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Grouting and chemical electro osmosis combined discrete material pile model testing device and testing method

A model test device and a technology of bulk material piles, applied in the field of model tests, can solve the problems of limited wide application, high cost, and inaccurate measurement results, and achieve the effects of avoiding irrationality, saving resources, and easy operation

Inactive Publication Date: 2014-07-23
HUNAN CITY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional soil deformation measurement method is to bury a series of sensors inside the soil to obtain the displacement of some discrete points, but the sensors are easily affected by the disturbance of the external environment, and the measurement results are often not accurate enough, and at the same time, the continuous deformation inside the soil cannot be given. entire displacement field
Modern digital image technology is only limited to measuring the macroscopic or boundary deformation of the soil, and cannot visualize the internal deformation of the soil.
Although X-ray, γ-ray, computer tomography (CAT scan) and magnetic resonance imaging (MRI) can be used to measure the continuous deformation inside the soil, the high cost limits the wide application of these technologies

Method used

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  • Grouting and chemical electro osmosis combined discrete material pile model testing device and testing method
  • Grouting and chemical electro osmosis combined discrete material pile model testing device and testing method

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Experimental program
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Effect test

Embodiment 1

[0050] Depend on figure 1 , figure 2 It can be seen that a grouting joint chemical electroosmotic dispersion material pile model test device includes a transparent model tank 1, a transparent pressure plate 8 is provided on the top of the transparent model tank 1, a bulk material pile 3 is arranged in the tank, and a bulk material pile 3 is arranged in the tank. The electric geogrid 4 is pre-embedded on the outside of the pile 3, and the top of the electric geogrid 4 is respectively connected to the positive and negative poles of the DC power supply 7 through the wire 6, and the grouting pipe 5 is pre-embedded in the center of the pile body; the bulk material pile 3 is simulated by water-soluble transparent soil, and soil 2 around the pile is simulated by oil-soluble transparent soil; the outer side and upper part of the transparent model tank 1 are provided with a laser source installed on the moving mechanism 13, and the front surface outside the transparent model tank 1, ...

Embodiment 2

[0079] When it is necessary to prepare transparent soil simulating saturated clay, when preparing materials, choose baked quartz sand particles with a particle size of ≤0.074mm;

[0080] When mixing, first put the prepared pore liquid in the transparent model tank 1, and pour the baked quartz sand particles into the transparent model tank 1 slowly, uniformly and dispersedly, continuously stir to discharge the air bubbles during the pouring process, and keep Baked quartz sand particles are always below the surface of the pore liquid;

[0081] When the baked quartz sand particles with a particle size of ≤0.074mm are selected in the preparation, they are consolidated in a consolidation instrument after vacuuming, and the OCR value of the consolidation degree is 0.8-3.

[0082] The OCR value of the degree of consolidation in this embodiment is 0.8;

[0083] The rest are the same as embodiment 1.

Embodiment 3

[0085] When preparing materials, choose baked quartz sand particles 0.25㎜≤particle size<0.5㎜ as 10%, 0.5㎜≤particle size<1.0㎜ as 40%, 1.0㎜≤particle size<1.5㎜ as 35%, 1.5㎜ ≤Particle size≤2.0㎜ is 15%, by weight, the total is 100%, mix them evenly;

[0086] When mixing, the density of the control sample is 40%.

[0087] The rest are the same as embodiment 1.

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Abstract

The invention discloses a grouting and chemical electro osmosis combined discrete material pile model testing device and testing method. The testing device is characterized by comprising a transparent model tank, wherein a transparent pressure plate is arranged at the upper part of the transparent model tank, a discrete material pile is arranged in the transparent model tank, an electric geogrid is pre-buried in the outer side of the discrete material pile, the top part of the electric geogrid is connected with the positive electrode and the negative electrode of a direct current power supply by lead wires respectively, a grouting pipe is pre-buried at the center position inside a pile body, the discrete material pile is simulated by water-soluble transparent soil and soil at the periphery of the pile is simulated by oil-soluble transparent soil, one side and the upper part of the outside of the transparent model tank are provided with a laser source arranged on a moving mechanism, a digital camera arranged on the moving mechanism and used for observing the space of the transparent model tank is arranged on the front view surface and the top view surface of the outside of the transparent model tank, and the digital camera is connected with a processing device by a data line. The testing device is simple and convenient to operate and has strong repeatability, and the prepared transparent soil is similar to the natural soil body in property; the testing method can be used for chemical electro osmosis, formation of the grouting pile body, and visual observation and measurement of grout seepage in the soil at the periphery of the pile.

Description

technical field [0001] The invention relates to a model test of building pile foundations, in particular to a pile model test device and test method for grouting combined with chemical electroosmotic dispersion material, in particular to a visual grouting combined chemical electroosmotic dispersion material Pile model test device and test method. Background technique [0002] Soft soil foundation treatment methods can be mainly divided into two categories: pile displacement enhancement and soil consolidation compression enhancement. In the pile foundation composite foundation, the pile-soil coordinated action to share the upper load is the essential feature of the pile foundation composite foundation to deal with the soft soil foundation. It is of great significance to understand the pile-soil interaction mechanism to master the law of pile and soil strength increase in the process of soft soil foundation treatment. [0003] The patent number is 201110341232.X, and the tit...

Claims

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Application Information

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IPC IPC(8): G01N27/00G01N33/24
Inventor 孔纲强曹兆虎
Owner HUNAN CITY UNIV
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