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Vibration table-based sample preparation device and vibration table-based sample preparation method for large-scale triaxial test of coarse grained soil

A triaxial test and shaking table technology, applied in the field of soil dynamics laboratory test, can solve the problems of limited excitation force of the surface vibrator, inability to monitor the height of each layer of samples in real time, and inability to control the density of samples well, etc. Achieve good compactness and reduce breakage

Active Publication Date: 2015-05-27
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Some scholars place a vibrator on the surface of the sample for layered vibration to control the breakage rate, but the surface vibrator has limited excitation force, and cannot monitor the height of each layer of the sample in real time, and cannot well control the compactness of the sample.

Method used

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  • Vibration table-based sample preparation device and vibration table-based sample preparation method for large-scale triaxial test of coarse grained soil
  • Vibration table-based sample preparation device and vibration table-based sample preparation method for large-scale triaxial test of coarse grained soil
  • Vibration table-based sample preparation device and vibration table-based sample preparation method for large-scale triaxial test of coarse grained soil

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Embodiment Construction

[0023] Such as Figure 1~6 As shown, the entire improved vibrating table is fixed on the concrete foundation 1 with expansion bolts to avoid vibrating tiles during the vibration of the vibrating table, resulting in uneven bottom of the vibrating table and eccentric force, which affects the sample preparation effect. The lower part 2 of the vibrating table is equipped with a special frequency modulation motor, which can control the vibration frequency and amplitude with low noise. Four vibrating springs 3 lower ends are fixedly installed on the bottom top surface of the vibrating table, and the vibrating table top 4 is fixedly installed on the four vibrating springs 3 upper ends; the vibrating table top 5 has been coated with an antirust oil layer and protected with a transparent plastic. The center of the vibrating table is fixed as Figure 4 The sample chassis 6 is shown for constraining the sample base 7 . There are four symmetrically distributed chassis grooves 6a on the ...

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Abstract

The invention discloses a vibration table-based sample preparation device and a vibration table-based sample preparation method for a large-scale triaxial test of coarse grained soil. An improved table top of a vibration table is adopted, so that a sample base and a protective arm can be fixed and conveniently disassembled and lifted; based on the vibration effect of the vibration table, samples are compacted by vibration layer by layer, so that the grain breakage rate of the coarse grained soil samples can be reduced in the sample preparation process; the heights of all the layers of samples can be monitored in real time by a vernier caliper capable of freely moving along the vertical direction, so that the density of the samples can be better controlled; the prepared samples are placed on a GDS large dynamic triaxial test apparatus by a small-sized crane; after the device and the method are used, low breakage rate, easy control and high accuracy are realized in the large-scale triaxial test process on the whole; the device and the method have great promotion and popularization functions for large-scale triaxial static and dynamic tests related to the coarse grained soil in the future.

Description

technical field [0001] The invention belongs to the technical field of soil dynamics laboratory tests, and relates to a sample preparation device and method for a large-scale static and dynamic triaxial test of coarse-grained soil, in particular to a sample preparation device and method for a large-scale triaxial test of coarse-grained soil based on a shaking table. method. Background technique [0002] With the increasing demand for transportation in economic development, the construction of transportation facilities in our country has entered a stage of rapid development. Expressway and railway subgrades are generally composed of coarse-grained soil. Under the action of high-speed, heavy-duty and large-flow traffic cyclic loads, the subgrade particles often slide and squeeze and break, and the macroscopically shows excessive subgrade settlement and subgrade stiffness. The weakening causes the stress in the foundation to increase significantly, and even causes the road to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28
Inventor 曹志刚陈靖宇谷川王鹏
Owner ZHEJIANG UNIV
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