A uniform surcharge of 32kN/m2 has been applied on the horizontal ground surface lying 8m above the top of a 4m thick, saturated clay layer. Above the clay is sand (Unit weight of sand%318kN/m³), and below the clay (Unit weight of clay=20kN/m) lied impervious rock. The final consolidation settlement in the clay layer has been calculated as 24mm. The point P lies 1.0m below the top of the clay layer. The coefficient of consolidation of the clay is 1.6m2/year. (Remainder Ty=ct/d). Just write the answers, no need to show calculations. a) What is the degree of consolidation at point P, when the pore pressure at P is 68kPa? b) How many years are required for 50% average degree of consolidation in the clay layer, if the relevant time factor is 0.196.? C) What is the effective stress at the middle of the sand layer immediately after the application of surcharge, if the drained and saturated unit weights of the sand are 16kNm3 and 18KN/m3, respectively. d) What is the increase in effective stress at P immediately after the application of the surcharge.?

A uniform surcharge of 32kN/m2 has been applied on the horizontal ground surface lying 8m above the top of a 4m thick, saturated clay layer. Above the clay is sand (Unit weight of sand%318kN/m³), and below the clay (Unit weight of clay=20kN/m) lied impervious rock. The final consolidation settlement in the clay layer has been calculated as 24mm. The point P lies 1.0m below the top of the clay layer. The coefficient of consolidation of the clay is 1.6m2/year. (Remainder Ty=ct/d). Just write the answers, no need to show calculations. a) What is the degree of consolidation at point P, when the pore pressure at P is 68kPa? b) How many years are required for 50% average degree of consolidation in the clay layer, if the relevant time factor is 0.196.? C) What is the effective stress at the middle of the sand layer immediately after the application of surcharge, if the drained and saturated unit weights of the sand are 16kNm3 and 18KN/m3, respectively. d) What is the increase in effective stress at P immediately after the application of the surcharge.?

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

4. The construction of a 10m x 10m square water tank in a residential neighbourhood has been planned. As indicated in Figure below, a 6m thick soft clay layer was discovered between sand layers during site exploration. For laboratory studies, an undisturbed soil sample was obtained in the middle of the soft clay layer. The findings of the laboratory consolidation test are listed below. Pressure, o' (kN/m2) | 25 50 100 200 400 800 Void Ratio, e 1.28 1.26 1.22 1.14 1.05 0.95 i. Find the preconsolidation pressure (o'c), Virgin, and Laboratory Compression Index using the information above (Cc). Find the primary consolidation settlements that will occur at the water tank's centre due to compression of the soft clay layer ii. 10 m Load = 18,000 kN Ground Level 1 m Ground water level Dense Sand, y= 20 kN/m³ 2 m Soft Clay Kat = 16 kN/m³ ; eo= 1.38 Cc = graph? ; Cs =Cc; o' = graph? 6 m %3D %3! Very Dense Sand
Given the soil profile below, estimate the consolidation coefficient of the clay if Ao_z = 500 psf at the middle of the clay. Use one layer for the clay in your calculation. он 10 ft 20 ft וד Incompressible Sand' V Clay sat = 120 pct CR = 0.3 TIT RR = 0.15 Pp = 1776 pst 8 Sat 120 pct
rock mechanicz
6 m thick silty sand filling was laid on a 12 m thick compressible clay layer with controlled compression technique. Under this clay layer, there is a 4 m thick pebbly sand layer. Assuming that the settlement of the embankment and gravel-sand layer is insignificant compared to the settlement of the clay layer, calculate the consolidation settlement of the clay layer and when 50% of this settlement will occur. NOTE: You can make the settlement calculation as a single layer calculation.
2.2 A consolidated-drained triaxial test was conducted on a normally consolidated clay. The results are: 03=140 kN/m? (Aga) f=104KN/m2 Please determine oi and 3.
Q2: Available field data indicate that the permeahility for the clay is varies with depth. For layer 1: ku = 3.2 x 10 cmis; k = 1.1 x 10 cmis. For layer 2: kg - 1.7 x 10 em's; ka - 3.4 x 10" cm/s. For layer 3: kg - 1.4 x 10 cmis; ka - 44 x 10* cm/s. Compute the equivalent permeability for flow parullel and perpendicular to the clay layers shuwn in Fig.2. Layr 1 L 2 Layer a Fig.2 180 m
In a drained tri-axial compression test, a sample of sand fails at deviator stress of 150 kPa under confining pressure of 50 kPa. The angle of internal friction (in degree, round off to the nearest integer) of the sample, is
How do I begin to approach this problem?
A Sample of Clay is isotropically normally consolidated to a cell pressure of 350kPa. The sample was then sheared (standard) in a drained state. Calculate values of q, p', and v at failure if the soil constants were: M=0.88, N=2.88, I-2.76, and 2-0.16