Permeability tests can also be conducted on undisturbed specimens. The void ratio, degree of saturation, and dry density are presented in #Table 10.17. Typical test results are given in #Tables 10.15 and 10.16 for falling and constant head permeabilities, respectively. Report the test and take three observations. Otherwise, repeat the test after re-filling the standpipe.ġ0. The time taken to fall from h1 to √h1.h2 and then from √h1.h2 to h2 should be the same. Fill the reservoir again to a higher h1 and note the time taken for the water level to fall to √h1.h2 and then to h2 again.ĩ.
The heads being measured above the center of the outlet.Ĩ. Open the bottom outlet and note down the interval (t) required for the water level to fall from the initial head (h1) to a known final head (h2), Connect the specimen through the top inlet to a selected standpipe of the inside area. Saturate the specimen, by allowing water to flow with a sufficient head through it or by immersion for a high-permeability specimen Īnd by subjecting it to a high head (for a day or two) for the permeable specimen. Assemble the mold, drainage base, and cap along with porous discs (saturate the porous discs before use).Ħ. Remove the collar, level the soil, detach the base plate, and weigh.ĥ. Choose the type of compaction and compactive effort to suit the field condition, and complete the compaction process.Ĥ. Spread uniformly, and allow moisture equilibrium to be attained.Īttach the extension collar, grease the inside of the mold and collar, and keep the assembly on a firm base.ģ. (may be field water content or optimum moisture content depending on the dry density requirement), Take 2.5 kg of a sample (as suggested in the standard compaction test) and the desired water content Miscellaneous apparatus – IS sieves, mixing tray, graduated cylinder, metric scale, stopwatch, 75-gauge wire, thermometer, and source of water. Set of standpipes – glass standpipes of diameter 5 to 20 mm, suitably mounted on a stand (below Fig.).Ħ. Drainage cap – with a porous disc, 12 mm thick, and water inlet/outlet connection to the constant head tank.ĥ. Drainage base – with a porous disc of 12 mm thickness and dummy plate of 12 mm thickness to suit the mold, provided with water inlet/outlet connection.Ĥ. Compaction equipment – suitable dynamic or static compaction equipment.ģ.
Permeameter mold – of 1,000 ml capacity, 100 mm diameter, and 12.73 mm in height.Ģ. There are seven schools, (Porous District of churches) churches, a post office, a police station, a comprehensive health clinic, and various small retail outlets.1. Although all services on the line have ceased, the extensive (for Jamaica) station buildings remain.įuture generations are hoping to rebuild these services better than ever. Rail įrom 1895 to 1992 Porous was served by Porous railway station on the Kingston to Montego Bay line. Porus is on the A2 road which runs from Spanish Town in south central Jamaica to Savanna-la-Mar on the south west coast. Thomas Albert Samuel Manley, father of Norman Washington Manley, one of Jamaica’s National Heroes, was born in Porus in 1852. It is now a thriving community of predominantly small farmers and artisans. In its early days, its population was very small although it boasted a large coffee market. It was described as a “small estate” on the journey from Savanna-la-Mar to Kingston taken by M.G. It was originally called Vale Lionel after the then Governor of Jamaica, Sir Lionel Smith, but was soon renamed "Porous" most probably after the porous soil in the vicinity.
#Porus soil free#
Porus was founded in 1840 by the missionary James Phillippo as a free village for ex-slaves following emancipation.
0 kommentar(er)
