Q6: A saturated clay sample was consolidated in the triaxial cell under a cell pressure of 150 kN/m. The drainage valve was then closed and the deviator stress was quickly increased to 200 kN/m² when failure occurred. If c' pressure coefficient A at failure. = 15 kN/m? and o = 20 °, find the pore water pressure and Skempton's pore %3D

Q6: A saturated clay sample was consolidated in the triaxial cell under a cell pressure of 150 kN/m. The drainage valve was then closed and the deviator stress was quickly increased to 200 kN/m² when failure occurred. If c' pressure coefficient A at failure. = 15 kN/m? and o = 20 °, find the pore water pressure and Skempton's pore %3D

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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A dilatometer test was conducted in a clay deposit. The groundwater table was located at a depth of 3 m below the surface. At a depth of 8 m below the surface, the contact pressure was and the expansion stress was 350 kN/m2Determine the following:a. Coefficient of at-rest earth pressure,b. Overconsolidation ratio, OCRc. Modulus of elasticity,Assume stress at a depth of 8 m to be and 95 kN/m2 , poisson ratio=0.35.
5. A consolidated, undrained triaxial test is being caried out on a normally consolidated clay where c = 0 and 41= 26'. The triaxial specimen was consolidated under a cell pressure of 300 kPa and backpressure of 80 kPa. Skempton's A parameter at failure is estimated to be 0.80. The drainage valve has since been dosed and the vertical deviator stress increased to failure. What would be the deviator stress and pore water pressure at failure?
Two similar clay soil samples were pre-consolidated in triaxial equipment with a chamber pressure of 600 kN/m². Consolidated-drained triaxial tests were conducted on these two specimens. The following are the results of the tests: Specimen 1: Specimen 2: kN 0; = 100 m2 kN 0; = 50 m? (Ao,),= kN 410.6- ,kN (Ao.), = 384.37- m Shear stress KN/m? Normal stress 50 100 434.37 510.6 kN/m2 Find the values of the cohesion e and the angle of internal friction p.
A consolidated-undrained triaxial test was conducted on a clay soil with a chamberconfining pressure of 270 kN/m2. Calculate the deviator stress and the pore waterpressure at failure. Given,  ‘= 36.4oand  = 21.7o.
5. A consolidated, undrained triaxial test is being carried out on a normally consolidated clay where c - 0 and p'= 26'. The triaxial specimen was consolidated under a cell pressure of 300 kPa and backpressure of 80 kPa. Skempton's A parameter at failure is estimated to be 0.80. The drainage valve has since been dosed and the vertical deviator stress increased to failure. What would be the deviator stress and pore water pressure at failure?
The laboratory consolidation test is conducted on a clay sample. The following data results were obtained P1 =55 kPa P2 = 130 kPa e1= 0.95 e2= 0.80 Thickness of the sample of clay= 35mm Time for 50% consolidation = 3.0 min Tv= 0.197 a. Find the coefficient of volume compressibility b. Determine the coefficient of consolidation if a sample of clay was drained on both sides c. Compute the hydraulic conductivity of the clay
(b) An oedometer test on a specimen of fully saturated stiff clay gave the following results in Table 1 for the pressure increment from 100 kN/m2 to 200 kN/m?. The initial thickness of the specimen under no pressure was 19 mm. Determine my, cy and k using Taylor's Method.
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
2. The results of a consolidated-drained triaxial test conducted on a normally consolidated clay are as follows: Chamber confining stress = 220 KPa Deviator stress at failure = 320 KPa (a) Angle of friction (b) Angle of failure (c) Normal and Shear stress on the failure plane Calculate:
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.
Example 9.2: A clay soil, tested in a consolidometer, showed a decrease in void res •m 1.20 to 1.10 when the presure was increased from 0.25 to 0.50 kgflem?. Calculate to. efficient of compressibility (a) and the coefficient of volume compressibility (m). If t •ficient of consolidation (c,) determined in the test for the given stress increment u m?/year, calculate the coefficient of permeability in cm/s. If the sample tested at the site was taken from a clay layer 3.0 m in thickness, determin consolidation settlement resulting from the given stress increment. lution: