考虑空间变异性的可液化土振动探头压实效果概率评价

IF 8.4 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Shijie Zhai , Guangyin Du , Tengyuan Zhao , Yong Yang , Xiaohan He , Zifan Wang
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引用次数: 0

摘要

考虑循环阻力比(CRR)的空间变异性,评估了振动探针压实法(VPCM)在减轻液化危害方面的作用。采用贝叶斯框架识别统计均匀的CRR层和随机场模型参数,准确确定VPCM对不同深度CRR的影响。利用蒙特卡罗模拟,确定了可液化土层与总土层厚度的概率比,以确定可液化土层和量化液化严重程度。结果表明,在处理过程中,VPCM使各土层的CRR统计特性均匀化。由于松动,浅层的CRR不确定性和波动幅度减小,而深层的CRR变异性增加,但抗液化能力增强。采用概率分析方法对统计均匀土层的液化风险进行了评价。深层可液化土层经处理后由严重液化易感性转变为轻微液化或不液化。这些发现突出了VPCM的双重作用:有效地降低了深层液化的严重程度,同时引入了土壤均匀性和不确定性的深度依赖权衡。当优先考虑深层稳定性而不是浅层CRR一致性时,该方法提供了一种可行的缓解策略。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Probabilistic evaluation of vibratory probe compaction effects on liquefiable soil considering spatial variability
This study assesses the role of the vibratory probe compaction method (VPCM) in mitigating liquefaction hazards, considering the spatial variability of the cyclic resistance ratio (CRR). A Bayesian framework was employed to identify statistically homogeneous CRR layers and the random field model parameters to accurately determine the impact of VPCM on CRR at different depths. The liquefiable to total soil thickness ratio was probabilistically determined using Monte Carlo simulations to identify liquefiable soil layers and quantify liquefaction severity. Results reveal that VPCM homogenizes CRR statistical properties across soil layers during treatment. Shallow layers showed reduced CRR uncertainty and scale of fluctuation due to loosening, whereas deeper layers exhibited improved liquefaction resistance but increased CRR variability. Probabilistic analysis was conducted to evaluate liquefaction risk in statistically homogeneous soil layers. Deep liquefiable soil layers transitioned from severe liquefaction susceptibility to slight or no liquefaction after treatment. These findings highlight VPCM's dual role: effectively reducing liquefaction severity in deep layers while introducing depth-dependent trade-offs in soil homogeneity and uncertainty. The method offers a viable mitigation strategy when prioritizing deep-layer stability over shallow-layer CRR consistency.
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来源期刊
Engineering Geology
Engineering Geology 地学-地球科学综合
CiteScore
13.70
自引率
12.20%
发文量
327
审稿时长
5.6 months
期刊介绍: Engineering Geology, an international interdisciplinary journal, serves as a bridge between earth sciences and engineering, focusing on geological and geotechnical engineering. It welcomes studies with relevance to engineering, environmental concerns, and safety, catering to engineering geologists with backgrounds in geology or civil/mining engineering. Topics include applied geomorphology, structural geology, geophysics, geochemistry, environmental geology, hydrogeology, land use planning, natural hazards, remote sensing, soil and rock mechanics, and applied geotechnical engineering. The journal provides a platform for research at the intersection of geology and engineering disciplines.
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