Given the soil profile below, determine the Total Stress, Neutral Stress and Effective Stress at points A, B, C, and D . Plot as well the soil pressure diagram. H1= 1.9m; H2=0.95m; H3=1.9m
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- uniform weight of 20kN/m³ is distributed on large area. Estimate the consolidation settlement of the clay layer in case : or 1)Pc=134kPa clay Cs-0.1, Cc-0.24 o'c= Pc @²₁ 7m 2)Pc = 100kPa 8m 3M I IVLII [[[[]20/² L T T (M I Silt 8= 17 * = 21 Sand 3)Pc-250kPa clay Sal. (Gise) p / n 2PKN 7 CS= 2-7 You = 35% pc as shown alone sul-r 1670-10)+4= 154 KOA certain saturated sand (S = 100,) has a moisture content of 25.1 percent and a specificgravity of solids of 2.68. It also has a maximum index void ratio of 0.84 and a minimum indexvoid ratio of 0.33. Compute its relative density and classify its consistency.A loose, uncompacted sand fill 1.8m in depth has a relative densityof 40%. Laboratory tests indicated that the minimum and maximum voidratios of the sand are 0.46 and 0.90, respectively. The specificgravity of solids of the sand is 2.65.a. What is the dry unit weight of the sand?b. If the sand is compacted to a relative density of 75%, whatis the decrease in thickness of the 1.8m fill?
- i. A sandstone core sample is saturated 100% with water. Calculate the absolute permeability of the core sample if the water is flowing at 6.21 cubic centimetres per second. The length of the core sample is 14 centimetres and its diameters is 6 centimetres. The pressure differential across the core sample is 15 atmospheric pressure and the water viscosity is 1.2 centipoises. Explain a method of how the permeability of low permeability reservoirs can be ii. improved.Problem B: For questions 8 to 11. A cubicmeterof soil in its natural state is 18.907 KN. Afteroven-drying it weighs 15.763 KN. Assuming aspecific gravity Of 2.687. Determine the following. 8) Moisture content ? a) 0.205 9) What is the void ratio (e)? a) 0.657 b) 0.627 10) The porosity will be? a) 0.409 11) Degree of Saturation a) 79.570% b) 0.154 c) 0.259 d) 0.199 c) 0.672 d) 0.651 b) 0.402 c) 0.415 d) 0.502 b) 80.455% 78.790% d) 66.678%The Laboratory Apparatus shown maintains aconstant head in both the upper and lowerreservoirs. The soil sample is a silty sand with ahydraulic conductivity K = 5 x 10-3 cm/sec. and amoisture content of 18.5%. Specific gravity of soilsample = 2.70. Compute the seepage velocity.Determine the time required for the plug of water topass through the soil. Compute the discharge ofwater.
- Gs 2.68. Determine (at optimum moisture content):a. Void ratiob. Degree of saturationA container of volume 2.83 X 10-3 m3 weighs 9.8 N. Dry sand was poured to fill the container. Thecontainer and the sand weigh 52.3 N. Calculate (a) the void ratio and (b) the porosity. Describe thecondition of the soil (loose or dense). Assume Gs. = 2.7Give its consistency index. EXERCICE 3 Classify the following soil using the Unified Soil Classification (ASTM standard). Percentage passing N° 4 seive = 98 Percentage passing N° 10 seive = 86 Percentage passing N° 40 seive = 80 Percentage passing N° 200 seive = 71 The liquid limit = 102% The Plasticity index = 68% The water content is = 72%Give its consistency index. Indicate the activity of this soil and numerous some potential problems linked to its use in different geotechnical works. EXERCICE 4 Some tests were performed on the sandy silt according to Standard Proctor test. The volume of the mold is 944 cm. The specific gravity was measured as 2.67 1) Plot the Proctor compaction curve (see the page 2) 2) Find: 2-1 The maximum dry unit weight of sandy-silt fill, 2-2 Its OMC, 2-3 The moisture ranges for 85% of Standard Proctor Optimum, 2-4 The degree of saturation at the optimum Proctor state. 3) Plot the zero air voids curve (see the page 2) 4) Determine the values of degree of…
- Quiz 2 A partially Saurated soil specimen has a fotal mass M:1360.52 gm and water content w:28-35 % and porosity n=45-95%- IF the volume f selids in the specimen is = 392.6 cm, delermine:- a-The total volume f the specimen V. b The specific gravity of solids G. CThe air raho in the specimen AWeight of structure W.T. Sand layer H2 Clay layer Н as Compacted sand- gravel layer figure 1In the soil profile shown below, the clay is normally consolidated and H,=9m, H2=5m, H3=3m. The depth of water table is then decreased so that H;=2m, H2=12m, H3=3m. a) Calculate the overconsolidation ratio (OCR) at this stage. When a surcharge of Ao = 180 kPa applied to the surface. b) Estimate the primary consolidation settlement of the clay layer. c) Estimate the degree of consolidation will be after 40 days? d) How many days would it take for 90% consolidation? Soil characteristics are as follows (use appropriate relations from the Appendix, 9.81 kN/m³): Yw = Sand: e = 0.56; G, = 2.6 Clay: LL = 63; e = 0.83; G, = 2.77; C, = - Cc; Cy = 6.66 × 10-4cm² /s %3D Ao H1 Sand Groundwater table Sand H2 Clay. Void ratio = e H3 Normally consolidated Sand