Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 17, Problem 22P
To determine
The depths of the different strata of soil and the type of soil in each stratum.
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Question 5An earth dam is proposed for a site consisting of a homogeneous stiff clay, as shown in the Fig. below. You, the geotechnical engineer, are required to specify soil strength tests to determine the stability of the dam. One of the critical situations is the possible failure of the dam by a rotational slip plane in the stiff clay. What laboratory strength tests would you specify and why?Question 5
An earth dam is proposed for a site consisting of a homogeneous stiff clay, as shown in the Fig. below. You,
the geotechnical engineer, are required to specify soil strength tests to determine the stability of the dam. One
of the critical situations is the possible failure of the dam by a rotational slip plane in the stiff clay. What
laboratory strength tests would you specify and why?
A plate-bearing test is performed on soil near the surface of a granular stratum in order to determine the modulus of vertical subgrade reaction. The load versus settlement information appears as a straight line on a graphical plot. At a point where the load is 5 tons/ft2, the indicated settlement is 0.5 in. What is the value for the modulus of vertical subgrade reaction?
Three samples of Soil were collected during soil exploration for the construction of a Highrise Building. a) Choose the most appropriate Test to determine shear strength parameters for each of the sample described as under i) Saturated Plastic Clay ii) Well Graded Sand iii) Silty Clay b) Draw typical graph between shear stress and normal stress for each of the sample described as above.
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- From the given data determine these soil properties and analyse the results, how important are these test data and how can they be integrated within geotechnical design procedures. - If a soil sample tested in a direct shear box of 60 mm by 60 mm and the maximum readings for normal loads of 0.3, 0.5 and 1.0kN were 202, 265 and 511 kN, determine the strength parameters corresponding to effective stress.arrow_forwardDescribe about the Results of direct shear tests on samples of a homogeneous soil.arrow_forwardDiscuss how the analysis of sediment can be used in environmental reconstructions.arrow_forward
- A materials supplier presented the following values for a sample of their CBR tests for subgrade soil. What mean absolute deviation (MD) for the results. 4.1 4.3 4.5 4.7 4.9 4 3 2 CBR Frequency 1 2 4.55 O 2.33 0.19 O 0.21arrow_forwardYou are given the results of index testing (i.e., Atterberg Limits; ASTM D422 and D4318) of two soil samples collected during a recent geotechnical exploration. The index test results are presented in Figure B. The first sample was taken between depths of 1.5 ft to 2.5 ft below the existing ground surface. The second sample was taken between depths of 6.5 ft to 7.5 ft below the existing ground surface. The groundwater table, at the time of the geotechnical exploration, was at a depth of 4.0 ft from the existing ground surface. Classify the soil of one sample only (either Sample #1 or Sample #2) in accordance with USCS (give group symbol and group name). #30 #40 60 #100 #200 100 Sample #1 - Depth Range 1.5 ft to 2.5 t Sample #2 - Depth Range 6.5 ft to 7.5 t Line/Scatter Plot 13 06 80 Atterberg Limits Results: Sample #1: LL = 34, PL 21 Sample #2. LL = 70, PL = 50 60 30 20 10 60100 200 0.1 D=0.085 mm Particle Diameter (mm) #10 10 0.01 0.001 D-0 82 mm Dy=0.395 mm Figure B. Grain Size…arrow_forwardThe results obtained from a seismic study along a section of the centreline of a highway are shown below. estimate the depths of the different strata of soil and suggest the type of soil in each stratum. Distance of impulse to Geophone Time for Wave Arrival ( 10-3 sec ) 7.5 20 15 40 22.5 60 30 68 37.5 74 45 82 52.5 84 60 86 67.5 88 75 90arrow_forward
- In an ongoing land development project, a Contractor requested for a concrete pouring request. After conducting a field density test in Road Lot 1 and 2, the results of Sand Cone Method (Ysand = 16.353 kN/m³) are as follows: Weight of Soil Sample (kg) 1.39 Total Weight of Retained Mass Sand Location Moisture of Sand Content (%) (kg) (kg) 6.2 Road Lot 1 20% 19% 7.40 Road Lot 2 7.40 6.3 1.30 Properties of Soil base on Soil Investigation Result: Weight of Soil Sammple - 1.631 kg Volume of Soil Sample – 0.0008 cu.m. Determine the following: a. Maximum dry unit weight (kn/m^3) of soil sample if optimum moisture content is 22% b. As Civil Engineer, will you allow concrete pouring in Road Lot 1 base on FDT result? (Relative compaction should be equal or higher than 95%) c. As Civil Engineer, will you allow concrete pouring in Road Lot 2 base on FDT result? (Relative compaction should be equal or higher than 95%)arrow_forwardCone penetrometer soundings were used for the subsurface investigation of a planned construction site. At one sounding location, the value recorded for qc at a depth of 21 feet was 150 ksf. The soil has a unit weight of 115 pcf. Using criteria that relate CPT results and the soil angle of internal friction, estimate the value of f for the sand at the test depth (known from borings).arrow_forwardIn a container filled with each of the following materials, at a porosity of 40%, determine the upward gradient required to cause quick condition sand with a specific gravity of 11.35. a.0.99 b. 0.255 c. 0.33 d. 6.21arrow_forward
- Considering broad categories of soil types and commonly used soil sampling tools, please answer the following questions. What type of sampler is used to sample granular soils for Choose... laboratory testing? What type of sampler is used to sample cohesive soils for v Choose... laboratory testing? Thin-walled or Shelby tube sampler Split-barrel or split- spoon sampler Electric cone Split-spoon tesing er penetrometer onarrow_forward(3) A direct shear test is used to find the shear strength of a soil. For two soil samples, the vertical stresses are 100 kPa and 300 kPa, and the corresponding shear stresses at failure are 57.7 kPa and 173.2 kPa, respectively. Please determine the strength parameters of this soil. 18 L marrow_forwardIgnoring the given Es-data and considering that the supporting soil is clean, normally consolidated sand with the following available data:arrow_forward
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