1. To evaluate shear strength to be used in stabilityanalysis of a slope, two drained direct shear testshave been performed on samples of a highlyoverconsolidated clay. One test was carried out ona remolded sample under effective vertical stressof 300 kPa, and a shear strength of 121 kPa wasmeasured. The second test was carried out on aprecut sample under effective vertical stress of 300kPa, and a shear strength of 48 kPa was measured.On the basis of previous field experience with theoverconsolidated plastic clay, it is expected thatthe peak (intact) strength envelope will show acohesion intercept c' (mob) of 10 kPa for effectivenormal stress range near 200 kPa. Compute theshear strength to be used on a segment of a slipsurface on which the effective normal stress is 200kPa, if the slip plane passes through: (a) materialthat is badly fissured and jointed; however, there isno preexisting continuous plane of discontinuity;(b) material that contains a preexisting plane ofdiscontinuity oriented in the direction of globalmovement; (c) material that according to bore holerecords appears to be free of joints and fissures andthere is no preexisting plane ofdiscontinuity; and (d) if for condition (b) the factorof safety was equal to 1.2, compute the factor ofsafety if the porewater pressure at the slip planeincreases by 50 kPae 3:16 /

According to given dataA) Material is badly fissured and jointed because of it will not show own…

Answered: e been performed on samples of a highly…

e been performed on samples of a highly consolidated clay. One test was carried ou molded sample under effective vertical stre 10 kPa, anda shear strength of 121 kPa wa

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter12: Shear Strength Of Soil

Section: Chapter Questions

Problem 12.23P

See similar textbooks

Similar questions

A geotechnical engineer is evaluating the stability of a silty sand slope as shown. This evaluation is considering the potential for a shear failure at an infinitesimal point (soil element) on the trial shear surface. At this point, the soil is subjected to a major principal stress of +150 kN/m^2 and a minor principal stress of +50 kN/m^2(A) Using the Pole Method, find the intensity of the normal and shear stresses acting on the shear plane making a 50 deg angle with the major principal plane of the infinitesimal element of soil. (Plot the Mohr circle) (B) If the silty sand is found to have a cohesion of 250 kPa and a friction angle of 25 deg from direct shear (DS) testing, plot the failure envelope against the same pole-method graphical construction completed under question above. (C) Determine the factor of safety (FOS) against potential landsliding at this same point on the shear surface
A cut slope in soft clay has been constructed as part of a road alignment. The slope is 21.8 degrees and 10 m high. The unit weight of the soft clay is 18kN/m3. (i) A walk over survey recently indicated signs of instability. Samples have been collected from the slope and the drained analysis parameters for the soil have been determined as follows: Soil properties: φ'= 24 º, c'=2.5kPa, γd=19kN/m3 , γsat=20kN/m3 Based on the effective stress parameters given, perform a quick initial estimate of the factor of safety of this slope using Bishop and Morgernsterns charts. Assume an average pore water pressure ratio (ru) of 0.3 for the slope
What is the difference of the failure plan of soil sample in Triaxial Test and in Direct Shear? And the effect of this difference on the shear strength of soil ?
Question-3:(i). For the given failure surface, determine the factor of safety in terms of total stress for the slope given in the Figure 01. The unit weight for both soils is 19 kN/m3. The characteristic undrained strength (cu) is 30 kN/m2 for soil 1 and 45 kN/m2 for soil 2. What is the factor of safety aginst slope failure?(ii). Which method of slope stability analysis you would use to evaluate long term stability of the slope shown in Figure 01, and Why?
Determination of failure criterion of soil through shear strength test is possible to evaluate parameters which can then be used in geotechnical design. Briefly explain the mohr-coulumb failure criterion .
From the given data determine these soil properties and analyse the results, how important are these test data and how can they be integrated within geotechnical design procedures. - If a soil sample tested in a direct shear box of 60 mm by 60 mm and the maximum readings for normal loads of 0.3, 0.5 and 1.0kN were 202, 265 and 511 kN, determine the strength parameters corresponding to effective stress.
A field vane shear test was conducted in saturated clay. The height and diameter of the vane were 101.6 mm and 50.8 mm respectively. During the test, the maximum torque applied was 0.0168 kN.m Determine the undrained shear strength of the clay?
The results of a three consolidated undrained tri-axial test on saturated clay are as follows: Compute the angle of internal friction a. 15.03 degreesb. 12.06 degreesc. 18.40 degreesd. 31.05 degrees
In conducting triaxial test to determine shear strengths for soil samples, what consolidation pressures should be specified?
A saturated specimen of cohesionless sand was tested under drained conditions in a triaxial compression test apparatus and the sample failed at a deviator stress of 482 kN/m2 and the plane of failure made an angle of 60° with the horizontal. What would be the magnitude of the deviator stress in kPa at failure for identical specimen of sand if it is tested under a cell pressure of 200 kPa? a.241 b.200 c.600 d.400 With Free Body Diagram
A triaxial shear test was performed on a clayey soil under unconsolidated undrained conditions. Find the cohesion of this soil if major and minor stresses at failure were 144 and 48 kN/m2, respectively.
A vane shear test was conducted in a saturated soft clay,using a 100 mm 3 200 mm vane. When the vane was rotatedat the standard rate of 0.1°/s, the torque measured inthe torque meter increased to 60 N ? m, and with further rotationreduced to 35 N ? m. Determine the peak and residualundrained shear strengths of the clay.