Question

1. Using the concepts covered in earth pressure theories (not Taylor's chart), the critical depth of vertical cut in a saturated cohesive soil with c = 15.5kPa and y = 18 kN/m3 will be? a) 0.86 m c) 6.88 m b) 3.44 m d) 1.72 m condition: 2. The upstream and downstream slopes of an earth dam is critical for the a) reservoir partial pool c) steady seepage b) sudden drawdown d) earthquake 3. In the simplified Bishop's method of slices, the vertical faces of slices are assumed as: a) smooth c) to have friction angle equal to tan b) rough d) to have unequal normal forces 4. A 45-degree slope of 15 m high in a soil with undrained strength of 115 KPA and unit weight of 20.2 kN/m3, stability number = 0.181, the FS is: a) 2.1 c) 1.83 b) 1.5 d) 2.81 5. From the chart developed by Taylor for homogenous slopes, toe failure occurs for all slopes steeper than: degrees a) 63 c) 53 b) 57 d) 47 6. A long natural slope has a bedding angle of 12-degree with water table at the surface and seepage parallel to slope. The saturated unit weight, the effective cohesion and angle of shearing resistance are 20 kN/m3, 10 kN/m2 and 26 deg., respectively. If the slip develops 5 m below the ground surface along a bedding plane, the FS assuming an infinite slope condition is: a) 0.78 c) 1.66 b) 1.22 d) 1.82 7. An infinite slope represents the inclined face of: a) an earth dam c) an excavation b) an embankment d) a natural high hill slope 8. In a stability analysis for a given slip surface by the method of slices Eshear forces, Enormal forces, and Eneutral forces are 500 kN, 900kN and 200 kN, respectively. The length of failure arc is 27 m. If the cohesion and friction angle are 20 KPA and 20 degrees, respectively. Then the FS w.rit shear strength is: a) 1.20 b) 1.70 c) 1.59 d) 1.92

Answer 1

Given, C= 15.5 k pa = 15.5 km gg = 18 kN/m² biliņ fois = 8Hc F=1 for critical condition, => Hc = G 1 = 0 + 86 ) ) ) deapto (Ac ) = 0.861 .. cuitical optionia,