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Compression of fibrous peat MacLeod, Donald Graeme Gordon

Abstract

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.

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