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Effects of small and large shear histories on multiple liquefaction properties of sand with initial static shear
Soils and Foundations ( IF 3.3 ) Pub Date : 2019-12-01 , DOI: 10.1016/j.sandf.2019.11.001
Tokio Morimoto , Yudai Aoyagi , Junichi Koseki

Abstract It has been reported that soils belonging to slope grounds show different types of liquefaction behavior than those belonging to horizontal grounds. Some research has also revealed that liquefaction histories can significantly affect the shear behavior of sandy soils. However, the combined effects of the slope angle and the magnitude of past shear histories on the liquefaction properties of soils have not been studied comprehensively. Based on this background, several multiple liquefaction tests with initial static shear were conducted on Toyoura sand. In each of these tests, a single specimen was sheared several times up to small or large double amplitude shear strain under a constant volume condition using a specially designed stacked-ring shear apparatus. The behavior of the Toyoura sand observed in these tests was discussed considering various perspectives, such as the increase in relative density, the induced anisotropy, the change in liquefaction resistance, and the shear strain accumulation. The findings of this study established that shear histories of smaller magnitude had relatively less influence on densification and induced anisotropy than those of larger magnitude. Moreover, shear histories of smaller magnitude also resulted in the relatively higher liquefaction resistance of sand specimens against the next cyclic shear, while the opposite trend was observed in the case of specimens subjected to shear histories of larger magnitude. Finally, shear strain accumulated less easily in tests with small shear histories than in those with large shear histories.

中文翻译:

大小剪切历史对初始静剪切砂土多重液化特性的影响

摘要 据报道,属于斜坡地面的土壤与属于水平地面的土壤表现出不同类型的液化行为。一些研究还表明,液化历史会显着影响沙土的剪切行为。然而,坡角和过去剪切历史的大小对土壤液化特性的综合影响尚未得到全面研究。基于此背景,对 Toyoura 砂进行了多次初始静态剪切的多次液化试验。在这些测试中的每一个中,使用专门设计的叠环剪切装置在恒定体积条件下将单个试样剪切数次,直至达到小或大的双振幅剪切应变。考虑到相对密度的增加、诱导的各向异性、液化阻力的变化和剪切应变积累等各种角度,讨论了在这些测试中观察到的 Toyoura 砂的行为。这项研究的结果表明,较小幅度的剪切历史对致密化和诱导各向异性的影响相对较小。此外,较小量级的剪切历史也导致砂试样对下一次循环剪切具有相对较高的液化阻力,而在经受较大量级剪切历史的试样的情况下观察到相反的趋势。最后,与具有大剪切历史的测试相比,在具有小剪切历史的测试中更不容易累积剪切应变。如相对密度的增加、诱导的各向异性、液化阻力的变化和剪切应变的积累。这项研究的结果表明,较小幅度的剪切历史对致密化和诱导各向异性的影响相对较小。此外,较小量级的剪切历史也导致砂试样对下一次循环剪切具有相对较高的液化阻力,而在经受较大量级剪切历史的试样的情况下观察到相反的趋势。最后,与具有大剪切历史的测试相比,在具有小剪切历史的测试中更不容易累积剪切应变。如相对密度的增加、诱导的各向异性、液化阻力的变化和剪切应变的积累。这项研究的结果表明,较小幅度的剪切历史对致密化和诱导各向异性的影响相对较小。此外,较小量级的剪切历史也导致砂试样对下一次循环剪切具有相对较高的液化阻力,而在经受较大量级剪切历史的试样的情况下观察到相反的趋势。最后,与具有大剪切历史的测试相比,在具有小剪切历史的测试中更不容易累积剪切应变。这项研究的结果表明,较小幅度的剪切历史对致密化和诱导各向异性的影响相对较小。此外,较小量级的剪切历史也导致砂试样对下一次循环剪切具有相对较高的液化阻力,而在经受较大量级剪切历史的试样的情况下观察到相反的趋势。最后,与具有大剪切历史的测试相比,在具有小剪切历史的测试中更不容易累积剪切应变。这项研究的结果表明,较小幅度的剪切历史对致密化和诱导各向异性的影响相对较小。此外,较小量级的剪切历史也导致砂试样对下一次循环剪切具有相对较高的液化阻力,而在经受较大量级剪切历史的试样的情况下观察到相反的趋势。最后,与具有大剪切历史的测试相比,在具有小剪切历史的测试中更不容易累积剪切应变。较小量级的剪切历史也导致砂试样对下一次循环剪切具有相对较高的液化阻力,而在经受较大量级剪切历史的试样的情况下观察到相反的趋势。最后,与具有大剪切历史的测试相比,在具有小剪切历史的测试中更不容易累积剪切应变。较小量级的剪切历史也导致砂试样对下一次循环剪切具有相对较高的液化阻力,而在经受较大量级剪切历史的试样的情况下观察到相反的趋势。最后,与具有大剪切历史的测试相比,在具有小剪切历史的测试中更不容易累积剪切应变。
更新日期:2019-12-01
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