Self-balancing type multi-loading-path one-way shearing box for pile-soil test

A self-balancing, soil test technology, applied in the direction of testing material strength by applying stable bending force, testing material strength by applying stable tension/compression, measuring devices, etc., can solve the problem of not being able to obtain experimental results, affecting stress diffusion and Attenuation and other issues, to achieve the effect of clear concept, reduced model size, and simple assembly

Active Publication Date: 2020-05-12
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the static (pseudo-static) test, the interlayer shear box cannot be used, and the angle steel box is generally used, that is, the boundary condition of the soil is limited to rigidity, which is inco

Method used

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  • Self-balancing type multi-loading-path one-way shearing box for pile-soil test
  • Self-balancing type multi-loading-path one-way shearing box for pile-soil test
  • Self-balancing type multi-loading-path one-way shearing box for pile-soil test

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The purpose of embodiment 1 is to apply push or press down load to pile or soil body, such as Figure 1-Figure 4 shown. A self-balancing multi-loading path one-way shear box for pile-soil tests is composed of a reaction force frame, loading equipment, an angle steel box body 3 and a one-way shear device.

[0027] In this example, the reaction frame is composed of a reaction frame screw 1 and a channel steel reaction beam 2 . The counter force frame screw rod 1 passes through the hole reserved in the angle steel box body 3, and is connected with it with a nut. Two 14a-type channel steel back-to-back form the channel steel reaction beam, and bolts pass through the reserved holes to connect the two channel steels. A gap is reserved between the channel steels, the size of which is equal to the diameter of the reaction frame screw 1, and the reaction frame is formed by connecting the reaction frame screw 1 with bolts to provide reaction support for the load.

[0028] In t...

Embodiment 2

[0033] The purpose of embodiment 2 is to apply a tensile load to the pile, such as Figure 5 shown.

[0034] In this example, the angle steel box 2 and the one-way shearing device are the same as in Embodiment 1, the actuator 4 in the loading device is replaced by a pulley 12, and the connection mode with the channel steel reaction frame remains unchanged. The joint 15 passes through the pile 16 and is connected with the wire rope 14 , and the other end of the wire rope passes through the pulley 12 and is connected with the counterweight 17 , so that the pile 16 is loaded by force transmission. The tension sensor 13 is passed through the middle of the steel wire rope located at the pulley 12 and the joint 15, so that the influence of the pulley on the force transmission can be ignored, and the pulling force suffered by the stake 16 can be obtained directly. By adjusting the height of the channel steel reaction frame, the angle of the uplift load can be changed to meet differe...

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Abstract

The invention discloses a self-balancing type multi-loading-path one-way shearing box for a pile-soil test and belongs to the technical field of geotechnical engineering tests. A loading part of the device can change positions to apply static or quasi-static loads such as pulling, pressing and pushing under different loading paths, soil stress diffusion and attenuation can be simulated through a semi-shearing device, and the influence of boundary conditions is reduced so as to achieve the purpose of reducing the size of the model. The device is composed of a reaction frame, a loading device, an angle steel model box and the semi-shearing device. The model box is used for bearing piles and soil and is a main place for pile-soil interaction. The one-way shearing device realizes the one-way shearing of a soil body, unifies experimental boundary conditions and actual boundary conditions, reduces the size of the model while improving the test reliability, and reduces financial and materialresource consumption. The reaction frame and the loading device are used for applying loads, multiple combination modes are achieved, the loading position and angle can be adjusted, and the multi-pathloading can be achieved.

Description

technical field [0001] The invention relates to the field of civil engineering model tests, and designs a self-balancing one-way shear box that can approximate real boundary conditions and can realize multi-path loading in pile-soil interaction tests. Background technique [0002] Pile-soil interaction test is an important field of civil engineering research. However, due to the large size of the test object, loading is difficult, manpower and material resources are consumed, and in-situ experiments are difficult to achieve most of the time. Therefore, small model tests Be the first choice for obtaining relevant data. [0003] In the pile-soil interaction test, a load-bearing container is generally designed, and various loads are applied after the test object and soil are loaded into the container for testing. In terms of load frequency, it is generally divided into two types: dynamic and static (including quasi-static) tests. The typical dynamic test is the pile-soil inter...

Claims

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Application Information

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IPC IPC(8): G01N3/08G01N3/20G01N3/04
CPCG01N3/08G01N3/20G01N3/04G01N2203/0003G01N2203/0017G01N2203/0019G01N2203/0023G01N2203/04
Inventor 许成顺刘开源张小玲杜修力薛钧元
Owner BEIJING UNIV OF TECH
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