Diss. (sammanfattning) Umeå : Sveriges lantbruksuniv., 2001. / Härtill 4 uppsatser.

Originally submitted as Thesis (Ph. D.)--University of Minnesota, 1917. / Published also as: The peat deposits of Minnesota / by E.K. Soper. Minneapolis, University of Minnesota, 1919. (Bulletin / Minnesota Geological Survey ; no. 16). Four maps on 4 fold. leaves in pocket.

Originally submitted as Thesis (Ph. D.)--University of Minnesota, 1917. / Published also as: The peat deposits of Minnesota / by E.K. Soper. Minneapolis, University of Minnesota, 1919. (Bulletin / Minnesota Geological Survey ; no. 16). Four maps on 4 fold. leaves in pocket.

Thesis (Ph. D.)--University of Minnesota, 1917. / Bibliography: p. 254-256.

A detailed discussion of the consolidation process of peats is presented with suggested testing procedures for determining the consolidation characteristics, specific gravity, void ratio, moisture content, side friction and permeability. Particular attention is directed to secondary consolidation effects which are discussed with reference to test results on two types of peats. The results from ten consolidation tests consisting of seven tests (2.5 inches diameter by 1 inch original height) on two types of peat, and three tests (8 inches diameter by 5 inches original height) on an amorphous peat are presented. A side friction measuring apparatus is described and experimental results of side friction measurements are presented. A pore pressure probe is described and evaluated as to experimental results of pore pressure measurements, permeability measurements and a rapid method of pore pressure determination during secondary compression. A graphical method of separation of primary and secondary compression is presented and described. Three topics are outlined as possible future research that will increase the understanding of the consolidation characteristics of peat. / Applied Science, Faculty of / Civil Engineering, Department of / Graduate

Peat is well known for the engineering problems it poses especially in the field of settlement analysis. his This mainly because the process and therefore the factors affecting secondary settlement are as yet little understood. A preliminary laboratory investigation was carried out to examine the relationship between settlement and load for fibrous peat using different load increment rat i os and load durations. Three load increment ratios were used (3.0; 1.0; 0.33) and two durations of load (15 mins and 24 hours). The tests were performed in a consolidation apparatus using fixed rings 2.50 ins inside diameter and 0.750 ins in height. Undisturbed specimens were cut from one horizontal layer of a lump sample of fibrous peat having a water content of 1100% Within the limits of this preliminary investigation the main conclusions were: (1) all load increment ratios and load durations gave very similar settlement - log p or e-log p curves providing settlement was measured at the 100% primary consolidation point. (2) the rate of secondary settlement was independent of load increment ratio and load duration except for the type ii curve which appeared to be affected by the duration of the previous load increment. (3) only one test (#2, l.i.r. 0.33, l.d. 24 hours) gave a type ii settlement. log time curve. curve type appeared to depend on both load increment ratio and load duration or rate of loading. this test also took about 10 times as long to reach the 100% primary consolidation point. (4) the hypothesis of a unique settlement-log p curve at 100% primary consolidation for the load cycle regardless of previous loading history appeared to offer a plausible general interpretation of the results of the test series. / Applied Science, Faculty of / Civil Engineering, Department of / Graduate

Thesis (M.S.)--University of Wisconsin--Madison, 1966. / eContent provider-neutral record in process. Description based on print version record. Bibliography: l. 50-51.

M.Sc. / The objectives of this thesis were to map, categorise and document the peat resources of Maputaland in terms of: • extent and distribution of peat occurrences • description of peat types • a proximate analysis of the energy content • chronology: C 14 ages and accumulation rates • utilisation of the peat resource. The study area is situated in Maputaland, on the northern KwaZulu-Natal coastline and is confined by the South African-Mozambique boundary in the north, the Indian Ocean in the east, the Mfolozi River in the south and the Lebombo Mountains in the west. Peatlands were identified and delineated on 1 :50 000 maps and aerial photographs. Peat cores were taken to describe peat profiles and cross-sections. The physical characteristics of the peat were described in the field according to colour, moisture content, fibre length and fibre content and compared with the Von Post humification scale. Selected samples were C14 dated and the C14 ages used to determine peat accumulation rates and to characterise the peatlands together with calorific value (MJ/kg) (air-dried samples) and proximate analysis. Two hundred and sixty-six peatlands were investigated during this study. Peat thicknesses varies from 0.5 to 10m and wetlands vary in size from a few hectares up to 8 800 ha. The peat resource is inferred to be 158-million m3 moist peat and it comprises 60% of South Africa's peat. Peatlands occur in areas where the rainfall exceeds 600 mm/year and at elevations between sea level and 50 m above mean sea level.

No description available.

No description available.