2) In an embankment dam construction project, dam body consists of an inner clay part and outer rockfill. Which test do you prefer for the following situations, respectively: 1. Before collecting water in reservoir, evaluate the short term slope stability analysis of the clay core. II. One year after collecting water in reservoir, you need to drop the water level due to an earthquake. Evaluate the slope stability of the clay core O a. Direct Shear Test-Falling Head Test O b. Direct Shear Test- Consolidated Undrained Test O . Unconsolidated Undrained Test-Consolidated Drained Tes O d. Vane Shear Test-Direct Shear Test O e. Consolidated Drained Test -Consolidated Undrained Test

2) In an embankment dam construction project, dam body consists of an inner clay part and outer rockfill. Which test do you prefer for the following situations, respectively: 1. Before collecting water in reservoir, evaluate the short term slope stability analysis of the clay core. II. One year after collecting water in reservoir, you need to drop the water level due to an earthquake. Evaluate the slope stability of the clay core O a. Direct Shear Test-Falling Head Test O b. Direct Shear Test- Consolidated Undrained Test O . Unconsolidated Undrained Test-Consolidated Drained Tes O d. Vane Shear Test-Direct Shear Test O e. Consolidated Drained Test -Consolidated Undrained Test

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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A borehole. A clay layer is discovered 7m below a sandy soil. The groundwater table of the area is 10m below the natural grade line. The sandy soil has a unit weight of the clay layer is 22.3 kn/m3 , and the moisture content and specific gravity is 12.4% and 2.7, respectively. A. Find the driend unit weight of the clay layer B. Find the total stress on a point 13m below the natural grade line. C. The effective stress at a point 10m below the grade line. D. Find the effective stress 13m below the natural grade line if there is a ground water drawdown of 4.5m due to groundwater extraction
consolidated drained triaxial test was conducted on a granular soil. At failure (σ1^')/(σ3^' ) = 4.0. The effective minor principal stress at failure was 100 kN/m2. Compute angle of friction^' in degrees. a. 39 b. 41 c. 37 d. 35
A consolidated drained tri-axial test was conducted on normally consolidated clay. The results were: the confining pressure is 300 kPa and the deviators stress is 300 kPa. Compute the angle of shearing resistance. a. 16.3 b. 54.74 c. 19.47 d. 24.72
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In a site reclamation project, 2.5 m of graded fill (y=22KN/m³) were laid in the compacted layers over an existing layer of silty clay (y= 18 KN/m³) which has 3 m thick. This was underlain by a 2 m thick layer of gravel (y=20 KN/m³). Assuming the water table remains at the surface of silty clay draw the effective stress profiles for case after the fill has been placed.
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In a tri – axial test, a sample of saturated sand was consolidated under an all around pressure of 80 kPa. During the addition of vertical load, drainage was prevented and the pore water pressure was measured to be 30 kPa. The added vertical pressure at that time was 120 kPa. Compute the drained angle of friction. a. 43.06 degreesb. 53.16 degreesc. 33.06 degreesd. 23.26 degrees
The figure below shows the soil profile at a construction project site. A soil sample was obtained from location B (depth = 19.0m). A consolidation test was performed on the soil sample. The idealized e-log o' plot from the consolidation test is shown on the right-hand side. The current vertical effective stress, o' z0 =198kPa. (1) y = 18.3 kN/m 2.0m I4.0 A 7.0 m Y = 19.0 kN/m3 Stiff Silty Clay (CL) - C. 10.0 18.0 m y = 19.5 kN/m3 log o' Very Stiff Clay (CL) Point o' (kPa) e A 510 0.38 44 2100 Glacial Till 320 0.31 Fill in the blanks with appropriate answers: Pre-consolidation stress at sample depth (kPa) = No decimals needed Based on the o'z0 value provided, determine if the "Very Stiff Clay" is Normally-Consolidated or Over-Consolidated. "Very Stiff Clay" is Fill in NC or OC. Over-consolidation margin (kPa) = No decimals needed (Show work in hand-calc sheet) %3D Re-compression Index = Report to 3 decimals (Show work in hand-calc sheet)
i. The following information is collected from rock coring process in which the total core advance was 65 cm. Core Recovery (cm) 20 7 Calculate: 11. a) The total core recovery b) The core recovery ratio c) The rock quality designation d) State the rock mass quality 6 10 16 A shear vane of length 150 mm and diameter 50 mm was used to measure the shear strength of saturated clay. The torque required at failure of the clay was 50 N-m. a) Assuming a triangular stress distribution along the vane ends, estimate the shear strength of the clay in kPa. b) On this clay, how deep can excavation advance without lateral support? Assume y= 18 kN/m³.
4. At the stage of secondary consolidation settlement, the excess porewater pressure becomes equal to 5. The preconsolidation pressure split the e-loga' curve into two portions: and
You have been assigned to check the stability of a pond constructed in stiff saturated clay underlain by a layer of sand. The necessary information are given in the following figure. (i) Find effective stress at and determine the stability of cut under given condition. (ii) What should be water level into the pond to ensure factor of safety = 1. (Given that yw = 9.81 kN/m³) H = 5 m 7m KE T 3 m 2 m ↓ Saturated clay Sand Ysat 18 kN/m³ 6.5 m Ysat = 15 kN/m³