Can be made up 2.onstant inedu LOOIS3. scale accurate to 0.01gCoarse-grainedsoilPROCEDURE:To measuringcylinder1. Identify the constant head at the source and record it. Be sure to measure froman appropriate datum and be consistent throughout the experiment.2. Measure the total length of the sample (AL) and determine sample cross-sectional area (A) in cm², (Note: the sample is situated in a 2.5" inside diameteracrylic pipe).3. Using a 500ml beaker and a stopwatch, collect a volume of waterNOTE: choose any time interval that will allow a sufficient volume of water to collect inthe 500 ml beaker.4. Record water temperature and determine the mass of water collected using ascale accurate to 0.01g.5. Repeat steps 3 and 4 at least 2 times to calculate an average flow rate.( Convertmass of water to volume of water using an appropriate value for the density ofwater and calculate the flow for each trail)6. Using Darcy's Law calculate the hydraulic conductivity, k in cm/sNote:Darcy's Law: K =ΔΗχΑ7. Correct and report k to at a temperature of 10 °C.КтхптAnd K =nWhere:n=viscosity in different temp (table1)Table1.ViscosityTemperature(°C)ViscosityTemperature(°C)TemperatureViscosity(poises)0.013077(poises)(°C)(poises)0.00957910160.01111122110.012713170.010828230.009358120.012363180.010559240.009142130.012028190.010299250.008937140.011709200.010050150.011404210.009810Table2.Trail no.12Average Water Temp, T (°C)Length of sample, AL cm12Diameter of sample, D (cm)2.5"Area of sample, A cm2Constant head, AH cm50-10Elapsed time, t, (sec)20Mass of Water, (g)78Volume of water, V cm3Flow, Q (cm3/s)k@Temp, cm/sk10 (corrected to 10 °C) cm/s Part B:dhFalling Head Method+Standpipe1. Measure the total length of the sample (AL) anddetermine sample cross-sectional area (A) in cm? as wellas the cross-sectional area of the observation tube (Note:the sample is situated in a 2.5" inside diameter acrylicpipe and the observation tube has an inside diameter of0.25".).2. Record the initial head in the observation tube in (cm).Fine-grainedsoilTo beaker3. Using a stopwatch start recording the elapsed time once you have opened thestopcock at the bottom of the sample. Stop the watch and close the stopcock at thesame time and record the final head in the observation tube(dh cm)4. Using Darcy's Law calculate the hydraulic conductivity, k in cm/sL × dobsK =Lnt x d?5. Correct and report k to at a temperature of 10 °C.Table3.Average Water Temp, T (°C)20Length of sample, L cm12Diameter of sample, ds (cm)2.5"Diameter of observation tube, dobs (cm)0.25"Initial head, hl, (cm)92Final head, h2, (cm)58Elapsed time, t (s)4k@Temp, cm/sk10 (corrected to 10 °C) cm/sPart C:1. Plot the GSD provided for the sample below observed in the constant head(see table)2. Determine the D10 in mm for the sample3. Calculate the hydraulic conductivity using Hazen's formula.(or other by using the linkhttp://www.people.ku.edu/~jfdevlin/Software.html#HYDROGEOSIEVEXL)4. Submit the completed constant and falling head assignment and grain size curve.Table4.SieveSievepercentageretainedNosizecumulative masscumulative(mm)retained(g)cumulative%% passing9.5013044.75230102355200.85385400.4254101000.154802000.075495Pan500D10(mm)K cm/sUSCS

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Engineering

Civil Engineering

Can

Materials Science And Engineering Properties

1st Edition

ISBN:9781111988609

Author:Charles Gilmore

Publisher:Charles Gilmore

Chapter15: Experimental Methods

Section: Chapter Questions

Problem 5CQ

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