pressure cell will inevitably cause stress concentration and stress redistribution in the surrounding soil at a short distance during the embedding process, which changes the soil's physical and mechanical properties. The initial stress field, resulting in a matching error, resultin

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