使用替代方法进行液化评估:胡志明市地层案例研究

IF 1 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Geosciences Journal Pub Date : 2024-03-27 DOI:10.1007/s12303-024-0006-4
Nhat-Phi Doan, Duy Triet Doan, Van Nam Nguyen, Sung-Sik Park
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引用次数: 0

摘要

众所周知,液化是指在地震荷载作用下,饱和土壤的剪切强度和刚度因孔隙水压力的产生而降低的一种现象。因此,液化引起的沉降会导致严重破坏,包括建筑物开裂或斜坡坍塌,对人类生命和财产构成威胁。在现行的越南标准 TCVN 9386:2012 中,液化潜在危害通常采用简化方法进行评估,该方法仅确定液化风险较高的区域。安全系数 (FS)、沉降 (S)、液化潜势指数 (LPI) 和液化严重度数 (LSN) 的预测尚未得到足够的重视,因此尚未形成完整的标准。本研究根据胡志明市的标准贯入试验 (SPT) 数据,采用四种常规方法评估了越南胡志明市场地的液化情况:简化程序、线性等效分析、松散耦合有效应力分析和完全耦合有效应力分析。基岩处的输入地面运动采用了与越南标准 TCVN 9386:2012 中的设计反应谱相一致的一类地震事件。根据不同方法的结果,提出了地面沉降、LPI 和 LSN 图,作为在此类土壤上进行建筑工程的有用参考,因为此类土壤可能具有较高的液化和沉降潜力。
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Liquefaction assessment using alternative approaches: a case study of Ho Chi Minh City stratigraphy

Liquefaction has been known as a phenomenon in which the shear strength and stiffness of saturated soil are reduced by the generation of pore water pressure under earthquake loading. Consequently, liquefaction-induced settlement can result in severe damage including building cracks or slope failure, which pose a threat to human lives and properties. In the current Vietnamese standard TCVN 9386:2012, liquefaction potential hazard is often evaluated using the simplified method, which solely identifies the areas with a high risk of liquefaction. Prediction of Safety Factor (FS), Settlement (S), Liquefaction Potential Index (LPI), and Liquefaction Severity Number (LSN) has not received sufficient attention to a completeness standard. This study assesses the liquefaction of the site at Ho Chi Minh City, Vietnam by using four conventional methods: the simplified procedure, linear equivalent analysis, loosely-coupled effective stress analysis, and fully-coupled effective stress analysis based on standard penetration test (SPT) data in Ho Chi Minh Metropolitan City. A class of seismic events that are compatible with the design response spectrum in the Vietnamese standard TCVN 9386:2012 is used as input ground motion at the bedrock. According to the results of different methods, maps of ground settlement, LPI, and LSN are proposed as useful references for construction works on such soils, which may have a high potential for liquefaction and subsidence.

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来源期刊
Geosciences Journal
Geosciences Journal 地学-地球科学综合
CiteScore
2.70
自引率
8.30%
发文量
33
审稿时长
6 months
期刊介绍: Geosciences Journal opens a new era for the publication of geoscientific research articles in English, covering geology, geophysics, geochemistry, paleontology, structural geology, mineralogy, petrology, stratigraphy, sedimentology, environmental geology, economic geology, petroleum geology, hydrogeology, remote sensing and planetary geology.
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