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How does the roughness of a retaining wall interface affect the active and passive earth pressures? What happens to stability checks if we chose to ignore it?

How does the roughness of a retaining wall interface affect the active and passive earth pressures? What happens to stability checks if we chose to ignore it?

Principles of Foundation Engineering (MindTap Course List)
Principles of Foundation Engineering (MindTap Course List)
9th Edition
ISBN:9781337705028
Author:Braja M. Das, Nagaratnam Sivakugan
Publisher:Braja M. Das, Nagaratnam Sivakugan
Chapter18: Sheet-pile Walls
Section: Chapter Questions
Problem 18.2P
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Q1. Give short, justified answers to the following questions: How does the roughness of a retaining wall interface affect the active and passive earth pressures? What happens to stability checks if we chose to ignore it? (a) (b) The skin shear resistance, Qs, around a pile segment running through a clay layer, represents the 15% of the total bearing capacity of the pile, Qu. If the layer develops negative skin friction, how will the factor of safety change. Select the correct answer and justify it. (i) by 15% (ii) more than 15% (iii) less than 15%. (c) Under which conditions could a “block failure" mechanism provide a “reasonable" prediction for the bearing capacity of a pile croup? Briefly describe the philosophy behind the Eurocode 7 design approaches with load factors. Why is this different compared to the conventional, overall safety factor approach? (d) (e) Give an example of a "plane strain" and an "axi-symmetric" geotechnical problem. Why is “plane strain" 2D modelling still popular in geotechnics?
Transcribed Image Text:Q1. Give short, justified answers to the following questions: How does the roughness of a retaining wall interface affect the active and passive earth pressures? What happens to stability checks if we chose to ignore it? (a) (b) The skin shear resistance, Qs, around a pile segment running through a clay layer, represents the 15% of the total bearing capacity of the pile, Qu. If the layer develops negative skin friction, how will the factor of safety change. Select the correct answer and justify it. (i) by 15% (ii) more than 15% (iii) less than 15%. (c) Under which conditions could a “block failure" mechanism provide a “reasonable" prediction for the bearing capacity of a pile croup? Briefly describe the philosophy behind the Eurocode 7 design approaches with load factors. Why is this different compared to the conventional, overall safety factor approach? (d) (e) Give an example of a "plane strain" and an "axi-symmetric" geotechnical problem. Why is “plane strain" 2D modelling still popular in geotechnics?
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