2022 H. Bolton Seed Memorial Lecture: Evaluating Liquefaction Effects

2022 H. Bolton Seed Memorial Lecture: Evaluating Liquefaction Effects
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2022 H. Bolton Seed 纪念讲座:评估液化效应

DOI:
10.1061/jggefk.gteng-11242
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发表时间:
2023
影响因子:
3.9
通讯作者:
Olaya, Franklin R.
Olaya, Franklin R.
中科院分区:
工程技术2区
文献类型:
--
作者:
Bray, Jonathan D.;Olaya, Franklin R.

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水平场地土壤液化的潜在影响应通过检查单个土层的土壤单元响应和它们形成的土壤沉积物的系统响应来评估。利用相对密度或状态参数,可以统一地反映均匀净砂、桑迪、非塑性粉砂和非塑性粉土在单元水平上的循环响应和液化后体积应变。沉积环境应加以表征,因为地质细节,如土壤结构,可通过高质量连续取样的详细记录来识别,在评估液化影响方面很重要。有效的应力分析使土壤系统的反应,管理液化的影响,包括喷出物的形成,进行调查。采用液化喷出物需求参数的校准圆锥贯入试验(CPT)程序捕获系统响应的关键方面,并提供喷出物引起的建筑物沉降的估计。基于概率CPT的液化后地面沉降估计程序开发使用实验室和现场的案例历史数据库。相关性的估计,使实验室为基础的体积应变模型的使用。调整系数使该程序能够捕获液化后地面沉降的现场观测结果。建议的地面沉降程序相结合的剪切和喷射引起的沉降程序来估计沉降引起的建筑物沉降。
The potential effects of soil liquefaction at level ground sites should be evaluated through examining soil element responses of the individual soil layers and system responses of the soil deposits they form. The cyclic responses and postliquefaction volumetric strain of uniform clean sand, sandy gravel, nonplastic silty sand, and nonplastic silt at the element level can be captured in a unified manner using relative density or the state parameter. The depositional environment should be characterized because geologic details, such as soil fabric, which can be discerned through detailed logging of high-quality continuous sampling, are important in evaluating liquefaction effects. Effective stress analysis enables soil system responses that govern the effects of liquefaction, including the formation of ejecta, to be investigated. A calibrated cone penetration test (CPT) procedure employing the liquefaction ejecta demand parameter captures key aspects of system response and provides an estimate of ejecta-induced building settlement. A probabilistic CPT-based procedure for estimating postliquefaction ground settlement is developed using laboratory and field case history databases. Correlations are developed to estimateorto enable use of the laboratory-based volumetric strain models. Adjustment factors enable the procedure to capture field observations of postliquefaction ground settlement. The proposed ground settlement procedure is combined with shear and ejecta-induced settlement procedures to estimate liquefaction-induced building settlement.
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