earth pressure at rest
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This document discusses earth pressure at rest for foundation engineering. It defines the coefficient of earth pressure at rest (Ko) as the ratio of horizontal to vertical stress. Using Ko, it describes how to calculate the lateral pressure at rest (Po) and total lateral pressure (ph) at a given depth, accounting for factors like a water table. Diagrams show how the pressure distribution forms a triangle against a retaining wall, with the maximum pressure at the bottom. Equations are provided to calculate the pressure and total force per unit length of the wall for dry, saturated, and water table conditions.
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I have prepared this ppt during my college days as a part of semester evaluation . Hope this will help to current civil students for their ppt presentations and in many more activities as a part of their semester assessments.
I have prepared this ppt as per the syllabus concerned in the particular topic of the subject, so one can directly use it just by editing their names.
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Anyone looking to modify these files and use them for their own teaching purposes can contact me directly to get hold of editable version.
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Sources
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- 1. TOPIC EARTH PRESSURE AT REST SUBJECT :- FOUNDATION ENGI NEERING PREPARED BY ER. SANJEEV SINGH SNJV432@GMAIL.COM PART II
- 2. EARTH PRESSURE AT REST The expressions for earth pressure at rest would be used to for the determination of the magnitude and line of action of the total forces due to earth pressure on the retaining structure. Fig show a retaining wall in which no movement take place. The vertical effective stress at point A at a depth Z is given by The horizontal effective stress can be obtained using the coefficient of earth pressure at rest {Ko}, which is equal to the ratio of the horizontal stress to the vertical stress. Thus
- 3. EARTH PRESSURE AT REST The stress x is usually represented as Po, indicating the lateral pressure at rest. Thus It may be noted that the coefficient of lateral pressure at rest {Ko} relates the effective stresses. Thus total lateral pressure {ph} is equal to the sum of the intergranular pressure{po} and the pore water pressure {u}. Thus In fig the lateral pressure at depth Z is therefore. As above equation indicates, the pressure distribution is triangle with zero pressure at the top{z=0} an the maximum pressure at bottom of the wall.
- 4. EARTH PRESSURE AT REST As fig (a) show the pressure distribution when the soil is dry. The pressure at the bottom of the wall at depth H is given by The total pressure force per unit length of the wall is given by
- 5. EARTH PRESSURE AT REST In fig (b), the depth of water table is at depth d below the surface. The pressure at depth z>d is given by The pressure at the bottom (Z=H) of the wall is given by
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