空心圆柱扭剪试验模拟砂压桩工作历程的应力历程

IF 3.3 2区工程技术 Q2 ENGINEERING, GEOLOGICAL

Soils and Foundations Pub Date : 2025-05-22 DOI:10.1016/j.sandf.2025.101628

Hiroshi Yabe , Junichi Koseki

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引用次数: 0

摘要

砂压桩法（SCP）是一种广泛应用的地基改善技术，它通过钻穿和反复拔/再钻套管来建造砂桩，以提高地基密度。该方法是日本国内应用最广泛的液化对策方法。虽然SCP的改善效果主要归因于由此导致的土壤密度的增加，但最近的研究表明，SCP工作过程中引起的应力历史（如增加的侧压力和剪切历史）也对其效果起着重要作用。为了更准确地再现砂桩施工过程中的地基行为，将模拟SCP工作过程的应力历史应用于空心柱扭剪试验试件，观察应力历史对砂桩施工过程的影响。试件初始固结时，侧向应力比为0.5 （K0 = 0.5）。随后，应用应力史，包括增加的侧向应力和循环剪切应力。最后，通过循环加载对液化抗力进行了评估。施加应力历史后，观察到这些试样的液化阻力增加。这一增幅大于仅受侧向应力增加而不受剪应力历史影响的试件。即使在应用应力历史后降低了侧向应力，这种增加趋势仍然存在。最后对试验结果进行分析，并与相对密度与液化阻力的关系进行比较，评价应力历史对液化阻力的影响。

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Hollow cylindrical torsional shear test simulating stress history of sand compaction pile work history

The Sand Compaction Pile (SCP) method is a widely utilized ground improvement technology that enhances the density of the ground by constructing sand piles through penetration and repeated withdrawal/re-driving of a casing pipe. This method is the most widely used liquefaction countermeasure method in Japan.

While the improvement effect of SCP is predominantly attributed to the resultant increase in soil density, recent studies have suggested that the stress history (such as increased lateral pressure and shear history) induced during the SCP work process also contributes significantly to its effectiveness. In order to more accurately reproduce the behavior of the ground during the construction of Sand Piles, the stress history simulating the SCP work process was applied to specimens in hollow cylindrical torsional shear tests, and the effects of the stress history were observed.

The specimens were initially consolidated with a lateral stress ratio of 0.5 (K₀ = 0.5). Subsequently, a stress history including increased lateral stress and cyclic shear stress was applied. Finally, liquefaction resistance was assessed through cyclic loading.

After applying the stress history, an increase in liquefaction resistance was observed in these specimens. This increase was larger than that of specimens subjected only to a lateral stress increase without the shear stress history. This increasing trend persisted even after the lateral stress was reduced following the application of stress history.

Finally, these test results were analyzed to assess the impact of stress history on liquefaction resistance by comparing them with the relationship between relative density and the liquefaction resistance.

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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.