For a normally consolidated clay layer in the field, the following values are given: • Thickness of clay layer = 8,5 ft • Void ratio (eo) = 0,8 Compression index (C.) = 0.28 • Average effective pressure on the clay layer (ob) = 2650 lb/ft • Ao' = 970 lb/ft? • Secondary compression index (C.) = 0.02 What is the total consolidation settlement of the clay layer five years after the completion of primary consolidation settlement? (Note: Time for completion of

For a normally consolidated clay layer in the field, the following values are given: • Thickness of clay layer = 8,5 ft • Void ratio (eo) = 0,8 Compression index (C.) = 0.28 • Average effective pressure on the clay layer (ob) = 2650 lb/ft • Ao' = 970 lb/ft? • Secondary compression index (C.) = 0.02 What is the total consolidation settlement of the clay layer five years after the completion of primary consolidation settlement? (Note: Time for completion of

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Calculation of Settlement

The vertical displacement of the structural foundation due to the loading from the superstructure is known as settlement. It is due to the reduction of air voids present in the soil. The amount of vertical displacement depends on the bearing capacity of the soil on which the foundation is laid. The effect of the settlement depends on the magnitude of settlement, uniformity, and the structural design of the structure. The maximum allowable settlement for residential and office buildings should be less than 18 mm, for industrial buildings, it is 38 mm and for commercial buildings, it is 25 mm.

Question

For a normally consolidated clay layer in the field, the following values are given:
• Thickness of clay layer = 8,5 ft
• Void ratio (eo) = 0,8
Compression index (C.) = 0.28
• Average effective pressure on the clay layer (ob) = 2650 lb/ft
• Ao' = 970 lb/ft?
• Secondary compression index (C.) = 0.02
What is the total consolidation settlement of the clay layer five years after the
completion of primary consolidation settlement? (Note: Time for completion of

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The figure below shows the soil profile at a site where you plan to lower the water table. You have results from two consolidation tests, one from the upper 12 ft thick overconsolidated crust, and another from the lower 40 ft thick normally consolidated zone. You plan to lower the water table from its current 12 ft depth to 25 ft below ground surface. The consolidation properties for each layer are shown. (Assume that changes in GWT do not affect γt of clay). a. Compute the σ′v in the middle of each layer before and after the water table is lowered b. Determine the total settlement that will result from lowering the water table
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Q: For the soil profile shown in figure. Determine the: a) Final consolidation settlement. b) Time (in month) required for 50% consolidation. c) Time (in month) required for the settlement to be (32) mm. d) Effective stress at the mid of the clay layer immediately after applying the load. e) Pore water pressure at the mid of the clay at the end of consolidation. f) Time (in month) required for full consolidation. g) value of maximum preconsolidation pressure (õp)at which the clay is considered as normally consolidated clay. Note: use yw= 10 kN/m³ Surcharge Aq.= 60 kPa El. 0 XXX Sand y= 15 kN/m³ El. -3 m Sand y= 17 kN/ m³ El. -6 m Clay Y. = 19.5 kN/m³ e = 0.81 C, = 1.5 m²/ yr O.C.R =1.6 C. = 0.15 C, = 0.02 El. -10 m Sand
Q2-A) A normally consolidated clay layer is 5 m thick (one-way drainage). From the application of a given pressure, the total anticipated primary consolidation settlement will be 160 mm. a. What is the average degree of consolidation for the clay layer when the settlement is 50 mm? b. If the average value of c, for the pressure range is 0.003 cm²/sec, how long will it take for 50% settlement to occur? c. How long will it take for 50% consolidation to occur if the clay layer is drained at both top and bottom?
A 3m deep sand layer has a specific gravity of 2.68 and a void ratioof 0.60. Under this layer is a 2.5m deep clay profile with a specific gravity of 2.7 and a moisture content of 30%. The water table is observed at 1m below the ground surface. Determine the compression index of a normally consolidated clay after the surcharge of 75kPa. Clay is observed to have a void ratio of 0.40 after the surcharge. (Assume unit weight of soil profile above the clay layer is the same when the soil was not subjected to surcharge load).
For a normally consolidated clay layer in the field, the following values are given: Thickness of clay layer = 8.5 ft ● Void ratio = 0.8 ● ● ● ● Compression index (CC) = 0.28 Average effective pressure on the clay layer is 2650 lb/ft² Additional Overburden Pressure is 970 lb/ft² Secondary compression index (Ca) is 0.02 Determine the total consolidation settlement considering primary and secondary settlement. Select the correct response: 2.6425" 2.5631" 2.8866" 2.3856"