2007年新泻县中崎地震对软土长期沉降的影响研究

IF 3.3 2区工程技术 Q2 ENGINEERING, GEOLOGICAL

Soils and Foundations Pub Date : 2025-02-01 DOI:10.1016/j.sandf.2024.101536

Yazhou Jiang , Koichi Isobe , Satoru Ohtsuka , Toshiyuki Takahara

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引用次数: 0

摘要

在2007年的新泻县中越树地震中，沙丘脚下和旧河道的地面液化非常明显。虽然在地震后粘土地面没有发现明显的灾害，但在柏崎市新桥地区，地震后观察到地面的长期沉降。在一个观测点，地震发生14年后，各层从地表到23 m深度的累计地面沉降已达到71 mm。为了研究地震过程中变形和震后长期沉降的机理，本研究进行了地面调查，如在观测点进行钻孔调查和室内取样土单元试验。结果表明，样品土壤非常柔软，可压缩性强，结构相对较高。随后，采用Zhang等（2007）开发的转化应力-循环迁移率（TS-CM）本构模型对室内单元试验结果进行模拟，并根据试验结果确定土体参数。TS-CM模型包含Hashiguchi（1977）描述的次加载和Asaoka等人（2002）描述的超加载的概念。为此，采用TS-CM本构模型和确定的参数，对地基进行土-水耦合弹塑性有限元模拟。有限元模拟结果与现场实测沉降数据吻合较好。在此基础上，讨论了软土的震后行为及其作用机理，并对后续沉降进行了预测。模拟结果表明，由于地震动和地震后固结过程中产生的超孔隙水压力较大，该场地结构相对较高的易感粘土比结构相对较低的易感粘土具有更大的长期固结潜力。通过对两种粘土的固结试验验证了这一结论。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Study on long-term subsidence of soft clay due to Niigata-ken Chuetsu-oki earthquake of 2007

In the Niigata-ken Chuetsu-oki Earthquake of 2007, ground liquefaction was outstanding at the foot of a sand dune and in old river channels. Although no distinct disaster was found in the clayey ground after the earthquake, the long-term settlement of the ground was observed after the earthquake in the Shinbashi district of Kashiwazaki City. At one observation site, the cumulated ground subsidence of the layers from the ground surface to a depth of 23 m had reached 71 mm 14 years after the earthquake. In order to study the mechanism of the deformation during the earthquake and the long-term settlement after the earthquake, ground investigations, such as a boring survey at the observation site and indoor element tests on sampled soil, were conducted in this study. The results showed that the sampled soil was very soft, strongly compressible, and relatively highly structured. Subsequently, the transformation stress-cyclic mobility (TS-CM) constitutive model, developed by Zhang et al. (2007), was used to simulate the results of the indoor element tests, and the soil parameters were determined based on the results of these tests. The TS-CM model contains the concepts of subloading, described by Hashiguchi (1977), and superloading, described by Asaoka et al. (2002). Therefore, the subsidence behavior of the ground was simulated by a soil–water coupling elasto-plastic finite element (FE) analysis using the TS-CM constitutive model and the determined parameters. The FE simulation results agreed well with the actual site subsidence observation data. Based on the simulation results, the post-earthquake behavior of the soft clay and its mechanism were discussed, and the successive subsidence was predicted forward. According to the simulation results, the relatively highly structured susceptible clay at this site was found to have greater potential in terms of long-term consolidation than relatively less structured susceptible clay due to the large excess pore water pressure generation during the ground motion and the consolidation process after the earthquake. This conclusion was verified by consolidation tests on two types of clay.

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来源期刊

Soils and Foundations 工程技术-地球科学综合

CiteScore

6.40

自引率

8.10%

发文量

审稿时长

5 months

期刊介绍： Soils and Foundations is one of the leading journals in the field of soil mechanics and geotechnical engineering. It is the official journal of the Japanese Geotechnical Society (JGS)., The journal publishes a variety of original research paper, technical reports, technical notes, as well as the state-of-the-art reports upon invitation by the Editor, in the fields of soil and rock mechanics, geotechnical engineering, and environmental geotechnics. Since the publication of Volume 1, No.1 issue in June 1960, Soils and Foundations will celebrate the 60th anniversary in the year of 2020. Soils and Foundations welcomes theoretical as well as practical work associated with the aforementioned field(s). Case studies that describe the original and interdisciplinary work applicable to geotechnical engineering are particularly encouraged. Discussions to each of the published articles are also welcomed in order to provide an avenue in which opinions of peers may be fed back or exchanged. In providing latest expertise on a specific topic, one issue out of six per year on average was allocated to include selected papers from the International Symposia which were held in Japan as well as overseas.