A uniaxial tensile test method for soil with adjustable height and sliding bar

Abstract

The invention discloses a soil uniaxial tensile test method with adjustable height and sliding rods. It includes step 1, assembling a height-adjustable mold; specifically, step 11, assembling the fixed end of the mold, the stretching end of the mold and several sliding rods. Long strip; step 12, assemble two L bending plates; step 13, adjust the height of the mold: according to the height of the sample to be simulated, determine whether the plywood needs to be raised and the height of the rise; step 2, prepare the sample; step 3, the height Adjustable mold and bottom plate installation; step 4, assembling the uniaxial tension device; step 5, stretching; step 6, specimen fracture; step 7, drawing curves; step 8, uniaxial tension when performing different specimen parameters test. The invention can directly use the mold for sample preparation to carry out the test, and realize the tensile test of samples of different heights through the lifting and lowering of the splint to cooperate with the inner wall plate, avoiding the test of a single height sample, and exploring the influence of the size change of the sample on the tensile test. And it can reduce the friction while knowing the specific location of the crack.

Description

technical field [0001] The invention relates to a soil engineering test device, in particular to a soil uniaxial tensile test method with adjustable height and a sliding bar. 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, soi...

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Problems solved by technology

[0004] In the new test device developed by Che Ruijie et al., the guide rail is placed between the movable fixture and the test chassis, and the stretching of the sample is ensured by the sliding of the guide rail. This has the effect of reducing friction to a certain extent, but there will still be friction It has an impact on the experiment, because the guide rail acts as a limit movement to the movable fixture, so when eccentric stretching occurs, the friction on the edge of the guide rail will become greater

[0005] The strain-controlled horizontal uniaxial tensile instrument developed by Dang Jinqian et al. has a convenient test method and clear test results. However, since the handwheel is manually controlled, the rotation speed is not fixed, and it cannot solve the problem of re-tensioning the sample. Whether there will be eccentric stretching during stretching

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