JpGU-AGU Joint Meeting 2017

講演情報

[EE] ポスター発表

セッション記号 A (大気水圏科学) » A-GE 地質環境・土壌環境

[A-GE40] [EE] エネルギ・環境・水ネクサスと持続的発展

2017年5月22日(月) 10:45 〜 12:15 ポスター会場 (国際展示場 7ホール)

コンビーナ:張 銘(産業技術総合研究所地質調査総合センター地圏資源環境研究部門)、薛 強(中国科学院武漢岩土力学研究所)、温 志超(国立曇林科技大学)、川本 健(埼玉大学大学院理工学研究科)

[AGE40-P14] Study on the Compacted Clay Line Shrinkage Crack Characteristics and Crack Soil Representative Elementary Volume

*Wan Yong1Xue Qiang1Liu Lei1Zhao Li-ye1Zeng Gang1 (1.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences)

The shrinkage cracking is a main reason causing of compacted clay liner (CCL) anti-seepage failure in a landfill final cover. In this paper, six soils with different liquid limit (LL) were obtained by combining two natural soils, and the cracking characteristics and representative elementary volume (REV) size were studied by large scale model experiments. The results show that: With 50% liquid limit is bounded, there has a piecewise linear relationship between crack characteristic parameters (i.e. crack rate and crack length) and soil liquid limit, and the slope at LL<50 % is bigger than the slope at LL>50 %. The crack elementary volume (CEV) size of CCLs all accord with normal distribution, which the expectation and the mean square error linearly reduce with the increase LL when LL<50 %, while those change is not obvious when LL<50 %. The REV size decrease linearly with increase soil LL (REV=90.5-1.6LL) for low quid limit soil, while the change of the REV size is non-significant and it is approximately equal to 10 cm for high liquid limit soil.