Consolidation Rate Chapter 9 Consolidation Model 1 4/2/2015 - PDF document

4/2/2015 Consolidation Rate Chapter 9 Consolidation Model 1

4/2/2015 Consolidation Rate �� � �� �� �� �� � �� � � � � � 1 �� �� � � �� � � 1 � � � �� Coefficient of compressibility � � � �� ��′ (Holtz & Kovacs, An Introduction to Geotechnical Engineering , 1981) 2

4/2/2015 Coefficient of Compressibility 1.5 1.4 1.3 Void ratio, e 1.2 1.1 1  ' 0  ‘ f 0.9 0.8 10 100 1000 Effective pressure  ' (kPa) Coefficient of Compressibility 1.5 1.4 1.3 Void ratio, e 1.2 1.1  ‘ f 1  ' 0 0.9 0.8 0 100 200 300 400 500 600 700 Effective pressure  ' (kPa) 3

4/2/2015 Coefficient of Compressibility 0.0016 0.0014 0.0012 0.001 a v 0.0008 0.0006  ‘ f 0.0004  ' 0 0.0002 0 0 100 200 300 400 500 600 Effective pressure  ' (kPa) Consolidation Rate � � � � � � �� � � � �� �� � � �� � � � � � 1 � � � �� �� � 4

4/2/2015 Coefficient of volume change � � � ∆� � ∆�′ �� (Holtz & Kovacs, An Introduction to Geotechnical Engineering , 1981) Consolidation Rate c t  T v z 2 H d r 2 H dr 5

4/2/2015 Consolidation Rate u z � � � 2 2� � 1 c t  T v z 2 H dr u 0 = initial excess pore pressure Degree of Consolidation 6

4/2/2015 Average Degree of Consolidation Average Degree of Consolidation Settlement (feet) S p Time (years) 7

4/2/2015 Average Degree of Consolidation 8