Vol16 No.7: 1661-1674
【Title】Compression characteristics of saturated re-compacted glacial tills in Tianmo Gully of Tibet, China
【Author】CHEN Lei-lei1,2; ZHOUGordon G. D.1,2*; MU Qing-yi3; CUI Kahlil Fredrick E.1,2; SONGDong-ri1,2
【Addresses】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
【Corresponding author】ZHOU Gordon G. D
【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
【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) 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