A kind of model test foundation soil and preparation method thereof

Abstract

The invention relates to a model test foundation soil and a preparation method thereof, belonging to the field of architecture and civil engineering. It is composed of powdered bentonite and glycerin; the mass ratio of bentonite and glycerin required for the model test is determined through the cross-plate shear experiment, and the bentonite and glycerin are fully mixed with a kneading geotechnical mixer according to the obtained mass ratio, and then used The compaction is carried out by drop hammer, so that the glycerin fills the pores between the bentonite particles. The foundation soil of the present invention not only has physical and mechanical properties similar to naturally formed soils, but also has more stable properties; compared with naturally formed soils, when the foundation soil of the present invention reaches a steady-state undrained shear strength, its It takes less time and saves test time; the foundation soil does not need to be consolidated in the test, has no volatility, and can be reused to avoid the waste of test materials. Problems with strength growth due to excessive drainage. Moreover, the production process of the present invention is simple, the implementation is simple and easy, 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