a. Exploration boreholes on site show a horizontal water table at a depth of 4.5 metres. The borelog information is given in Table 2 (QB2). Calculate the total, effective and pore water pressure values at the base of each layer in kN/m2. (Take the unit weight of water as 9.81KN/m3). Please used the customised bulk density values in your calculation. The customised bulk density should be calculated in the following way: 1) Take last two digital numbers from your student ID 2) Sum them up and divide by 100 3) Then add the number on the given bulk density values. For example, ID: 1234567, (6+7)/100=D0.13, then the customised values in the calculation should be 1.6+0.13=1.73; 2.0+0.13=2.13; 1.7+0.13=1.83; 1.5+0.13=1.63; 1.9+0.13=2.03. Table 2 Depth (metres) Soil Type 0-3 Bulk Density (Mg/m³) 1.6 A 3-6 В 2.0 1.7 6-8 C 8-9 D 1.5 1.9 9-11 E

a. Exploration boreholes on site show a horizontal water table at a depth of 4.5 metres. The borelog information is given in Table 2 (QB2). Calculate the total, effective and pore water pressure values at the base of each layer in kN/m2. (Take the unit weight of water as 9.81KN/m3). Please used the customised bulk density values in your calculation. The customised bulk density should be calculated in the following way: 1) Take last two digital numbers from your student ID 2) Sum them up and divide by 100 3) Then add the number on the given bulk density values. For example, ID: 1234567, (6+7)/100=D0.13, then the customised values in the calculation should be 1.6+0.13=1.73; 2.0+0.13=2.13; 1.7+0.13=1.83; 1.5+0.13=1.63; 1.9+0.13=2.03. Table 2 Depth (metres) Soil Type 0-3 Bulk Density (Mg/m³) 1.6 A 3-6 В 2.0 1.7 6-8 C 8-9 D 1.5 1.9 9-11 E

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter7: Permeability

Section: Chapter Questions

Problem 7.22P: Refer to Figure 7.24. The following data were collected during the field permeability measurement of...

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3.2 Construct IPR of a vertical well in a saturated oil reservoir using Vogel's equation. The following data are given: Porosity, = 0.2 Effective horizontal permeability, k 80 md Pay zone thickness, h 55 ft Reservoir pressure, p = 4,500 psia Bubble point pressure, p, = 4,500 psia Fluid formation volume factor, B, = 1.1 Fluid viscosity, H. = 1.8 cp Total compressibility, c, = 0.000013 psi- Drainage area, A = 640 acres (re = 2,980 ft) Wellbore radius, rw 0.328 ft Skin factor, S = 2 %3D
Refer to Figure 7.24. The following data were collected during the field permeability measurement of a confined aquifer using a pumping test. Determine the hydraulic conductivity of the permeable layer. Use Eq. (7.49). Thickness of the aquifer, H = 4.5 m Piezometric level and radial distance of the first observation well: h1 = 2.9 m; r1 = 17.8 m Piezometric level and radial distance of the second observation well: h2 = 1.8 m; r2 = 8.1 m Rate of discharge from pumping, q = 0.5 m3/min
Ex.4: A well of diameter 12 ½ in ( capacity = 0.15 bbl/ft ) is drilled by drilling mud of density 9.6 ppg at drilling velocity of 23 ft/min and flow rate 720 gpm, if the density of cutting rock is 20.8 ppg. Find the density of drilling mud in the annulus taking in to account effect of cutting rock?
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i) A pipe of 1.2 m diameter was provided in a reservoir to act as an outlet. Due to disuse, it was buried and completely clogged up for some length by sediment. Measurements indicated the presence of fine sand (coefficient of permeability, K, = 10 m/day) deposit for a length of 100 m, at the upstream end and of coarse sand (coefficient of permeability, K₂ = 50 m/day) at the downstream end for a length of 50 m. In between these two layers the presence of silty sand (coefficient of permeability, K3 0.10 m/day) for some length is identified. For a head difference of 20 m on either side of the clogged length, the seepage discharge is found to be 0.8 m³/day. Estimate the length of the pipe filled up by silty sand. =