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Example (Introduction to Geotechnical Engineering by Robert D. Holtz) Given: Soil profile 0 A brown silty sand fill 5 m thick was placed over a 15 m thick layer of compressible gray silty clay. Underlying the clay layer is brown sandy gravel. The soil profile is shown in Fig. Ex. 9.12a. Assume for this problem that the settlement of the fill and the sandy gravel is small compared to the Brown silty sand (SM) (fill) settlement of the silty clay layer. Properties of the normally consolidated silty clay layer are: GWT: 1.1. Initial void ratio, e, Compression index, C, 0.36. Gray -10 silty Secondary compression index, C = 0.06. Saturated density, Pat= 1.52 Mg/m³. clay (CL) Coefficient of consolidation, c, 0.858 m²/yr. The density of the silty sand fill, p, is 2.0 Mg/m³, and the ground water table is at the interface of the fill and clay, at - 5 m. Psa 1.52 Mg/m³ Required: Part I. Compute the consolidation settlement of the silty clay layer due to the weight of the 5 m of new fill, Part II. Compute the time rate of settlement. Part III. Compute and plot o'(z) when U = 50%. Part IV. Compute the secondary settlement. > Brown sandy gravel (GP) incompressible. 1000 Depth (m) -15 -20 -25

Example (Introduction to Geotechnical Engineering by Robert D. Holtz) Given: Soil profile 0 A brown silty sand fill 5 m thick was placed over a 15 m thick layer of compressible gray silty clay. Underlying the clay layer is brown sandy gravel. The soil profile is shown in Fig. Ex. 9.12a. Assume for this problem that the settlement of the fill and the sandy gravel is small compared to the Brown silty sand (SM) (fill) settlement of the silty clay layer. Properties of the normally consolidated silty clay layer are: GWT: 1.1. Initial void ratio, e, Compression index, C, 0.36. Gray -10 silty Secondary compression index, C = 0.06. Saturated density, Pat= 1.52 Mg/m³. clay (CL) Coefficient of consolidation, c, 0.858 m²/yr. The density of the silty sand fill, p, is 2.0 Mg/m³, and the ground water table is at the interface of the fill and clay, at - 5 m. Psa 1.52 Mg/m³ Required: Part I. Compute the consolidation settlement of the silty clay layer due to the weight of the 5 m of new fill, Part II. Compute the time rate of settlement. Part III. Compute and plot o'(z) when U = 50%. Part IV. Compute the secondary settlement. > Brown sandy gravel (GP) incompressible. 1000 Depth (m) -15 -20 -25

Fundamentals of Geotechnical Engineering (MindTap Course List)
Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN:9781305635180
Author:Braja M. Das, Nagaratnam Sivakugan
Publisher:Braja M. Das, Nagaratnam Sivakugan
Chapter9: Consolidation
Section: Chapter Questions
Problem 9.20CTP
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Geotechnical Engineering-2

Example (Introduction to Geotechnical Engineering by Robert D. Holtz) Given: Soil profile 0 A brown silty sand fill 5 m thick was placed over a 15 m thick layer of compressible gray silty clay. Underlying the clay layer is brown sandy gravel. The soil profile is shown in Fig. Ex. 9.12a. Assume for this problem that the settlement of the fill and the sandy gravel is small compared to the Brown silty sand (SM) (fill) settlement of the silty clay layer. Properties of the normally consolidated silty clay layer are: GWT Initial void ratio, e,= 1.1. Compression index, C, -0.36. Gray -10 silty Secondary compression index, C = 0.06. Saturated density, Pat= 1.52 Mg/m³. clay (CL) Coefficient of consolidation, c, 0.858 m²/yr. The density of the silty sand fill, p, is 2.0 Mg/m³, and the ground water table is at the interface of the fill and clay, at - 5 m. Psa 1.52 Mg/m³ Required: Part I. Compute the consolidation settlement of the silty clay layer due to the weight of the 5 m of new fill, Part II. Compute the time rate of settlement. Part III. Compute and plot o'(z) when U = 50%. Part IV. Compute the secondary settlement. > Brown sandy gravel (GP) incompressible 1000 Depth (m) -15 -20 -25
Transcribed Image Text:Example (Introduction to Geotechnical Engineering by Robert D. Holtz) Given: Soil profile 0 A brown silty sand fill 5 m thick was placed over a 15 m thick layer of compressible gray silty clay. Underlying the clay layer is brown sandy gravel. The soil profile is shown in Fig. Ex. 9.12a. Assume for this problem that the settlement of the fill and the sandy gravel is small compared to the Brown silty sand (SM) (fill) settlement of the silty clay layer. Properties of the normally consolidated silty clay layer are: GWT Initial void ratio, e,= 1.1. Compression index, C, -0.36. Gray -10 silty Secondary compression index, C = 0.06. Saturated density, Pat= 1.52 Mg/m³. clay (CL) Coefficient of consolidation, c, 0.858 m²/yr. The density of the silty sand fill, p, is 2.0 Mg/m³, and the ground water table is at the interface of the fill and clay, at - 5 m. Psa 1.52 Mg/m³ Required: Part I. Compute the consolidation settlement of the silty clay layer due to the weight of the 5 m of new fill, Part II. Compute the time rate of settlement. Part III. Compute and plot o'(z) when U = 50%. Part IV. Compute the secondary settlement. > Brown sandy gravel (GP) incompressible 1000 Depth (m) -15 -20 -25
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