Figure 1 illustrates surcharge of 90 kPa was on the surface over an extensive area for a road construction project, where a 6m-thick layer of saturated clay (y= 20 kN/m³) is overlain by 4m of compacted soil (y= 18 kN/m³). The water table is at the top of the clay layer, and pore water pressures are hydrostatic below this depth. Calculate total stress, pore water pressure and effective stress, at the mid-depth of the clay layer; (a) Immediately after construction (b) After few years of completion. *Take the unit weight of water as 9.81kN/m³. 90 kPa Compacted soil 4m Clay 6m

Figure 1 illustrates surcharge of 90 kPa was on the surface over an extensive area for a road construction project, where a 6m-thick layer of saturated clay (y= 20 kN/m³) is overlain by 4m of compacted soil (y= 18 kN/m³). The water table is at the top of the clay layer, and pore water pressures are hydrostatic below this depth. Calculate total stress, pore water pressure and effective stress, at the mid-depth of the clay layer; (a) Immediately after construction (b) After few years of completion. *Take the unit weight of water as 9.81kN/m³. 90 kPa Compacted soil 4m Clay 6m

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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Effective Stress in Soil Problem 1. The water table in a certain deposit of soil is at a depth of 2m below the ground surface. The soil consists of clay up to depth of 4m from the ground and below which lies sand. The clay soil is saturated even above the water table: Clay strata: ? = 30%,?? = 2.72 Sandy Strata: ? = 26%, ?? = 2.64 1. Compute the total pressure. 2. Compute the pore water pressure. 3. Compute the effective stress pressure at a depth of 8m below the ground surface