Choose the correct answer Q3/A- Choose the correct answer1. Subsurface exploration is necessary for(a) selecting the type and depth of foundation for a given structure.(b) evaluating the load-bearing capacity of the foundation.(c) estimating the probable settlement of the foundation.(d) all of the above.2. The approximate spacing of boreholes for highway projects is(a) 10 – 30 m. (b) 20 – 60 m. (c) 40 – 80 m. (d) 250 – 500 m.3. Which of the following is the simplest method of making exploratory boreholes?(a) Auger boring (b) Wash boring (c) Percussion drilling (d) Rotary drilling4. Disturbed soil samples cannot be used for(a) grain-size analysis. (b) specific gravity of soil solids. (c) classification.(d) hydraulic conductivity.3. The soil sample collected by a sampler is generally considered to be undisturbed when thearea ratio is(a) less than 10%. (b) equal to or less than 10%. (c) greater than 10%.(2) e9ual to or greater tham lo0 %. 6. The split-spoon samples are generally taken at intervals of about(a) 0.5 m. (b) 1.0 m. (c) 1.5 m. (d) 3.0 m.7. If the numbers of blows required for the penetration of a split-spoon sampler into the soildeposit for three 152.4-mm consecutive intervals are 8, 12 and 10, the standardpenetration number (N) will be(a) 18. (b) 20. (c) 22. (d) 30.8. Which of the following field tests does not require a borehole?(a) Cone penetration test (CPT) (b) Standard penetration test (SPT)(c) Pressuremeter test (PMT) (d) All of the above9. After completion of the boring in a highly permeable soil deposit, the level of water in theborehole generally stabilizes in(a) 1 h. (b) 24 h. (c) 1 week. (d) more than one week.10. The standard penetration number measured in the field is required to be corrected for(a) hammer efficiency. (b) borehole diameter and rod-length. (c) sampling method.(d) all of the above.

1: subsurface exploration is necessary to determine: position of ground water table prediction of…

Q3/A- Choose the correct answer 1. Subsurface exploration is necessary for (a) selecting the type and depth of foundation for a given structure. (b) evaluating the load-bearing capacity of the foundation. (c) estimating the probable settlement of the foundation. (d) all of the above. 2. The approximate spacing of boreholes for highway projects is (a) 10 - 30 m. (b) 20 – 60 m. (c) 40 - 80 m. (d) 250 – 500 m. 3. Which of the following is the simplest method of making exploratory boreholes? (a) Auger boring (b) Wash boring (c) Percussion drilling (d) Rotary drilling 4 Disturhed soil san

Q3/A- Choose the correct answer 1. Subsurface exploration is necessary for (a) selecting the type and depth of foundation for a given structure. (b) evaluating the load-bearing capacity of the foundation. (c) estimating the probable settlement of the foundation. (d) all of the above. 2. The approximate spacing of boreholes for highway projects is (a) 10 - 30 m. (b) 20 – 60 m. (c) 40 - 80 m. (d) 250 – 500 m. 3. Which of the following is the simplest method of making exploratory boreholes? (a) Auger boring (b) Wash boring (c) Percussion drilling (d) Rotary drilling 4 Disturhed soil san

Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN:9781337705028

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter7: Ultimate Bearing Capacity Of Shallow Foundations: Special Cases

