Scholarlink

<p>In this paper, the undrained simple shear behaviour of Toyoura sand specimens, isotropically consolidated at various initial effective mean stress levels (p<sub>0</sub>′ = 100 − 400&#xa0;kPa) and void ratios (e<sub>0</sub> = 0.884 − 0.667), was investigated using a large strain torsional shear apparatus (TSS). As anticipated loose sand showed fully contractive strain-softening behaviour which was followed by flow failure and extremely large shear deformation upon the instability state. Furthermore, medium dense sand exhibited only limited flow upon phase transformation (PT) state and at large shear stress (τ) levels the ultimate steady state (USS) of deformation was achieved. In contrast to previous studies, however, a peculiar behaviour was observed for dense sand, for which the predominant dilative strain-hardening response was characterised by a clear ultimate peak stress state (UPS) at failure. The data points at PT and USS (or UPS) plotted in terms of e–p′–τ relationships, indicated that (1) the stress-dependent PT lines obtained in this study from TSS are essentially consistent with that of previous studies; (2) yet, stress-dependent USS lines can be also established for sand, which is in contrast with finding from previous relevant studies.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Undrained Strength and Deformation Behavior of Saturated Sand Under Large Strain Torsional Shear Tests

  • 期刊论文

  • 发表日期：

    2026年1月13日

查看全文
  • Muhammad Umar,
  • Takashi Kiyota,
  • Gabriele Chiaro

摘要

In this paper, the undrained simple shear behaviour of Toyoura sand specimens, isotropically consolidated at various initial effective mean stress levels (p0′ = 100 − 400 kPa) and void ratios (e0 = 0.884 − 0.667), was investigated using a large strain torsional shear apparatus (TSS). As anticipated loose sand showed fully contractive strain-softening behaviour which was followed by flow failure and extremely large shear deformation upon the instability state. Furthermore, medium dense sand exhibited only limited flow upon phase transformation (PT) state and at large shear stress (τ) levels the ultimate steady state (USS) of deformation was achieved. In contrast to previous studies, however, a peculiar behaviour was observed for dense sand, for which the predominant dilative strain-hardening response was characterised by a clear ultimate peak stress state (UPS) at failure. The data points at PT and USS (or UPS) plotted in terms of e–p′–τ relationships, indicated that (1) the stress-dependent PT lines obtained in this study from TSS are essentially consistent with that of previous studies; (2) yet, stress-dependent USS lines can be also established for sand, which is in contrast with finding from previous relevant studies.