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Shear wave velocity estimation method based on standard penetration test

A standard penetration test and standard penetration technology, which is applied in the field of foundation soil survey, infrastructure engineering, construction, etc., and can solve the problem of low accuracy, misjudgment of the type of construction site, and inability to perform shear wave testing, etc. problem, to achieve the effect of improving accuracy

Inactive Publication Date: 2019-05-17
SOUTHEAST UNIV +1
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Problems solved by technology

In the feasibility study stage of the site, if drilling is not carried out, the shear wave test cannot be carried out. How to estimate the wave velocity more accurately has become an urgent problem to be solved.
Existing codes provide an estimation formula for shear wave velocity, but in actual use, it can be found that its accuracy is not high, which often leads to misjudgment of the type of construction site and cannot meet the requirements of engineering use

Method used

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  • Shear wave velocity estimation method based on standard penetration test
  • Shear wave velocity estimation method based on standard penetration test
  • Shear wave velocity estimation method based on standard penetration test

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Embodiment Construction

[0015] Such as figure 1 As shown, a shear wave velocity estimation method based on standard penetration experiments includes the following steps:

[0016] Step (1): Define the representative soil layer, determine the soil type, and determine the standard penetration parameter N value corresponding to each representative soil layer;

[0017] In order to reduce the dispersion of the standard penetration parameter N value, when the thickness of the same soil layer is large, the standard penetration test points in the soil layer are grouped, and the average value is taken as the reference N value, according to the situation of the given data , use the following method to group the data;

[0018] a. When the thickness of the soil layer d≤2m, divide them into one group, and within this range, there is only one standard penetration test point;

[0019] b. When the thickness of the soil layer is 2m

[0020] c. When the thickness of the soil layer d>5m,...

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Abstract

The invention discloses a shear wave velocity estimation method based on a standard penetration test. The method applies grey relational analysis and takes account the influence of a soil layer effective upper overbarden pressure sigma'v and void ratio e; a relationship expression of a standard penetration value N, the soil layer effective upper overbarden pressure sigma'v, a void ratio e value and shear wave velocity is established by a function fitting method, and thereby the shear wave velocity is estimated. The method can be used for conveniently measuring and calculating the shear wave velocity on the basis of a conventional standard penetration test and has high measuring accuracy.

Description

technical field [0001] The invention belongs to the field of foundation soil site category discrimination in geotechnical engineering investigation and building anti-seismic, and relates to a shear wave velocity estimation method based on a standard penetration test. Background technique [0002] At present, judging the building site category according to the range of equivalent shear wave velocity is one of the recognized site category classification methods. The site category has a great influence on the seismic design of building structures, and even affects the selection of structural schemes. In the feasibility study stage of the site, if drilling is not carried out, the shear wave test cannot be carried out. How to estimate the wave velocity more accurately has become an urgent problem to be solved. Existing codes provide an estimation formula for shear wave velocity, but in actual use, it can be found that its accuracy is not high, which often leads to misjudgment of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D1/02
Inventor 赵学亮刘益平丁鹏程张驰黄钺余涛任治军任亚群葛海明王小龙王俊超吴学银孙焯
Owner SOUTHEAST UNIV
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