Model test foundation soil and preparation method thereof

Abstract

The invention relates to model test foundation soil and a preparation method thereof, and belongs to the field of building and civil engineering. The model test foundation soil consists of powdered bentonite and glycerinum. The preparation method comprises the following steps of determining a mass ratio of bentonite to glycerinum needed by a model test through vane shear tests, uniformly and adequately mixing the bentonite and the glycerinum by utilizing a kneading civil engineering stirrer according to the acquired mass ratio so as to obtain a mixture, compacting the mixture by utilizing a drop hammer, and enabling the glycerinum to be adequately filled in gaps among bentonite particles. The foundation soil not only has the physical and mechanical properties similar to naturally formed soil, but also relatively stable in character; compared with the naturally formed soil, when the foundation soil achieves the steady non-water-discharging shear strength, the consumed time is relatively short, and the test time is reduced; the foundation soil does not need to be solidified in the test, has no volatility and can be reused, the waste of test materials can be avoided, the strength of the foundation soil before and after the model test is slightly varied, and the problem that the strength is improved due to excessively fast water discharging in the model test process can be avoided. The production process is simple, the simplicity and the easiness in implementation can be achieved, and the applicability is wide.

Description

technical field [0001] The invention relates to the field of architectural civil engineering, in particular to a model test foundation soil and a preparation method thereof. Background technique [0002] Scaled-scale physical model test is an economical and effective test method, especially when it involves the study of soil-structure interaction during earthquakes. Among them, one of the biggest challenges in doing scale-down physical model tests is how to obtain a physical model soil that can fully simulate the seismic response of the prototype soil. Some naturally occurring soils or artificially formulated remolded soils have been used in scale model tests, including structural tests on soft soil foundations; although most physical model soils have proven useful, they Its performance is greatly affected by factors such as stress time history, thixotropy, and consolidation during the spinning process of the centrifuge test. At the same time, when the soil formed in natur...

AI Technical Summary

Problems solved by technology

Some naturally occurring soils or artificially formulated remolded soils have been used in scale model tests, including structural tests on soft soil foundations; although most physical model soils have proven useful, they Its performance is greatly affected by factors such as stress time history, thixotropy, and consolidation during the spin process of the centrifuge test.

At the same time, when the soil formed in nature or artificially prepared remolded soil is used as the foundation soil for model tests, in order to simulate the actual situation more realistically, it is often necessary to form the initial stress through pre-consolidation to achieve the required initial strength and stiffness, but The time required for the pre-consolidation process is too long, and time becomes an important factor affecting the model test, and its strength changes greatly before and after the model test, and there is a problem of strength growth due to excessive drainage during the model test

In addition, the physical model soil used as a substitute for the original soil in the test is usually difficult to prepare, and it is difficult to place it in the shear box used in the test, and due to the drying and dehumidification operations during the test, these soils Usually used only once, poor reusability

[0003] In summary, due to the above shortcomings of naturally formed soil or artificially prepared remolded soil, it limits the versatility of the model soil, especially when it is applied to the centrifuge test, the requirements for the model soil are more stringent