A kind of model soil for simulating Tianjin silty clay for dynamic test and preparation method

Abstract

The invention belongs to the field of soil mechanics tests and provides a model soil for dynamic model tests simulating Tianjin silty clay and a preparation method thereof. The model soil includes the following components in mass percentage: sawdust 18%, river sand 27%, silty clay 55%, and moisture content 50%. The preparation method includes the following steps: (1) weighing sawdust, river sand and silty clay according to the proportion; (2) mixing each component evenly, adding water and mixing evenly. Compared with the prior art, the prepared The model soil and Tianjin silty clay meet the main similarity relationship under different confining pressures, and the G / G of the model soil and the prototype soil is obtained by creating and quantifying the function max‑γ The dynamic characteristic curves have a high similarity. In addition, by adjusting the ratio and water content of sawdust, river sand and silty clay, other soil quality simulations related to dynamic model tests can be performed, and the ratio of other model soils can be determined through quantitative analysis through the function created by the invention.

Description

technical field [0001] The invention belongs to the field of soil mechanics tests, and relates to a model soil used in civil engineering and underground engineering, in particular to a model soil technology for simulating silty clay in Tianjin area for dynamic tests. Background technique [0002] So far, the theory of interaction between underground structure, soil and superstructure under earthquake is not mature. In order to better restore the dynamic response of tunnel and superstructure under earthquake, it is often necessary to carry out earthquake simulation shaking table test in the seismic design of related structures. Provide certain test data; a key issue in the shaking table simulation test of the superstructure-soil-tunnel interaction system is that the acceleration similarity ratios between the various parts of the system should match each other, so the design of the model soil is very important. [0003] In general, the model soil in engineering tests should ha...

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Problems solved by technology

[0008] The complexity and diversity of soils and the large number of mechanical properties parameters make the preparation of model soils more difficult. So far, most researchers have aimed to satisfy the main similarity relationship in the preparation of model soils for shaking table dynamic characteristics tests, but the obtained test results are often Failed to better meet the expected goals, especially in the G / G of model soil and prototype soil max - The similarity of the γ dynamic characteristic curve is less considered, and no strict quantitative analysis is done

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