Impact rolling test device and method for simulating coarse-grained soil foundation in original stress state

A technology of impact rolling and stress state, which is applied in the direction of measuring devices, soil protection, and mechanical devices, etc., can solve the problems of low stress level, low stress state, and low density index of coarse-grained soil in soil samples, and achieve test results. The effect of process safety, precise control and small fluctuation of horizontal movement speed

Active Publication Date: 2022-07-15
NANJING HYDRAULIC RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in the existing impact rolling model test literature, the model test object is mainly fine-grained soil, and the soil samples for the model test are mainly prepared by the rain method, and the stress level of the soil sample is low, which is far lower than the stress state of the actual foundation.
The compactness index of coarse-grained soil after model test reinforcement is low, which cannot reflect the actual situation on site
At the same time, in the existing reported impact rolling model device, the steel wire rope is used to pull the impact wheel to move horizontally along the fixed track. The movement process of the impact wheel is an acceleration process under the action of the wire rope traction force, and its horizontal movement speed gradually increases with the movement process. , which is inconsistent with the actual

Method used

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  • Impact rolling test device and method for simulating coarse-grained soil foundation in original stress state
  • Impact rolling test device and method for simulating coarse-grained soil foundation in original stress state
  • Impact rolling test device and method for simulating coarse-grained soil foundation in original stress state

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] combine Figure 1-Figure 5 , an impact rolling test device for simulating the original stress state of coarse-grained soil foundation, including

[0077] The sample preparation system includes a model box 1, a lifting module 3 and a sand bucket 5. The lifting module 3 is connected to the sand bucket 5. The sand bucket 5 is loaded with dyed coarse-grained soil samples 16. The granular soil samples 16 are laid in layers in the model box 1, and multiple arrays of sensors 22 are arranged in the model box 1. The sensors 22 are used to monitor the coarse-grained soil samples at different positions and depths in the model box 1 during the impact rolling process. Dynamic earth pressure, acceleration and impact contact stress of sample 16.

[0078] The vertical pressure loading system includes an air compressor, a pneumatic element 11 and a loading assembly. The exhaust port of the air compressor is connected to the pneumatic element 11, and the output end of the pneumatic elem...

Embodiment 2

[0097] Based on Example 1, as Figure 10 As shown, an impact rolling test device for simulating a coarse-grained soil foundation in an original stress state also includes a processing system. The processing system includes a terminal processing module 26, a dynamic signal test and analysis module 27 and an image acquisition module 28. The dynamic signal test and analysis module 27 It is used to collect the data of the sensor 22 and feed it back to the terminal processing module 26 . The image collection module 28 is used to collect the speckle change pictures of the particles during the reinforcement process of the coarse-grained soil sample 16 in the model box 1 and feed it back to the terminal processing module 26 . The terminal processing module 26 is used to analyze and display the results.

[0098] Specifically, during the test, the high-speed camera of the image acquisition module 28 is used to face the visible window 23 of the model box 1, and the moving pictures of the...

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Abstract

The invention relates to an impact rolling test device for simulating a coarse-grained soil foundation in an original stress state, the impact rolling test device comprises a sample preparation system, a vertical pressure loading system and an impact rolling system, a coarse-grained soil sample is prepared through the sample preparation system, and the initial relative compactness of the coarse-grained soil sample is controlled by adjusting the shakeout height; vertical stress is applied to the coarse-grained soil sample through the vertical pressure loading system, so that solidification of the coarse-grained soil sample is realized, and the original stress state of the coarse-grained soil sample is simulated; after consolidation is completed, an impact rolling load is applied to the coarse-grained soil sample through an impact rolling system, and the actual impact rolling process is simulated by adjusting the mass of an impact wheel and the horizontal moving speed of the impact wheel on the surface of the coarse-grained soil sample. The device can be used for simulating the impact rolling reinforcement process of the coarse-grained soil foundation in the actual stress state indoors, and provides reliable technical support for evaluating the effect of reinforcing the coarse-grained soil foundation through the impact rolling technology and exploring the coarse-grained soil compaction mechanism.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering foundation treatment, in particular to an impact rolling test device and method for simulating a coarse-grained soil foundation in an original stress state. Background technique [0002] Impact rolling is a dynamic reinforcement method for foundations, which combines impact and rolling, and uses the impact force and self-weight pressure generated by the change of the center of gravity of the non-circular impact wheel during the movement to compact the soil. The advanced roller compaction isostatic compaction technology, the reinforcement depth is deeper, and the compaction efficiency is increased by more than 3 times. In recent years, impact rolling technology has been gradually applied to the foundation reinforcement of water conservancy engineering, road engineering, airport engineering and other industries. [0003] At present, some useful explorations have been carried out on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/00G01N1/28E02D3/02E02D3/026
CPCG01N19/00G01N1/28E02D3/02E02D3/026E02D3/0265
Inventor 占鑫杰高长胜朱群峰钱彬许小龙杨守华李文炜徐锴吴志强赵士文李小梅韩孝峰
Owner NANJING HYDRAULIC RES INST
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