Q2. A long wall is to be built on a soil of angle of shearing resistance crit a = 30°. The wall is to be founded on a 1.

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Q2 A Long Wall Is To Be Built On A Soil Of Angle Of Shearing Resistance Crit A 30 The Wall Is To Be Founded On A 1 1 (152.38 KiB) Viewed 55 times

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Q2. A long wall is to be built on a soil of angle of shearing resistance crit a = 30°. The wall is to be founded on a 1.2m deep concrete strip footing. Water table is at the depth of 0.4m below the ground surface with unit weight of the soil given as Ydry = 18 kN/m3 and Ysat = 20kN/m² for the soil above and below the water table, respectively. The loadings transmitted to the soil will be 130kN/m vertically and 45kN/m horizontally. Assume that these loads are uniformly distributed over the area of the foundation. In addition, assume a footing width is such that in the zones beneath and adjacent to the footing the soil is on the verge of failure with the mobilization of the critical state soil strength with crit Construct Mohr circles of effective stress for the zones of soil beneath and adjacent to the footing. Indicate the planes on which the major principal effective stress acts in each zone and calculate the footing width. [25 marks] (Note: It may be assumed without proof that the ratio of average principal effective stress between two uniform stress zones separated by a fan zone of angle 0 is given by sa/sí = e 20 tand', and that the rotation of the direction of major principal effective stress is 2.) TOTAL 25 MARKS