Establishment Method of Similarity Criterion for Consolidation Model Test

Abstract

The present invention proposes a method for establishing a similarity criterion for a consolidation model test, the method steps: assuming the thickness of the original site soil layer, the thickness of the soil layer in the model, so the geometric similarity constant C l is H 1 with H 2 The ratio of ; the type of soil in the model is the same as the original site, and the weight γ of the old soil is the same, so the load similarity constant C can be determined p ; Determine the pore pressure similarity constant C according to the dimensional similarity criterion u ;According to the analytical solution of the consolidation differential equation, determine the relationship between the time factor between the prototype and the model, thereby establishing the consolidation time similarity constant C t , geometric similarity constant C l Similar to the consolidation coefficient constant C v The relationship between the time similarity constant correction coefficient ξ was proposed, and the model test similarity criterion based on Terzaghi's one-dimensional consolidation theory was established. The beneficial effect is that the similarity criterion is applied to the model test, which can more accurately predict the pore pressure dissipation and consolidation degree development process of the original site, and the accuracy is increased by 10%-15%, making the results obtained by the model test and the prototype test results more accurate. for close.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering testing in the discipline of civil engineering, and specifically relates to a method for establishing a similarity criterion for a consolidation model test. The similarity criterion is applied to a model test to reflect the pore pressure dissipation and consolidation degree of the original site more accurately. The consolidation characteristics obtained by the model test are closer to the real results. Background technique [0002] Geotechnical model test plays an important role in soil mechanics research. It can not only reveal various mechanical behavior mechanisms of soil, but also provide basis and test for geotechnical engineering design and construction. Since Terzaghi founded the one-dimensional saturated soil theory in 1925, many scholars at home and abroad have conducted a lot of research on the consolidation problem, among which the model test has become one of the most ...

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Problems solved by technology

However, because its parameters are difficult to determine and the calculation process is too complicated, it is rarely used in actual construction calculations, so Terzaghi's one-dimensional consolidation theory is still the recommended method for calculating consolidation settlement in current codes

[0003] At present, there is no widely used effective method to deal with the disadvantages of Terzaghi's one-dimensional consolidation theory, and an accurate and reasonable similarity criterion for building models is the basis of model tests. Therefore, there is an urgent need for a reasonable similarity criterion for consolidation model tests build method

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