Trench boxes must be able to handle the pressure at the depth where they'll be used and for the type of soil they'll be used in. The competent person can use the manufacturers' tabulated data to determine if a trench box is appropriate for a particular situation. If a trench is de...
The angle of incline required to prevent a cave-in varies with differences in such factors as the soil type, environmental conditions of exposure, and application of surcharge loads. Stable rock means natural solid mineral material that can be excavated with vertical sides and will remain intact ...
Firstly, the reluctant width, depth and regularity of the river channel, the height of the river bank and the length of the slope; the nature of riverbed and sediment and the hardness of soil, the distribution of trees and buildings on the shore; the height, size and passage of the bridg...