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Journal of Mountain Science

, Volume 16, Issue 7, pp 1661–1674 | Cite as

Compression characteristics of saturated re-compacted glacial tills in Tianmo Gully of Tibet, China

  • Lei-lei Chen
  • Gordon G. D. ZhouEmail author
  • Qing-yi Mu
  • Kahlil Fredrick E. Cui
  • Dong-ri Song
Article
  • 10 Downloads

Abstract

Glacial tills are highly compressible soils composed of loosely cemented sandy silt particles. Their role, for instance, as initial filler materials in geo-technical projects along temperate glacier regions warrant a systematic evaluation of their compressive characteristics. As such, we carry out a series of one-dimensional compression tests on re-compacted glacial till samples obtained from Tianmo Gully, Tibet, with the aims of evaluating their compressive behavior under controlled initial stress conditions. The yield stress was determined from the void ratio versus consolidation pressure (e-log σv) planes. Its compression and swelling behaviors were observed during the primary and secondary compressions of the consolidation tests. From the compression curves, a correlation can be found between the consolidation stress and the void index. In addition, we find that the compression curves of glacial tills collapse into a single curve when normalized by the compression index. The experimental results in this study provide a basic understanding of the compression characteristics of the glacial tills in Tibet, China.

Keywords

Glacial till Compression characteristics One-dimensional consolidation tests Consolidation stress Compression curve 

En|Notation

Cu

Uniformity coefficient

Cc

Coefficient of curvature, Compression index

Cα

Coefficient of secondary compression

d10

Effective diameter

d30

Continuous diameter

d50

Average diameter

d60

Constrained diameter

e

Void ratio

ec

After consolidation void ratio

e100

Void ratio on intrinsic compression under vertical consolidation stress 100 kPa

e1000

Void ratio on intrinsic compression under vertical consolidation stress 1000 kPa

Gs

Specific gravity

Ip

Plastic index

Iv

Void index

Sr

Degree of saturation

w

Water content

WL

Liquid limit

Wp

Plastic limit

ρd

Dry density

σv

Compression pressure

σ′v

Effective compression pressure

σy

Yield stress

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Notes

Acknowledgements

The authors acknowledge the financial support from the Key Research Program of Frontier Sciences, Chinese Academy of Sciences (Grant no. QYZDB-SSW-DQC010) and the Youth Innovation Promotion Association, Chinese Academy of Sciences.

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Copyright information

© Science Press, Institute of Mountain Hazards and Environment, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Key Laboratory of Mountain Hazards and Earth Surface Process, Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengduChina
  2. 2.University of Chinese Academy of SciencesBeijingChina
  3. 3.Department of Civil EngineeringXi’an Jiaotong UniversityXi’anChina

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