Compression characteristics of saturated re-compacted glacial tills in Tianmo Gully of Tibet, China
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http://jms.imde.ac.cn https://doi.org/10.1007/s11629-018-5313-7
Compression characteristics of saturated re-compacted glacial tills in Tianmo Gully of Tibet, China CHEN Lei-lei1,2
https://orcid.org/0000-0001-9849-0463; e-mail: [email protected]
ZHOU Gordon G. D.1,2* MU Qing-yi 3
https://orcid.org/0000-0001-9014-2931;
e-mail: [email protected]
https://orcid.org/0000-0002-9235-4978; e-mail: [email protected]
CUI Kahlil Fredrick E.1,2 SONG Dong-ri1,2
https://orcid.org/0000-0002-4249-0330; e-mail: [email protected]
https://orcid.org/0000-0001-6892-9770; e-mail: [email protected]
* Corresponding author 1 Key Laboratory of Mountain Hazards and Earth Surface Process, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China 2 University of Chinese Academy of Sciences, Beijing 100049, China 3 Department of Civil Engineering, Xi'an Jiaotong University, Xi'an 710049, China Citation: Chen LL, Zhou GD, Mu QY, et al. (2019) Compression characteristics of saturated re-compacted glacial tills in Tianmo Gully of Tibet, China. Compression characteristics of saturated re-compacted glacial tills in Tianmo Gully of Tibet, China. Journal of Mountain Science 16(7). https://doi.org/10.1007/s11629-018-5313-7
© Science Press, Institute of Mountain Hazards and Environment, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2019
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 onedimensional 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 ) 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 Received: 26-Nov-2018 Revised: 21-Feb-2019 Accepted: 29-Apr-2019
characteristics of the glacial tills in Tibet, China. Keywords: Glacial till; Compression characteristics; One-dimensional consolidation tests; Consolidation stress; Compression curve
Notation
e
Uniformity coefficient Coefficient of curvature, Compression index Coefficient of secondary compression Effective diameter Continuous diameter Average diameter Constrained diameter Void ratio After consolidation void ratio Void ratio on intrinsic compression under vertical consolidation stress 100 kPa
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