Pile soil sliding friction testing method

A sliding friction, pile-soil technology, applied in measuring devices, instruments, mechanical devices, etc., can solve problems such as the inability to simulate the change of friction force, the inability to reflect the pile-soil friction, and the change of the shear area.

Inactive Publication Date: 2015-02-11
SUN YAT SEN UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

However, at home and abroad, there is no special test instrument for testing the static friction and sliding friction between piles and soil, and they are all carried out in direct shear instrument, ring shear instrument or specially designed model test.
Among them, the ring shear instrument is more expensive, the model test is time-consuming and laborious, and the cost is high, while the direct shear instrument is the most simple and direct, and the test cost is low. Therefore, the most widely used test instrument is the direct shear instrume

Method used

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  • Pile soil sliding friction testing method
  • Pile soil sliding friction testing method
  • Pile soil sliding friction testing method

Examples

Experimental program
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Embodiment Construction

[0008] (1) Install the sample, the pile body material sample is made into 100mm×65mm, the diameter of the soil sample is 61.8mm, and the height is 2mm. Pile material samples and soil samples were saturated before testing.

[0009] (2) Apply vertical load, the test is carried out under different vertical loads, the test load is applied according to 100kPa, 200kPa, 300kPa, 400kPa, and the counterweight is adjusted during the test to ensure that the sample bears the vertical pressure.

[0010] (3) Apply horizontal shear stress to make friction between the soil sample and the pile material. From static to sliding, the limit static friction force f is determined by the peak value measured by the dial indicator in the measuring force ring su :

[0011] f su = cR (1)

[0012] In the formula, R is the reading of the dial gauge of the measuring force ring (0.01mm), and c is the constant coefficient of the measuring force ring (kPa / 0.01mm). When sliding friction (the spring is not w...

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Abstract

The invention relates to a testing method for simulating the static friction and the sliding friction of pile soil. On the basis of a direct shearing instrument of soil, necessary improvement is made for simulating the sliding friction of pile soil, and a special pile soil sliding friction testing instrument is designed, so that the static friction and the sliding friction of pile soil can be tested under different bearing stratum conditions, and the static friction and the sliding friction of pile soil can be relatively well measured under different testing conditions. By using a special shearing box, the situation that the contact area is changed in an ordinary shearing process is effectively avoided; as springs for simulating a soil body are additionally arranged, the shearing speed is increased, and the measurement on the friction of pile soil with a bearing stratum and without a bearing stratum can be relatively well completed.

Description

Technical field: [0001] The invention relates to a static friction and sliding friction simulation test method between piles and soil, which belongs to the innovative technology of static friction and friction friction testing between piles and soil. Background technique: [0002] With the large-scale use of static pressure piles, the theoretical research on static pressure piles has attracted the attention of engineering circles. The theory of the pile sinking mechanism and the timeliness of bearing capacity of static pressure piles are closely related to the friction between piles and soil. Therefore, the friction problem between piles and soil has attracted the attention of many scholars, and many scholars have carried out indoor friction tests between piles and soil. However, at home and abroad, there is no special testing instrument for static friction and sliding friction between piles and soil, and they are all carried out in direct shear instrument, ring shear instr...

Claims

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Application Information

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IPC IPC(8): G01N19/02
Inventor 汤连生胡永强罗珍贵桑海涛
Owner SUN YAT SEN UNIV
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