Air-contained soil pile soil testing device

Abstract

The invention relates to the field of pile foundation engineering technologies, in particular to an air-contained soil pile soil testing device. The device comprises a sealing cabin and an axial pressure testing device, wherein a test soil sample and a precast pile in mutual contact are arranged in the sealing cabin; the axial pressure testing device extends into the sealing cabin to drive the precast pile and the test soil sample to take cyclic shear testing, and displacement, torque, temperature, pressure and hole pressure data is recorded; and air content in air-contained soil is calculated. The air-contained soil pile soil testing device has the function of a conventional pile-soil interface shear instrument, precise preparation of a soil mass with quantitative air content is realizedthrough an air-contained soil generation system, and the interaction between the soil mass with different air content and the pile can be obtained; and automatic collection is realized in the acting process, and the data is accurate.

Description

technical field [0001] The invention relates to the technical field of pile foundation engineering, in particular to a pile-soil test device for air-containing soil. Background technique [0002] The pile-soil interaction test is usually tested with a pile-soil interface shear stress test device, which can measure the force change when the test soil sample and the prefabricated pile undergo relative motion, so as to obtain the pile-soil interaction under monotonic loading or cyclic loading. Interaction parameters. However, the current test device for pile-soil interaction cannot be directly used for testing the shear stress of air-bearing soil-pile interface. The main reasons are as follows: [0003] (1) It cannot be sealed, and the existence of air-bearing soil requires relatively closed conditions. However, the current devices are all open devices, and the parallel movement between the prefabricated pile and the soil occurs through the loading device. For example, the pat...

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Problems solved by technology

However, the current test device for pile-soil interaction cannot be directly used for testing the shear stress of air-bearing soil-pile interface. The main reasons are as follows:

[0003] (1) It cannot be sealed, and the existence of air-bearing soil requires relatively closed conditions. However, the current devices are all open devices, and the parallel movement between the prefabricated pile and the soil occurs through the loading device. For example, the patent number is: CN201710050592.1 "A shear test device for pile-soil contact surface", patent number: CN201810778084.X "Single pile cyclic t-z model parameter measurement device based on test soil sample deformation and shear zone development", patent number: CN201710286569. 2's "A simple test method for measuring the long-term shear strength of pile-soil contact surface", the patent number is: CN201710689799.3 "A large-scale direct shear test method for pile-soil interaction considering the effect of temperature", etc.;

[0004] (2) The air-soil test device cannot directly test the interaction between piles and soil. At present, the air-soil test mainly focuses on unit tests, such as the patent number: CN201820038132.7 "A Consolidation Test Device for Air-soil ", the patent number is: CN201420037515.4 "High Pressure Dissolved Air Saturation Test Device", etc. In marine engineering, piles and soil will undergo relative motion and interaction directly under the action of cyclic loads, which will affect the bearing capacity of pile foundations. The test The soil sample unit test is a device for testing the mechanical properties of the test soil sample under cyclic loading, and there is an essential difference between the two

[0005] The soil samples in the shallow air-bearing test are widely distributed, and the research on the pile-soil interaction in the shallow-air test soil sample has just started. The key to the interaction, however, neither the traditional interface shear instrument nor the air-bearing soil unit test device can realize the interaction parameter test

If the air-bearing soil is directly generated in the device, if a traditional interface shearing instrument is used, the air-bearing soil needs to be produced outside, and the test soil sample is put into the shearing instrument, and the test soil in the process is The gas will be lost, so the gas content of the test soil sample cannot be accurately determined, and it is even impossible to prepare a test soil sample containing gas for sandy soil.

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