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Sub-surface Drainage:
Sub-surface drainage is intended to take away the water seeping through the pervious layers of the soil, causing a high water table, or in cut slopes of hills. The arrangement usually consists of a trench, at the bottom of which is laid a perforated or porous pipe. The trench is filled with stone aggregates. Figure shows a sub-surface drain in a hill slope, which drains away the water and prevents landslides and slips. Figure shows a sub-surface drainage system for lowering the water table.
Figure : Subsurface Drain at Cut Slopes
Figure : Sub-drains for Lowering Ground Water Table
Disadvantages of cement sand mortor
Q. What is Portal Cranes? The Portal crane is a hydraulically driven four wheeled machine and is meant for carrying sleepers or track panels. The power for running and working
An undisturbed sample of sand has a dry weight of 18.9 N and a volume of 1143 cm 3 . The solids have a specific gravity of 2.72. Laboratory tests indicate void ratios of 0.40 and 0
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• The bar carries equal weights at equal distances from the weight lifter's hands • The reactions (R) at the hands must be equal and opposite to the weights • The pair of for
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Cargo Handling Facilities: All water transport terminals require cargo handling facilities. Cranes of various sizes are used. In docks, traveling cranes are popular (Figure).
A soil has a plastic limit of 25% and a plasticity index of 30. If the natural water content of the soil is 34%, what is the liquidity index and what is the consistency index? H
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