TITLE:
DETERMINATION OF THE FIELD DENSITY AND DRY UNIT WEIGHT BY CORE CUTTER METHOD.
OBJECTIVES:
THEORY:
Bulk density is defined as the ratio of weight of silver to the total volume of the soil.
`gamma _t=W/V`
Dry Unit Weight is defined as the ratio of Unit Weight of solid to the volume of soil.
`gamma_s=W_s/V`
Core cutter Method can be used to find the bulk density of soil.
Let,
`M_1=`Mass of clean core cutter
`M_2=`Mass of clean core cutter + Soil sample.
`V=`Volume of soil in cutter`=(pi\ d^2)/4*H`
Then, Mass of soil is,`M=M_2-M_1`
Now,
Bulk density is, `gamma_t=M/V=(M_2-M_1)/V`
If `M=`M....Show More
TITLE:
DETERMINATION OF THE FIELD DENSITY AND DRY UNIT WEIGHT BY CORE CUTTER METHOD.
OBJECTIVES:
THEORY:
Bulk density is defined as the ratio of weight of silver to the total volume of the soil.
`gamma _t=W/V`
Dry Unit Weight is defined as the ratio of Unit Weight of solid to the volume of soil.
`gamma_s=W_s/V`
Core cutter Method can be used to find the bulk density of soil.
Let,
`M_1=`Mass of clean core cutter
`M_2=`Mass of clean core cutter + Soil sample.
`V=`Volume of soil in cutter`=(pi\ d^2)/4*H`
Then, Mass of soil is,`M=M_2-M_1`
Now,
Bulk density is, `gamma_t=M/V=(M_2-M_1)/V`
If `M=`Mass of container
`M_3=`Mass of container + soil
`M_4=`Mass of container + dry soil
Then, water content `w=M_w/M_s=(M_3-M_4)/(M_4-M)`
The dry unit weight is thus,
`gamma_s=gamma_t/(1+w)`
APPARATUS REQUIRED:
PROCEDURES:
The internal dimension of the core cutter was measured and its volume was calculated. The mass of core cutter was then found out.
The ground where the density was to be determined was cleaned.
The cylindrical cutter was then pressed into the ground soil to its full depth with the help of Steel rammer.
The core cutter was then removed from the soil layer by excavating the soil surrounding the cutter.
The mass of cutter with soil sample was taken,`M_2`.
Some of the representative specimen of soil was taken for water content determination.
The mass of container was noted,`M`.
The mass of container along with representative specimen was noted,`M_3`.
The container was then kept in oven for about 24 hours and its mass was noted,`M_4`.
OBSERVATIONS:
Mass of empty cutter, `M_1=0.9595 \ kg`
Mass of cutter + Soil sample, `M_2=2.6090\ kg`
Mass of container, `M=0.0109\ kg`
Mass of container + soil sample, `M_3=0.0696 \ kg`
Mass of container + dry soil sample, `M_4=0.0563\ kg`
CALCULATIONS:
The bulk unit weight of soil is,
`gamma_t=(M_2-M_1)/V`
Where, `V=(pid^2)/4*H`
`=pi/4*0.1^2*0.13`
`=1.021*10^(-3)M^3`
Thus, `gamma_t=(2.6090-0.9595)/(1.021\ * 10^(-3))`
`=1615.5\ (kg)/M^3`
Water content is, `w=(M_3-M_4)/(M_4-M)`
`=(0.0696-0.0563)/(0.0563-0.0109)`
`=0.293`
The dry unit weight is,
`gamma_s=gamma_t/(1+w)`
`=1615.5/(1+0.293)`
`=1249.47\ (kg)/M^3`
RESULTS:
Hence, the bulk density of soil was found to be `1615.5\ (kg)/M^3` and dry Unit Weight was found to be `1249.47 \ (kg)/M^3`.
SOURCES OF ERRORS:
There may be slight either while observing weight.
PRECAUTIONS:
Apparatus should be handled carefully.
Weight observation should be taken carefully.
CONCLUSIONS:
Thus, the bulk density and dry Unit Weight of given soil sample was determined.
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