Ballast direct shear device
A technology of direct shearing and ballasting, which is applied in the field of rail transit, and can solve problems such as the inability to reflect the shearing performance of the ballast group and the inability to reflect the direct shearing performance of the ballast group
Active Publication Date: 2019-01-15
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology
The traditional ballast direct shear test cannot reflect the direct shear performance of the ballast group under the actual vertical vibration load; nor can it reflect the shear performance of the ballast group under the condition of cyclic shear or variable force shear
Method used
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Embodiment
[0027] An embodiment of the present invention provides a ballast direct shearing device for shearing granular aggregates. The ballast direct shearing device includes an upper shearing box 101 , a lower shearing box 102 , a main control chip 103 , a first driving device 104 , a vibrator 105 and a second driving device 106 . The upper shear box 101 and the lower shear box 102 are arranged up and down oppositely to form a shear seam to form a shear box device. In this embodiment, the volume of the lower shear box 102 is greater than that of the upper shear box 101, thereby ensuring that the The size of the shear plane remains unchanged during the shearing process. When the cutting operation is in progress, the material is located in the shear box device. In addition, a loading plate 117 is installed between the upper shear box 101 and the vibrator 105, the force output by the first driving device 104 and the vibrator 105 does not directly act on the upper shear box 101, but acts...
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The invention provides a ballast direct shear device and relates to the field of rail transit. Since the top of an upper shearing box is provided with a vibration exciter, a first driving device is connected with the vibration exciter, and when the first driving device drives the upper shearing box to move in a vertical direction to shear particle aggregates, the vibration exciter can be driven toapply vertical vibration of different amplitudes and frequencies to the upper shearing box; since a second driving device is a variable frequency driving device, the second driving device is connected with a lower shearing box through a connecting block, and the second driving device can apply different speeds or different accelerations to the lower shearing box to drive the lower shearing box tohorizontally move. Through the above two coupling actions, the direct shear performance test of a ballast group can be carried out by applying a vibration load in the vertical direction; a cyclic load or a variable frequency load is applied in a horizontal direction to determine the particle change size, the law of force transmission and the law of deformation after different external loads act on the ballast group.
Description
technical field [0001] The invention relates to the field of rail transportation, in particular to a ballast direct shearing device. Background technique [0002] Ballast is coarse gravel or crushed stone used to pave road or railway subgrade or track bed, mainly for railway bed or track bed. Ballast is the crushed stone used to support track sleepers in the railway transportation system, and it is a common track bed structure. Before the track is laid, a layer of crushed stone will be laid on the subgrade and then compacted before the sleepers and track are laid. The use of ballast can make it easy to drain water and adjust the position of the rails. At the same time, because the ballast disperses the weight of the train and the rails on the roadbed, it can reduce the vibration and noise caused by the passing of the train, so that passengers can ride comfortably. Increase. [0003] In the prior art, the direct shear test of the ballast is carried out using a direct shear...
Claims
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IPC IPC(8): G01N3/00G01N3/02G01N3/32
CPCG01N3/00G01N3/02G01N3/32G01N2203/0005G01N2203/0025G01N2203/0284G01N2203/0676
Inventor 肖杰灵王平刘鉴兴刘淦中刘浩李敏一李少铮
Owner SOUTHWEST JIAOTONG UNIV