Liquefaction probability formula of shear wave velocity based on 
conventional parameters of soil layer

YANG Yang; SUN Rui; CHEN Zhuo-shi; YUAN Xiao-ming

doi:10.16285/j.rsm.2018.0705

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Liquefaction probability formula of shear wave velocity based on conventional parameters of soil layer

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- Liquefaction probability formula of shear wave velocity based on conventional parameters of soil layer
- Vol. 40, Issue 7, Pages: 2755-2764(2019)
- 作者机构：
  
  中国地震局工程力学研究所地震工程与工程振动重点实验室,黑龙江,哈尔滨,150080
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2018.0705
  CLC： TU435
- Online First：28 July 2019，
  
  Published：2019
- 稿件说明：
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YANG Yang, SUN Rui, CHEN Zhuo-shi, et al. Liquefaction probability formula of shear wave velocity based on conventional parameters of soil layer[J]. 2019, 40(7): 2755-2764.
DOI：

YANG Yang, SUN Rui, CHEN Zhuo-shi, et al. Liquefaction probability formula of shear wave velocity based on conventional parameters of soil layer[J]. 2019, 40(7): 2755-2764. DOI： 10.16285/j.rsm.2018.0705.

摘要

分析国际上现有液化场地剪切波速473组数据进行参数特征后，以此为基础，采用分区方法，利用成熟的Logistic模型，提出了以地表峰值加速度、剪切波速、地下水位、可液化层埋深等4个参数表达的土体液化概率计算公式和不同概率下液化临界值计算公式，研究了不同概率水平下公式的适用性，并与现有主要方法进行比较。研究表明：地震动强度为液化判别首要影响参数，液化层与非液化层剪切波速区分度不显著，采用以往一个公式构造液化判别公式的方式难以要达到基本要求；现有Andrus公式和石兆吉公式会将很多明显为非液化的场地误判为液化场地，违背了现有认识，达到了不可接受的程度，需要改进。文中公式取50%概率时液化点和非液化点回判成功率符合对等原则，不同烈度下成功率均在70%左右；总体看，公式表现良好，可为中国工程建设提供一个合理、可操作性强的剪切波速液化概率判别方法。

Abstract

In this study

the parameter characteristics of the database including 473 shear wave velocity test results from all over the world were analyzed. After that

the Logistic model was selected to build a new formula to evaluate the probability of liquefaction

considering four conventional parameters: PGA

shear wave velocity

water table and the depth of liquefiable layer. At last

the applicability of the formula under different probabilistic levels was studied and compared with the existing methods. This study shows that the ground vibration intensity is the primary parameter to influence liquefaction estimation. The shear wave velocity of liquefaction layer does not differentiate from the shear wave velocity of the non-liquefaction layer

so it is difficult to meet the basic requirements by using a semplice formula. The methods developed by Andrus and Shi Zhaoji misjudge many obvious non-liquefied points. Those misjudgments breach the existing knowledge and need improvements. The formula developed by this paper conforms to equal distribution of liquefaction points and non-liquefaction points when PL=50%

and the accuracy can reach about 70% in different intensity levels. In summary

this formula provides a reasonable and easy-to-use shear wave velocity liquefaction evaluation method.

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