Q6: A saturated clay sample was consolidated in the triaxial cell under a cell pressure of 150 kN/m². The drainage valve was then closed and the deviator stress was quickly increased to 200 kN/m² when failure occurred. If c =15 kN/m² and 4 =20, find the pore water pressure and Skempton's pore pressure coefficient A at failure.

Q6: A saturated clay sample was consolidated in the triaxial cell under a cell pressure of 150 kN/m². The drainage valve was then closed and the deviator stress was quickly increased to 200 kN/m² when failure occurred. If c =15 kN/m² and 4 =20, find the pore water pressure and Skempton's pore pressure coefficient A at failure.

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

There is an upward flow of 0.06 ml/s through a sand sample with a coefficient of permeability 3 × 10^–2 mm/s. The thickness of the sample is 150 mm and the cross-sectional area is 4500 mm2.Determine the effective stress in N/m2 at the middle of the sample, if the saturated unit weight of the sample, is 18.9 kN/m3.
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
The data from a falling-head test on a silty clay are: Cross sectional area of soil = 1000 mm^2 Length of soil sample = 200 mm Area of stand pipe = 40 mm^2 Head difference at time t = 0 is 500 mm Head difference at time t = 3 min is 300 mm a) Determine the hydraulic conductivity of the soil in cm/sec. b) What is the head difference at time t = 100 sec in mm
In a drained triaxial test on consolidated clay the stress and angle are as follows : Deviator stress is 20 lb/in2 and friction angle 210 . calculate the effective confining pressure at failure.?
It is known that a particular deposit of clay has the following shear strength parameters: c' = 15 kPa, o' = 23°; Cu = 10 kPa, cu = 13° A sample of this clay is consolidated in a triaxial cell to an all-round pressure (03) of 250 kPa. The sample is then sheared by increasing 0₁, keeping 3 constant and the drainage valve closed. What is: i) ₁ at failure? ii) Pore water pressure inside the sample at failure? iii) Final values of 0₁' and 03'? iv) Value at failure of Skempton's pore pressure coefficient A?
W1
11.5 Following are the results of a laboratory consolidation test on a sample of undis- turbed clay obtained from the field. Pressure, o' (kg/cm?) Final helght of specimen (cm) 2.540 0.5 2.519 1.0 2.5 2.0 2.428 4.0 2.322 8.0 2.206 16.0 2.09 © Cengage laeming 2014
A consolidated-drained triaxial test was conducted on an overconsolidated clay sample. The sample failed in test 1 at 01=200 kPa and 03=130 kPa, and in test 2 at o1=400 kPa and 03=290 kPa. Determine the undrained and drained friction angles and cohesion for the assumption that the Skempton's pore water pressure parameter A=0.45. Also, for a CU test on the same soil, determine o1, 1', 03', and excess pore water pressure u for 03=340 kPa.
Shear Strentgh of the soil 2014
There is an upward flow of 0.06 ml/s through a sand sample with a coefficient of permeability 3 × 10^–2 mm/s. The thickness of the sample is 150 mm and the cross-sectional area is 4500 mm2.Determine the effective stress in N/m2 at the middle of the sample, if the saturated unit weight of the sample, is 18.9 kN/m3. a. 177.38 b. 354.75 c. 88.69 d. 709.5
Question-3: (a) In a consolidated drained triaxial test, a specimen of saturated sand failed under an deviator stress of 250 kN/m², when the cell pressure was 100 kN/m². i. Illustrate by drawing the Mohr circle for the failure stress condition. Solve for ø' and the theoretical inclination of the failure plane to the ii. horizontal. iii. failure. iv. Solve for the shear stress on the failure plane and maximum shear stress at Solve for factor of safety with respect to shear strength on the plane of maximum shear stress?
In a drained triaxial test on consolidated clay the stress and angle are as follows: Deviator stress is 20 lb/in2 and friction angle is 21°. Calculate the effective confining pressure at failure.? a) 21 lb/in2 b) 22.2 lb/in2 c) 25.4 lb/in 2 d) 17.9 lb/in2