Qi/ A 5m deep deposit of silty sand lies abovea 4m deep deposit of gravel. The gravel is under-lain by a deep layer of stiff clay. The ground watertable is found 2m below the ground surlace. TheSoil properties are :-ofsand below GWT = 1.75 Mg/m³Isat of gravel2.05Mg/m ³Isat of sand above G.WT = 1.7 Mg/m²³2Draw The distribution of vertical total stress,Pore water pressure, and vertical effective stress withdepth down to the clay layer.P = 1.7 My/m²³-$t1 = 1.95 Mg/m³,silty sandSeat - 2.05 Mg/m²/G.LG.WT Igravelstill clay)4m

We know, 1 mg/m3 = 9.81 kn/m3 , Calculation of effective stress ;

21/ A 5m deep deposit of silty sand lies above gravel is under- a 4m deep deposit of gravel. lain by a deep layer of stiff clay. The ground water table is found 2m below the ground surface. The Soil properties are :- 2 at sand below GWT = 1. 2.05 Psat of gravel Mg/m ³ Isat of sand above G.WT = 1.7 Mg/m ³ 1.75 Mg 1 m³ Draw The distribution of vertical total stress, Pore water pressure, and vertical effective stress with depth down to the Clay layer. P = 1.7 My/m³. Sa Ssat 2.05 Mg/m²/ 8+₁=1.95 Mg/m²/silty sand gravel G.L -7GWT I still clay) 4m

21/ A 5m deep deposit of silty sand lies above gravel is under- a 4m deep deposit of gravel. lain by a deep layer of stiff clay. The ground water table is found 2m below the ground surface. The Soil properties are :- 2 at sand below GWT = 1. 2.05 Psat of gravel Mg/m ³ Isat of sand above G.WT = 1.7 Mg/m ³ 1.75 Mg 1 m³ Draw The distribution of vertical total stress, Pore water pressure, and vertical effective stress with depth down to the Clay layer. P = 1.7 My/m³. Sa Ssat 2.05 Mg/m²/ 8+₁=1.95 Mg/m²/silty sand gravel G.L -7GWT I still clay) 4m

Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN:9781337705028

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter2: Geotechnical Properties Of Soil

Section: Chapter Questions

Problem 2.16P

See similar textbooks

Similar questions

The profile at a site consists of 5m of sand overlying 10m of compressible clay, which in turn overlies a dense sand. The water table is at the top of the profile. The total unit weight of the top sand is 19kN/m3 and that of the clay is 18kN/m3. The Cv of the clay is estimated to be 5x 10-3 cm2/sec. Initially the clay is normally consolidated. It is planned to place a temporary fill that will exert a vertical load of 200kPa over the entire site. How long must the fill be in place so that, after it is removed, the maximum past pressure at every point in the clay is at least 50kPa larger than the vertical effective stress that existed before the fill was placed?
SITUATION 4: As soil profile shown below. The sand above the ground water table is dry. Other data pertaining to the table as follows: H₁ 4m, H₂= 3.2m, H₂ = 1m
A soil formation is composed of 5 m thick clay and 5 m thick sand being the sand above the clay. The ground water table (GWT) is located at 2 m below the ground surface. 40 kPa 2 m Sand Ydry = 17.66 kN/m^3 VGWT Sand 3 m Y sat = 20.93 kN/m^3 LI = 64% PL = 20% w = 40% 5 m Clay eo = 0.60 G. = 2.60 1. Calculate the primary compression index. [ Select ] 2. Calculate the primary consolidation settlement of the normally consolidated clay layer if there is a surcharge of 40 kPa acting on the ground surface. [ Select] 3. Calculate the secondary settlement of the clay layer 5 years after the completion of the primary consolidation settlement. Time for completion of primary settlement is 2 years. Use C, = 0.02. [Select ]
The coefficient of permeability of a sand at a void ratio of 0.62 is 0.03 cm/sec. estimate the coefficient of permeability at a void ratio of 0.48. a. Using Casagrande equation b. Using kozeny - Carman equation.
2 m 2 m 3 m Figure P2.11 A Dry sand; e = 0.5 G, = 2.65 B Water table Sand Gs = 2.65 e = 0.6 C Clay w = 36% GS = 2.75 D Rock
be the hydraulic conductivity at 20°C? Ans. 1.0 x 10 cm/sec 4. For a normally consolidated clay, the following values are given. k(cm/sec) 0.45 x 10 e 0.78 1.1 0.88 x 10 Estimate k at a void ratio of 0.97 6.0089 107
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 KO
be the hydraulic conductivity at 20 Docs A20 pe 4. For a normally consolidated clay, the following values are given. k (cm/sec) 0.45 x 106 0.78 1.1 0.88 x 106 Estimate k at a void ratio of 0.97
A huge marble boulder on a quarry site sits on the ground. This marble is 10 m by 10 m and has a height of 16 m. The boulder is situated on a 6 m thick soil with e = 0.70, S = 65%, and G, = 2.68, then by a 5 m thick clay with e = 0.80, G, = 2.71 and LL = 48. The water table exists in between the sand-clay interface. The specific gravity of the marble is 2.60. Assuming that the clay is normally consolidated... Q: What is the primary consolidation settlement of the clay layer in mm using approximate method? Round off your answer to the nearest whole number.
The profile at a site consists of 5 m of sand overlying 10 m of compressible clay, which in turn overlies a dense sand. The water table is at the top of the profile. The total unit weight of the top sand is 19 kN/m3, and that of the clay is 18 kN/m3. The cv of the clay is estimated to be 5 x 10-3 cm2/sec. Initially the clay is normally consolidated. It is planned to place a temporary fill that will exert a vertical load of 200 kPa over the entire site. How long must the fill be in place so that, after it is removed, the maximum past pressure at every point in the clay is at least 50 kPa larger than the vertical effective stress that existed before the fill was placed?
A layer of soil profile consists of 3.6m upper layer of sand having a saturated unit weight of 18.88 kN/m3 and a lower clay layer 16m deep waith saturated unit weight of 17.31kN/m3. The clayayer has a void ratio of 1.27. The sand layer has a liquidity index of 64.5% and moisture content of 40%. Plastic limit is 20%. Water is located at the ground surface. A tank 12 m high is located at the ground and contains oil with density of 0.81. A. Determine the effective vertical stress at the mid height of clay layer. B. Determine the consolidation settlement of the clay layer. C. Determine the maximum depth that the cylinder be buried so that the settlement will be minimum.
A clay s tratum(e) thick is locatrd at depth of (6m) from the ground Sarface The natural Mo's fure Con tent of the clay is (s6%) oind Gc-275 The Sil sthafum between the ground sur face and the clay Consist of fine Sand. The water table is focuteel at deth of czm) below the ground Srface, The Sum berge d unit weiglt of fine Sand is (la.5) kNhn3 and its moist unit weight akeive woter table is (18.68 ENm) Caleutate the effective stress at the Center of the clay tayer.