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Energy pile-soil load and temperature transmission mechanism model test device and test method

A technology of mechanism model and test device, applied in the field of model test, can solve the problems of low scalability and high cost

Inactive Publication Date: 2014-07-16
HUNAN CITY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can truly measure the law of energy transfer between the pile and soil under the influence of temperature, and the value of the bearing capacity of the pile foundation under the influence of temperature; They are all point-type and buried-type, and the field test is expensive; due to the difference in geological conditions, the results obtained from the field test have little generalizability

Method used

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  • Energy pile-soil load and temperature transmission mechanism model test device and test method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0070] Depend on figure 1 , figure 2 It can be seen that an energy pile-soil load and temperature transfer mechanism model test device includes a transparent model tank 1, and the transparent model tank 1 is provided with transparent energy embedded in the transparent soil of the simulated pile surrounding soil 2 and pile tip soil 3. Pile 9, the transparent energy pile 9 is hollow, the bottom of the pile is closed, and a heat transfer tube 10 is arranged inside the transparent energy pile 9, and the heat transfer tube 10 is connected with the cold and heat cycle mechanism; the side of the transparent energy pile 9 is buried with a measurement The fiber grating 14 for the axial force deformation and temperature change of the transparent energy pile 9 pile body, the earth pressure cell 15 for measuring the stress at the bottom of the transparent energy pile 9 is buried at the bottom of the pile, and...

Embodiment 2

[0098] Embodiment 2: (transparent solid material is perfluorocyclic polymer)

[0099] In the process (2), 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%;

[0100] 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;

[0101] 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

[0103] Embodiment 3: (transparent solid material is perfluorocyclic polymer)

[0104] In the process (2), select perfluorocyclic polymer particles with 0.25㎜≤particle size<0.5㎜ as 10%, 0.5㎜≤particle size<1.0mm as 40%, and 1.0㎜≤particle size<1.5mm 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%;

[0105] When mixing, the density of the control sample is 40%.

[0106] 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.

[0107] The rest are the same as embodiment 1.

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Abstract

The invention discloses a visual energy pile-soil load and temperature transmission mechanism model test device and test method. The device is characterized by comprising a transparent model groove, a transparent energy pile which is embedded in transparent soil of simulation pile peripheral soil and pile end soil is arranged in the groove, the transparent energy pile is hollow, the pile bottom is closed, a heat transfer pipe is arranged in the pile, the heat transfer pipe is in linkage with a cold and hot circulating mechanism, a fiber bragg grating which is used for measuring the axial force deformation and temperature changes of a pile body of the transparent energy pile is embedded on the side of the transparent energy pile, a soil pressure box used for measuring the pile bottom stress of the transparent energy pile is embedded in the pile bottom, a laser source arranged on a movable mechanism is arranged on one side outside the transparent model groove, digital cameras for observing the space of the transparent model groove are arranged on the front visual face and the lookdown face outside the transparent model groove, and the digital cameras are in linkage with a processing device through data lines. The test device is easy and convenient to operate and strong in repeatability. The similarity of the soil properties of the prepared transparent soil and the natural soil is good, and the test method can be used for exploring the energy pile-soil heat transmission mechanism and a load transmission mechanism.

Description

technical field [0001] The invention relates to a model test of building pile foundations and ground source heat pumps, in particular to an energy pile-soil load and temperature transfer mechanism model test device and test method, in particular to a visualized energy pile-soil load, Temperature transfer mechanism model test device and test method. Background technique [0002] Ground source heat pump technology uses the relatively stable temperature characteristics of underground soil, surface water, and groundwater to transfer heat from low-level heat sources to places that need heating or heating in winter by consuming a small amount of electric energy, and heat indoors in summer. The waste heat is transferred to the low-level heat source to achieve the purpose of cooling or cooling. Directly burying the heat exchange tube in the concrete pile foundation of the building is called an energy pile, which can effectively solve the problems of the construction steps of the sp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M99/00E02D33/00
Inventor 孔纲强
Owner HUNAN CITY UNIV
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