水-土特征曲线的不确定性对估算非饱和土抗剪强度的影响

Translated title of the contribution: Effect of the uncertainty in soil-water characteristic curve on the estimated shear strength of unsaturated soil

Qian Zhai, Harianto Rahardjo, Alfrendo Satyanaga, Guo liang Dai, Yan jun Du

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Most failures or instabilities of geotechnical structures commonly result from shear failure in soil. In addition, many infrastructures are constructed within the unsaturated zone. Therefore, the determination of shear strength of unsaturated soil is crucial in geotechnical design. The soil-water characteristic curve (SWCC) is commonly used to estimate the shear strength of unsaturated soil because the direct measurement is time-consuming and costly. However, the uncertainty associated with the determined SWCC is rarely considered in the estimation of the shear strength. In this paper, the uncertainties of SWCC resulted from different factors are reviewed and discussed. The variability of the estimated shear strength for the unsaturated soil due to the uncertainty of SWCC associated with the best fit process is quantified by using the upper and lower bounds of the determined SWCC. On the other hand, the uncertainties of the estimated shear strength due to different initial void ratios or different confining pressures are quantified by adopting different SWCCs. As a result, it is recommended that the measured SWCC from the conventional Tempe cell or pressure plate needs to be corrected by considering different stress levels in the estimation of the shear strength of unsaturated soil.

Translated title of the contributionEffect of the uncertainty in soil-water characteristic curve on the estimated shear strength of unsaturated soil
Original languageChinese (Traditional)
Pages (from-to)317-330
Number of pages14
JournalJournal of Zhejiang University: Science A
Volume21
Issue number4
DOIs
Publication statusPublished - Apr 1 2020
Externally publishedYes

Keywords

  • Confidence limits
  • P66
  • P67
  • Pore-size distribution function
  • Soil-water characteristic curve (SWCC)
  • TU42
  • Unsaturated shear strength
  • Variability

ASJC Scopus subject areas

  • Engineering(all)

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