• Mapúa Institute of Technology

• CE 161 P

Correos, Earon Michael B. PLATE3 CE161P-2/A21 12-04-21 1 Problem: During a constant head permeability test on asampleofsand,150cu.cm.ofwaterwere collectedin2minutes.Thesamplehada lengthof10cm.andadiameterof5.08cm. The head was maintained at 20 cm. a) Compute the coefficientof permeability b) What type of soil is this? c) Compute the seepage velocity if the porosity of soil 0.30. 2 Problem: From the constant head permeability test arrangement shown, the following values are given: Void ratioof specimen........ 0.46 Lengthofsoilsample ...........450 mm Constant head difference .......700 mm Water collected in a period of 3 min = 0.000354 m3 Cross sectional area of soil sample = 0.00226 m2 a) Determine the coefficient of permeability. b) Compute the discharge velocity in m/min. c) Compute the seepage velocity in m/min. 3 Problem: The MMDA in its previous study for a proposedsanitarylandfillsiteinCaviteis planningtouseaclaylinerforthelandfill. Testswereperformedonasampleclay from a borrow site. It was deemed necessarytohaveaminimumclayliner thickness of 0.30 m. The following results were obtained in the laboratory test. Initialwaterlevelinstandpipe… 96cm. Finalwaterlevelinstandpipe…. 56cm. Diameterofstandpipe ... 12mm. Heightofsoilsample................. 10.2 cm. Diameterofsoilsample.............. 5.4 cm. Duration of test.......................... 12 hours. The project manager would like to determine the effectiveness of using on-site day soils for the lining material if it is a favorable.Testswere alsoperformedon the on-site clay and the