Pile soil sliding friction testing method

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...

AI Technical Summary

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 instrument.

However, the shearing speed of the direct shear instrument is relatively slow, the friction between the pile and the soil cannot reach the sliding speed during the pile sinking process, the shear area changes during the shearing process, and it cannot simulate the relationship between the pile and the soil when the pile encounters the bearing layer. However, the shortcomings such as the change of friction between the piles cannot reflect the friction between the pile and the soil during the pile sinking process of the static pressure pile.

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