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Analysis of Swelling and Shrinkage Behavior of Compacted Clays 总被引:2,自引:0,他引:2
Anil Kumar Mishra Sarita Dhawan Sudhakar M. Rao 《Geotechnical and Geological Engineering》2008,26(3):289-298
The impact of the variation in compaction condition on the swelling and shrinkage behavior of three soils has been examined.
Two natural soils, namely red soil and black cotton soil, and one artificially mixed soil sample of commercial bentonite with
well-graded sand, were studied. Compaction curve for Standard Proctor conditions were plotted and four compaction conditions
were selected. Experimental results showed that clay mineralogy dominates over compaction conditions in influencing the swelling
and shrinkage behavior of the tested soils. Monitoring of void ratio (e)−water content (w) relations during shrinkage showed
that soil specimens generally shrunk in three distinct linear stages. A small reduction in void ratio occurred on reduction
in water content during the first shrinkage stage and was termed as initial shrinkage. In second stage, void ratio decreased
rapidly with reduction in water content and was termed as primary shrinkage. In third and final stage, reduction in water
content is accompanied by a marginal change in void ratio and it’s called residual shrinkage. Irrespective of initial compaction
conditions studied, the transition from primary to residual shrinkage for all the specimens occurred within a narrow range
of water content (10–15%). 相似文献
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Hadi Sanikhani Ozgur Kisi Rasoul Mirabbasi Sarita Gajbhiye Meshram 《Arabian Journal of Geosciences》2018,11(15):437
In the present study, trends of rainfall of the Central India were evaluated in monthly, seasonal, and annual time scales using the Revised Mann-Kendall (RMK) test, Sen’s slope estimator, and innovative trend method (ITM). For this purpose, the monthly rainfall data for 20 stations in Madhya Pradesh (MP) and Chhattisgarh (CG) states in Central India during 1901–2010 was used. The Sen’s slope estimator was utilized for calculating the slope of rainfall trend line. Based on the obtained results of RMK test, there is no significant trend in the stations for the January and October months. The results also showed that for MP, two out of 15 considered stations indicate significant annual trend, while the CG has four out of five stations with significant trend. The results of applying ITM test indicated that most of the stations have decreasing trends in annual (16 stations), summer (16 stations), and monsoon (11 stations) seasons, while the winter (12 stations) and post monsoon (11 stations) seasons generally show increasing trend. Unlike the RMK, the ITM shows significant increasing trend in rainfall of November and December months. The finding of current study can be used for irrigation and water resource management purpose over the Central India. 相似文献