Pile-supported type reinforced embankment three-dimensional deformation field visual test device and test method thereof

Abstract

The invention provides a pile-supported type reinforced embankment three-dimensional deformation field visual test device and a test method thereof. The test device includes a model groove, a plurality of model piles, and pile caps. The model groove is made of a transparent material and is a rectangular box as a whole. In operation, the model groove is placed on an optical table. The bottom of each model pile is inserted into the groove. The lasers emitted by three lasers forms three laser planes in transparent soil. During a test, a drain valve is controlled to discharge water in a lower model groove at a constant rate, and a settlement process of a soft soil layer under the self-weight of embankment fill soil is simulated. The test method of the test device includes the steps of test design, model making, model groove positioning, pile arrangement, soil mixing, testing and data processing. A settling mode of the device is consistent with the reality, and the device is safe and 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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