Section: Chapter Questions

Problem 7.16P

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The figure below shows a proposed foundation site, with 10 ft of sand overlying 20 ft of clay with consolidation properties shown. The clay is normally consolidated. Assume 1-D conditions.a. Compute the initial σ′v at the middle of the clay layer prior to excavation and constructionb. After excavation and during construction, the foundation area will be heavily loaded with the structure and equipment so that σ′v at the middle of the clay layer will be increased to 3900 psf. Determine the settlement that will occur under these conditionsc. After construction is completed, the equipment will be removed and the final σ′v at the middle of the clay layer will be 3200 psf. Compute the swell that occurs after the equipment is removed
A shallow square foundation for a column is to be constructed. It must carry a net vertical load of 1000 kN. The soil supporting the foundation is sand. The standard penetration numbers (N60) obtained from field exploration are as follows: FIG. 17.15 The groundwater table is located at a depth of 12 m. The unit weight of soil above the water table is 15.7 kN/m3, and the saturated unit weight of soil below the water table is 18.8 kN/m3. Assume that the depth of the foundation will be 1.5 m and the tolerable settlement is 25 mm. Determine the size of the foundation.
Q-1: The subsoil profile of a proposed site of construction is shown below, a square footing of 2m x 2m carries a load of 1000 kN and is laid with its base at 1m depth below ground surface assuming that post construction settlement in sand is negligble determine the consolidation settlement of clay layer on account of construction. There is geological evidence, clay is NC, use 2 vertical and 1 horizontal for load dispression to estimate the stress increase in clay layer. 1000 KN 2m 2 m 3 m 1m 7 W₁ = 40% G = 2.7 W₁ = 60% Rock Soil Profile Sand y = 16 kN/m³ Sand Y = 20 kN/m³ Clay Y = 19 kN/m³ W.T
A footing of 3m x 3m size transmits a load of 1800 KN. The angle of load dispersion in soil is tan-3 0.5. What is the stress created by the footing load at a depth of 5m? *
The following results were obtained from CU tests on a clay soil that is the foundation material for an embankment. 03 (kPa) 300 400 600 0₁-03 (kPa) 331 420 487 Au (kPa) 111 160 322 (a) Determine the total and effective principal stresses for all three tests (You may summarize them in a table). (b) Recommend the shear strength parameters to be used for short-term and long-term analyses. The maximum confining pressure (cell pressure) at the depth of interest is 300 kPa. (Note: the clay is a normally consolidated one).
Problem #59 The subsoil profile of a proposed site of construction is shown below, a square footing of 2m x 2m carries a load of 1000 kN and is laid with its base at lm depth below ground surface assuming that post construction settlement in sand is negligible determine the consolidation settlement of clay layer on account of construction. There is geological evidence, clay is NC, use 2 vertical and 1 horizontal for load dispersion to estimate the stress increase in clay layer. 1000 KN Sand Y 16 kN/m³ 2 m W.T Wn = 40% GS = 2.7 W₁ = 60% Rock Soil Profile 2 m 3 m [Answer = 86.199mm] Sand Y = 20 kN/m³ Clay y 19 kN/m³
5. Soil exploration was conducted at a site in Greater Noida for the determination of bearing capacity of a square raft foundation of size 20 m to be placed at a depth of 4.5 m below the ground surface. SPT data of a borehole has been given in Table 1. Water table has been encountered at 6 m below the ground surface. Find out the corresponding corrected value of SPT resistance. Assume Ybulk = 18.5 kN/m³. Table 1 Depth below ground surface (m) IS classification Nobs ML (NP) SM (NP) 1.5 9 3.0 10 4.5 SP-SM 15 6.0 SP-SM 18 7.5 SP-SM 34 9.0 SP 56 10.5 SP 51 12.0 SM (NP) 77 13.5 SP 55 15.0 SP-SM 76 18.0 ML 80 21.0 SP-SM 81 24.0 SP 90 27.0 CL 86 30.0 CI 45 33.0 SM (NP) 62
1. Using the boring log shown below determine the ultimate bearing capacity of a rectangular footing having a width of 4 feet and a length of 8 feet. Standard Penetration Tests were conducted at 5 foot intervals. The depth of footing will be 3 feet below the ground surface. Project Name: Johnson Hall Location: Birmingham, Alabama Boring No.: В-2 Date: January 4, 2019 Surface Elev.: 357 ft Depth (ft) Moisture N No. qu (tsf) Description 4 inches of top soil (%) Comments y = 120 pcf Reddish Brown silty Clay 14 1.2 LL = 43 PI = 20 $ = 7° 10 Dark Reddish Brown silty Clay 15 22 1.3 15 15 21 1.6 GNE Boring Terminated at 15 feet Boring Checked after 24 hours N - Standard Penetration Test Number LL – Liquid Limit qu – Unconfined Compression Strength $ - Angle of Internal Friction PI – Plastic Index GNE – Groundwater Not Encountered 20
A 1.8 m square, 2 m deep and 1 m high footing supports a column load of 570 kN. It is supported on a clayey sand. There is no water present at the site. Use unit weight for the concrete 24 kN/m³. A dilatometer test run at the site has returned the following constrained modulus profile: Depth (m) M (MPa) 2 E 7.7 3 8.8 Calculate the settlement using Schmertman's method for the period after 50 years. Soil unit weight is 21 kN/m³. Use the correlation between elastic and constrained modulus of soil with Poisson's ration 0.33: (1 + v)(1-2v) (1 − v) 4 5 10.2 14.8 M 6 15.4
: A footing is to be constructed 1.8 m below the ground surface as shown in figure 4(d). The base of the footing is 2.7 m x 2.7 m and it carries a total load of 1800 kN which includes the column load and weight of the footing. Compute the total expected settlement of the footing (consider only consolidation settlement) : 1.8 m 2.7 m Sand and Gravel Y = 20.2 kN/m 2.7 m V WT bni Normally consolidated Clay e, = 1.2 Cc = 0.7 2.7 m Sand and Gravel
1- Depth of B.H ==> depth of borehole 2- Bearing capacity for the soil under the footing. ==> hansen equation 3- Immediate settlement for the soil under footing. ==> Si 4- Find the time required for 100% degree of consolidation
A square footing 5 ft by 5 ft supported on a sandy stratum is designed to carry a column loading of 250,000 lb. The unit weight of the sands underlying the footing location vary between 120 and 125 pcf. Estimate the foundation settlement to be expected using the subgrade reaction method. (Neglect the weight of the footing.)