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Sub:     Report showing the Technical reasons for the collapse of the Boundary Wall
 
 
 During inspection it was observed that the Boundary Wall about 245’ Long collapsed due to Earth Pressure and water pressure from the Factory side. The sketch below will express the position of the Boundary Wall with respect to the adjoining Vacant Land.


From the figure 1 above it can be seen that there is a difference of level by about 7’ (7 feet) between the Factory side and Vacant Land side. This 7’ Earth on the Factory side exert a pressure on the masonary retaining wall of 22’ thick.
 
From Fig No.2 it may be seen that P is the resultant Earth pressure which is acting at a hieght of h/3=700 mm above ground level. The value of P is given by Rankine Formula of active Earth Pressure which is as follows:


This shows that P= 1 Ton horizontal pressure on the wall by the earth on Factory side. This P
 
is increased when soil is saturated with rain water. If the STONE Masonary wall was
 
provided with weep holes at an interval of 1 Meter interval then the rainwater could have
 
been drained out through weep holes there could be only Earth pressure of 1 T on the stone
 
masonary wall.
 
Reason of collapse of wall
 
Due to Earth and water pressure the STONE Masonary wall of 7’ ht inclined towards the
 
vacant land by about 6’ as shown below:


This inclination started developing from the date of construction of the wall. However in course of time the inclination increased and it reached its culmination during rainy season when water pressure also added to the Earth Pressure. Due to the development of inclination, the 9” Brick wall collapsed due to excessive tension developed in the Brick wall due to bending moment
CA. Sanjeev Soni
CA. Sanjeev Soni
Name08-Aug-2014
Name1658
Name
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