Discussion of “Influence of relative compaction on the hydraulic conductivity of completely decomposed granite in Hong Kong”Appears in Canadian Geotechnical Journal, 46(10): 1229–1235.

2010 ◽  
Vol 47 (6) ◽  
pp. 704-707 ◽  
Author(s):  
Robert P. Chapuis ◽  
Michel Aubertin
Keyword(s):  
Hong Kong ◽  
Hydraulic Conductivity ◽  
Relative Compaction ◽  
Decomposed Granite ◽  
Completely Decomposed Granite

Influence of relative compaction on the hydraulic conductivity of completely decomposed granite in Hong Kong

2009 ◽  
Vol 46 (10) ◽  
pp. 1229-1235 ◽  
Author(s):  
Jian-Hua Yin
Keyword(s):  
Experimental Study ◽  
Hong Kong ◽  
Hydraulic Conductivity ◽  
Void Ratio ◽  
Technical Note ◽  
Relative Compaction ◽  
Decomposed Granite ◽  
Relationship Of ◽  
The Relationship ◽  
Completely Decomposed Granite

The relative compaction (RC) parameter is commonly used for assessment of the degree of compaction of existing fill slopes and (or) for the design and construction of new fill slopes. This technical note presents the results of an experimental study on the relationship of RC with the saturated hydraulic conductivity (ksat) of typical completely decomposed granite (CDG) in Hong Kong. The results are interpreted and discussed. Useful correlations of RC versus ksat and void ratio (e) versus ksat are obtained. It is found that the RC has a significant influence on ksat of CDG. The influence of RC is equivalent to the influence of e on ksat of the soil.

Shear strength and dilative characteristics of an unsaturated compacted completely decomposed granite soil

2010 ◽  
Vol 47 (10) ◽  
pp. 1112-1126 ◽  
Author(s):  
Md. Akhtar Hossain ◽  
Jian-Hua Yin
Keyword(s):  
Shear Strength ◽  
Normal Stress ◽  
Matric Suction ◽  
Water Retention Curve ◽  
Direct Shear ◽  
Normal Stresses ◽  
Soil Water Retention Curve ◽  
Strength Data ◽  
Decomposed Granite ◽  
Completely Decomposed Granite

Shear strength and dilative characteristics of a re-compacted completely decomposed granite (CDG) soil are studied by performing a series of single-stage consolidated drained direct shear tests under different matric suctions and net normal stresses. The axis-translation technique is applied to control the pore-water and pore-air pressures. A soil-water retention curve (SWRC) is obtained for the CDG soil from the equilibrium water content corresponding to each applied matric suction value for zero net normal stress using a modified direct shear apparatus. Shear strength increases with matric suction and net normal stress, and the failure envelope is observed to be linear. The apparent angle of internal friction and cohesion intercept increase with matric suction. A greater dilation angle is found at higher suctions with lower net normal stresses, while lower or zero dilation angles are observed under higher net normal stresses with lower suctions, also at a saturated condition. Experimental shear strength data are compared with the analytical shear strength results obtained from a previously modified model considering the SWRC, effective shear strength parameters, and analytical dilation angles. The experimental shear strength data are slightly higher than the analytical results under higher net normal stresses in a higher suction range.

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