Test method of integral soil body uniaxial tension device

Abstract

The invention discloses a test method of an integral soil body uniaxial tension device. The test method comprises the following steps: 1, assembling a visual integrated mold; firstly assembling the mold bottom plate, and then assembling the detachable L-shaped plate; 2, preparing a sample, namely filling a soil body sample by adopting a layered compaction method; 3, installing a shaft pulling device, specifically, stretching the die to be half connected with an oil pressure chest expander; 4, disassembling the L-shaped plate; 5, stretching; 6, breaking the sample: further stretching by using an oil pressure chest expander, and breaking the tensile deformation part of the soil body sample after the tensile deformation part reaches the maximum bearing force; meanwhile, separating the slidingstrips located under the fracture part from each other under the driving of the fracture sample above, so that the fracture position of the sample is recorded; and 7, drawing a tensile stress-time curve and a tensile displacement-time curve. A mold used for sample preparation is directly transformed into the movable clamp, integration of the mold and the movable clamp is achieved, demolding is omitted, and the specific fracture position can be observed.

Description

technical field [0001] The invention relates to a soil engineering test device, in particular to a test method for an integral soil uniaxial tension device. Background technique [0002] Soil is the product of rock weathering, and has certain shear strength, compressive strength and tensile strength in terms of mechanical properties. However, in engineering construction, the tensile strength of soil is basically not used by people, so when the predecessors studied the strength of soil, most of them ignored the tensile strength of soil. However, it is an unavoidable problem that soil bears tensile stress sometimes in engineering, and tensile stress often occurs around tall buildings. Therefore, in recent years, the problem of soil tensile strength has become more and more prominent, which has aroused people's wide interest. [0003] The test methods for measuring the tensile strength of soil mainly include: uniaxial tensile test, triaxial tensile test, soil beam bending tes...

AI Technical Summary

Problems solved by technology

However, due to the use of fixtures to fix the sample, it is easy to produce subtle relative sliding, so it is not conducive to the study of soil deformation.

[0007] The traditional uniaxial stretching device is to apply a release agent on the back surface of the mold, and then start the sample preparation. After the sample preparation is completed, the sample is taken out of the mold, and then put into the movable fixture or bonded with the movable fixture and adhesive. Test at both ends of the sample, which will not only cause damage to the sample, but also very cumbersome, the relative sliding phenomenon of fine lines will occur when the sample is fixed by the movable fixture, which will affect the test result

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