1. A pumping well is to be constructed in an area where the water table is at a depth of 2.1 m from the ground surface of a pervious stratum. Total depth of soil drilling (extraction) for the well from the ground surface is 12.5 m and at this depth, an impervious layer was encountered. Diameter of the pumping well is 580 mm. At a constant rate of pumping the water from the well, the maximum drawdown was 6.8 m. Yield from the well is 215 m³/day and hydraulic conductivity of the pervious stratum is 5.112 m/day. The total extracted soil from the well construction was examined for soil property determination. Total weight of the extracted soil was 64.1 kN. Assume that this soil is 100% saturated and its specific gravity of soil solids is 2.50. If the well will be closed after its life span, it will be backfilled with soil coming from the borrow pit area and to be compacted to attain the same unit weight just like the natural state of the soil stratum. In the borrow pit area, natural unit weight of soil is 16.2 kN/m³. Moisture content and specific gravity of soil solids for the soil are 14.2 % and 2.20, respectively. Draw and label the aquifer and determine the following requirements: a. Radius of influence for the well. b.Natural unit weight of the pervious stratum. c. Void ratio of the pervious stratum
1. A pumping well is to be constructed in an area where the water table is at a depth of 2.1 m from the ground surface of a pervious stratum. Total depth of soil drilling (extraction) for the well from the ground surface is 12.5 m and at this depth, an impervious layer was encountered. Diameter of the pumping well is 580 mm. At a constant rate of pumping the water from the well, the maximum drawdown was 6.8 m. Yield from the well is 215 m³/day and hydraulic conductivity of the pervious stratum is 5.112 m/day. The total extracted soil from the well construction was examined for soil property determination. Total weight of the extracted soil was 64.1 kN. Assume that this soil is 100% saturated and its specific gravity of soil solids is 2.50. If the well will be closed after its life span, it will be backfilled with soil coming from the borrow pit area and to be compacted to attain the same unit weight just like the natural state of the soil stratum. In the borrow pit area, natural unit weight of soil is 16.2 kN/m³. Moisture content and specific gravity of soil solids for the soil are 14.2 % and 2.20, respectively. Draw and label the aquifer and determine the following requirements: a. Radius of influence for the well. b.Natural unit weight of the pervious stratum. c. Void ratio of the pervious stratum
Chapter2: Loads On Structures
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Transcribed Image Text:1. A pumping well is to be constructed in an area where the water table is at a depth of 2.1 m from the
ground surface of a pervious stratum. Total depth of soil drilling (extraction) for the well from the
ground surface is 12.5 m and at this depth, an impervious layer was encountered. Diameter of the
pumping well is 580 mm. At a constant rate of pumping the water from the well, the maximum
drawdown was 6.8 m. Yield from the well is 215 m³/day and hydraulic conductivity of the pervious
stratum is 5.112 m/day.
The total extracted soil from the well construction was examined for soil property determination. Total
weight of the extracted soil was 64.1 kN. Assume that this soil is 100% saturated and its specific
gravity of soil solids is 2.50. If the well will be closed after its life span, it will be backfilled with soil
coming from the borrow pit area and to be compacted to attain the same unit weight just like the
natural state of the soil stratum.
In the borrow pit area, natural unit weight of soil is 16.2 kN/m³. Moisture content and specific gravity
of soil solids for the soil are 14.2 % and 2.20, respectively.
Draw and label the aquifer and determine the following requirements:
a. Radius of influence for the well.
b.Natural unit weight of the pervious stratum.
c. Void ratio of the pervious stratum
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