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Grouting gravel cemented soil mixing combined pile model testing device and method

A model test device and cement-soil mixing technology, which is applied in the field of model tests, can solve the problems that the sensor is easily disturbed by the external environment, the soil cannot be given, and the cost is expensive.

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 gravel cemented soil mixing combined pile model testing device and method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Embodiment 1: (transparent solid material is perfluorocyclic polymer)

[0070] Depend on figure 1 It can be seen that a slurry-solid gravel-cement-soil mixing pile model test device includes a transparent model tank 1, and the transparent model tank 1 is provided with a slurry-solid gravel-cement-soil mixing pile and transparent soil for simulating the surrounding soil 2; The top of the transparent model tank 1 is provided with a drilling mechanism that is installed on the support 12 and includes a drilling machine 7, a drill rod 5, and a drill bit 6; A digital camera 10 that can observe the space of the transparent model tank 1 is provided, and the digital camera 10 is connected with the processing device 11 through a data line; the laser light irradiates the transparent model tank 1 to form a laser section of the vertical or horizontal plane of the transparent model tank 1, and the digital camera 10 Record the changes in the speckle field of the soil around the pile ...

Embodiment 2

[0099] Embodiment 2: (transparent solid material is perfluorocyclic polymer)

[0100] In the process (1), select perfluorocyclic polymer particles 0.25㎜≤particle size<0.5㎜ as 10%, 0.5㎜≤particle size<1.0㎜ as 30%, and 1.0㎜≤particle size<1.5㎜ as 30% ﹪, 1.5㎜≤particle size≤2.0㎜ is 30%, the total is 100% by weight, and they are mixed evenly; the pore liquid is sodium chloride solution, and its concentration is 5%;

[0101] When mixing, first put the prepared pore liquid in the transparent model tank 1, and slowly, uniformly and dispersedly pour the perfluorocyclic polymer particles into the transparent model tank 1, and continuously stir to discharge the air bubbles during the pouring process. And keep the perfluorocyclic polymer particles always below the liquid level of the pore liquid;

[0102] The physical characteristics of the transparent soil made in this embodiment are: density 1.65g / ㎝ 3 , severe 17kN / m 3 , compactness 40%; mechanical properties: internal friction angle 3...

Embodiment 3

[0104] Embodiment 3: (transparent solid material is perfluorocyclic polymer)

[0105] In the process ⑴, select perfluorocyclic polymer particles 0.25㎜≤particle size<0.5㎜ as 10%, 0.5㎜≤particle size<1.0㎜ as 40%, and 1.0㎜≤particle size<1.5㎜ as 35% ﹪, 1.5㎜≤particle size≤2.0㎜ is 15%, the total is 100% by weight, and it is mixed evenly; the pore liquid is an alcohol solution, and its concentration is 15%;

[0106] When mixing, the density of the control sample is 40%.

[0107] The physical properties of the transparent soil made in this example are: density 1.83 g / ㎝ 3 , weight 17.5kN / m 3 , compactness 40%; mechanical properties: internal friction angle 31°, elastic modulus 15MPa, Poisson's ratio 0.32.

[0108] The rest are the same as embodiment 1.

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Abstract

The invention discloses a visual grouting gravel cemented soil mixing combined pile model testing device and method. The device is characterized by comprising a transparent model tank, wherein a grouting gravel cemented soil mixing combined pile and transparent soil for simulating pile periphery soil are arranged in the transparent model tank; a drilling mechanism which is arranged on a bracket and comprises a drilling machine, a drill rod and a drill bit is arranged above the transparent model tank; a laser source is arranged on one side outside the transparent model tank; a digital camera capable of observing the space in the transparent model tank is arranged on the front and overhead view surface outsides the transparent model tank; the digital camera is connected with a processing device through a data line. The testing device is simple and convenient to operate and high in repeatability; the similarity between the prepared transparent soil and natural soil is high in soil properties; the testing method can visually observe and measure a pile-soil interaction mechanism of the grouting gravel cemented soil mixing combined pile under the conditions of different pile periphery soil characteristics, drill bit rotating radiuses, combined pile diameters and pile lengths and can be used for exploring and guiding the design and the construction of the cement soil mixing pile.

Description

technical field [0001] The present invention relates to a model test of a construction pile foundation, in particular to a model test device and test method for a slurry-solid gravel cement-soil mixing pile model, in particular to a visualized slurry-solid gravel cement-soil mixing pile model Test device and test method. Background technique [0002] The nature of the pile-soil contact surface directly affects the performance of pile side friction, and the size of pile side friction is also a decisive factor that directly affects the bearing capacity of foundation piles in soft soil foundations. Cement-soil mixing piles are widely used in engineering because of their technical advantages such as good pile-soil contact surface and convenient construction. However, the relatively low overall bearing capacity of cement-soil mixing piles affects its application in many aspects. Therefore, how to improve the overall bearing capacity of cement-soil mixing piles has become one of ...

Claims

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Application Information

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IPC IPC(8): G01N33/38G01B11/00G01B11/08
CPCG01N33/383
Inventor 孔纲强曹兆虎
Owner HUNAN CITY UNIV
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