A kind of pile foundation indoor model test device and test method

Abstract

The invention relates to a pile foundation indoor model test device and a test method. The test device comprises a base, a stand, a model box, a model pile, a vertical auxiliary device, a rotating auxiliary device, and a reaction force plate. The mud prepared from the soil sample to be tested is graded and pressurized to discharge half of the water in the mud, and the model box is rotated by 180° using the rotating auxiliary system, and the pressure is continued until all the remaining water in the mud is discharged, and then the vertical auxiliary device is used. The model piles shall be driven to the required depth with jacks and indoor model tests shall be carried out. The present invention reverses the unconsolidated soil body, and performs two-way drainage and consolidation of the reshaped soil under the reversal of gravity, so as to realize the uniformity of water content, density and consolidation in each depth range of the soil sample, and avoid the need for soil samples. The deviation of the basic parameters caused by the unevenness of the pile body is strictly controlled, and the test accuracy is better.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, and more particularly, to a pile foundation indoor model test device and a test method. Background technique [0002] my country has a vast territory, and the soil types are complex and diverse. In the development of new regional infrastructure without mature local experience, the soil layer design parameters of pile foundations are often unable to meet the requirements only by indoor conventional geotechnical tests. The reduction degree of the process is high, and the cost is much lower than the in-situ bearing test of the pile foundation. It is widely used in engineering construction and soil parameter scientific research. [0003] Due to the large volume of soil samples required for the model test, it is difficult to maintain the original state to retrieve the soil samples and put them into the model box for testing. It is necessary to prepare remodeled soil samples, but the co...

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Problems solved by technology

[0003] Due to the large volume of soil samples required for the model test, it is difficult to maintain the original state on site to retrieve the soil samples and put them into the model box for testing. It is necessary to prepare remolded soil samples, but the common problem at present is that the preparation time of remolded soil is too long 1. The moisture content and density of the upper and lower parts of the reshaped soil sample are not uniform, resulting in a large deviation between the most basic soil layer parameters and the original site, which affects the rationality of the model test; at the same time, the load of the model pile is large when sinking into the reshaped soil sample , it is very easy to cause the pile body to lean sideways, and in the subsequent test loading process, due to the deviation of verticality, there are large errors in the collected test parameters, which affects the accuracy of the model test

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