Earthquake liquefaction discrimination method and device suitable for fine-grained soil sand

Abstract

The invention discloses an earthquake liquefaction discrimination method and device suitable for fine-grained soil sand. The method comprises the following steps: obtaining a plasticity index of fine-grained soil in fine-grained soil sand to be discriminated; if the plasticity index is greater than or equal to the set threshold value, substituting the actual content of the clay content into a liquefaction discrimination formula for liquefaction discrimination; when the plasticity index is less than the set threshold value, substituting 3% of the clay content into the liquefaction discrimination formula for liquefaction discrimination. By using the method, the accuracy of fine-grained soil sand liquefaction judgment can be improved.

Description

technical field [0001] The invention belongs to the technical field of engineering survey, in particular to an earthquake liquefaction discrimination method and device suitable for fine-grained soil sand. Background technique [0002] There are dozens of methods for discriminating foundation soil liquefaction at home and abroad, and more than a dozen mature ones have been included in various domestic and foreign codes. The Standard Penetration test discriminant method. [0003] The standard penetration critical hit number discrimination method is based on the Xingtai earthquake (1966), Tonghai earthquake (1970), Haicheng earthquake (1975), Tangshan earthquake (1976) and foreign major earthquake data and indoor The research results of the liquefaction test are determined based on the identification method established based on the liquefaction investigation during the actual earthquake. It is adopted by the building seismic design code and is one of the most commonly used liqu...

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Problems solved by technology

[0035] Fine-grained soil sand refers to sandy soil with a fine-grained content > 15% and ≤ 50%, which is different from pure sandy soil with high fine-grained soil content, high clay content, high plasticity index, and high cohesion. The above analysis of "the liquefaction discrimination is easy to be confused when the content of fine-grained soil is high" shows that if the liquefaction discrimination formula stipulated in the existing seismic codes is used to judge the liquefaction of fine-grained soil and sandy foundation soil, there will be misjudgment. The liquefaction discrimination formula recommended by the design code is modified to adapt to the liquefaction discrimination of the foundation soil of fine-grained soil sand

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