A three-dimensional deformation field visualization test device and test method of pile-supported reinforced embankment

Abstract

The invention provides a three-dimensional deformation field visualization test device and test method of a pile-supported reinforced embankment. The test device includes a model tank, several model piles and pile caps. The model tank is made of transparent material, and the whole is a rectangular box. When working, the model groove is placed on the optical platform. The bottom of the model stake is inserted into the groove. The lasers emitted by the three lasers form three laser planes in the transparent soil. During the test, control the drainage valve to release the water in the lower model tank at a constant rate to simulate the settlement process of the soft soil layer under the weight of the embankment fill. The test method of the test device includes the steps of test design, model making, model groove positioning, pile arrangement, soil preparation, test and data processing. The settlement mode of the device conforms to reality, is safe, reliable and cost-saving.

Description

technical field [0001] The invention relates to a model test technology in the field of foundation treatment, in particular to a three-dimensional deformation field visualization test device and test method of a pile-supported reinforced embankment. Background technique [0002] my country has a vast territory and varied geological conditions. There are a large number of soft soils distributed in coastal plains, deltas, banks of rivers and lakes, and valleys between mountains. When building expressways and high-speed railways, they have to pass through these areas because of the limited route selection. Soft soil usually has high water content, high compressibility, low bearing capacity, and some are rich in organic matter, and due to poor permeability, it is difficult to achieve a good consolidation effect in a short period of time. If it is not dealt with, it may cause excessive settlement of roads and railways, which will affect the use. [0003] Due to the existence of...

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Problems solved by technology

[0004] Because the soil is non-transparent, the traditional photogrammetry method can only measure the deformation of the soil surface, and cannot observe the internal deformation of the soil.

If you want to measure the internal deformation of the pile-supported embankment, you need to bury the displacement measuring device in the embankment to obtain the deformation data. However, many model tests are small in size, and the measuring devices and cables buried in the soil will seriously interfere with the movement of the soil. Bearing performance, the data obtained are only scattered data of several feature points, and the three-dimensional deformation field inside the soil cannot be obtained

[0005] There is a transparent soil model test method in the prior art, but this method has many deficiencies: water bags are used to simulate foundation settlement, and holes consistent with the pile spacing need to be reserved on the water bags. Water bag; due to the serious shape effect of the water bag and the complex force, it is easy to cause uneven deformation of the surface of the water bag after water is released; the model pile and the pile cap are bonded to the bottom of the model box, the position accuracy is difficult to control, and it is easy to tilt; geogrid is used For the simulated reinforced layer, the strength and modulus of the material are too large, and the similarity is not satisfied in the small-scale model test; the deformation is not easy to recover after the water bag is released; part of the foundation of the water bag and part of the embankment of transparent soil are placed in a model tank, which is inconvenient to install and to disassemble

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