Multi-layer linkage pull-out tester suitable for testing seismic deformation of reinforced soil
A technology of pull-out test and reinforced soil, applied in the direction of applying stable tension/compression to test the strength of materials, instruments, measuring devices, etc., can solve the problem that the mechanism of action of geogrid, reinforcement effect and anti-deformation ability have not been effectively obtained Problems such as verification and little accumulation of test data, etc., to achieve the effects of reducing boundary effects, simple and effective installation, convenient operation and scientific and effective results
Pending Publication Date: 2022-03-25
TAIYUAN UNIV OF TECH
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Problems solved by technology
However, under the action of earthquake force in the high seismic intensity area, the mechanism of action, reinforcement effect and anti-deformation ability of geogrid have not been effectively confirmed, and the relevant test data are rarely accumulated, which cannot meet the requirements of the current reinforced soil field. Rapid development and need
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[0043] Combined with the interface linkage drawing experiment of the three-layer grid under horizontal vibration, the specific operation steps of this embodiment are described:
[0044] 1. Calculate the amount of ballast particle filler required according to the relative compactness and volume weight requirements, put the filler into the model box 5, and compact it in layers according to the required density and sample quality. The compaction height of each layer is 200mm. After compaction , the ballast level is slightly higher than the side edge of the model box 5.
[0045] 2. The selected geogrid 4 should be uniformly cut from the length and width directions, the length is 900mm, and the strain gauge 15 is pasted on the surface of the geogrid 4, and the geogrid 4 is placed flat on the ballast particles. It is required to be flat and wrinkle-free. Parallel to the sides and centered. One end of the geogrid 4 sample is drawn out of the box from the outlet of the front baffle, ...
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The invention discloses a multi-layer linkage pull-out tester suitable for testing earthquake deformation of reinforced soil, and belongs to the technical field of roadbed performance testing. The pull-out tester comprises a vibration table, a model box, a counter-force frame, a horizontal loading system, a tension sensor, a displacement sensor and a PIV monitoring system; the multi-layer linkage pull-out tester can effectively restore the stress deformation physical process of geogrid-railway ballast under the action of earthquake load, and capture mechanical characteristics such as macroscopic pull-out force, rib strain and particle flow in the process, so that design parameters such as vertical spacing of reinforcement are optimized in related test analysis; the benefit maximization of the reinforcement effect of the reinforcement material is realized, and the multi-layer drawing test of the geogrid can be realized.
Description
technical field [0001] The invention belongs to the technical field of roadbed performance testing, and relates to equipment for testing the physical and mechanical characteristics of the reinforcement-soil interface in roadbed engineering under the action of earthquake loads, in particular to a multi-level linkage pullout tester suitable for testing the seismic deformation of reinforcement-soil. Background technique [0002] Ballasted track is the most widely used structural form in railway track structure at present. It has the advantages of good elasticity and good noise reduction. It is often used in deep cuttings, soft soil subgrades and areas with frequent seismic activities, but its track smoothness is weaker than that of Ballastless track is susceptible to car body vibration and external disasters. In recent years, many large earthquakes of magnitude Ⅶ or above have occurred in many areas of my country, especially in the complex mountainous areas of the west. Strong ...
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Login to View More IPC IPC(8): G01N3/08G01N3/02
CPCG01N3/08G01N3/02
Inventor 苗晨曦高孟亮朱孝振庞冬冬任景瑞陈小艺
Owner TAIYUAN UNIV OF TECH