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

A technology of fine-grained soil and soil quality, applied in the field of engineering investigation, can solve the problems of high cohesion, high plasticity index, and high content of fine-grained soil, achieve reasonable demarcation data value, improve accuracy, and solve the factors affecting soil properties the effect of limitations

Active Publication Date: 2020-06-26
NO 63921 UNIT OF PLA
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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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  • Earthquake liquefaction discrimination method and device suitable for fine-grained soil sand
  • Earthquake liquefaction discrimination method and device suitable for fine-grained soil sand
  • Earthquake liquefaction discrimination method and device suitable for fine-grained soil sand

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Embodiment Construction

[0061] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0062] Aiming at the problem that fine-grained soil sand is easy to distinguish and confuse, the invention provides an earthquake liquefaction discrimination scheme suitable for fine-grained soil sand. In view of the characteristics of fine-grained soil sand, due to the lack of regional experience, even with a few samples, it is difficult to independently formulate the liquefaction judgment method of fine-grained soil sand considering the influence of clay content. Therefore, the standard formula is directly used and slightly modified. More convenient and convenient.

[0063] In this scheme, the fine-grained soil sand is no longer simply regarded as sandy soil, but 3% is used as the clay content and substituted into the liquefaction discrimination formula for liquefaction discrimination. Instead, consider the characteristics of the fine-grained soil in th...

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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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Application Information

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IPC IPC(8): G01N33/24
CPCG01N33/24
Inventor 李兵张立乾郭宏云王新波孙崇华吴星孟良
Owner NO 63921 UNIT OF PLA
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