Graduate Thesis Or Dissertation
 

An investigation of the influence of root reinforcements on soil strength and the initiation of static liquefaction in forest soils

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/05741w226

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  • A study was conducted to investigate the influence of root reinforcements on soil strength and the initiation of static liquefaction in forest soils. The design and operation was developed of an apparatus capable of modeling rainfall-induced shallow hill-slope failures that also permitted observation of the soil volume change tendencies at failure and at large strains. Fiber reinforced and non-reinforced soil samples were tested in field stress path mode until failure and in undrained constant rate of strain mode after failure. The reinforcements were oriented longitudinally in the soil samples and the samples were failed in extension to mobilize tension in the reinforcements. The pore pressure was gradually increased during field stress path testing by raising the water level in a water column connected in series with the backpressure line in order to simulate a rising water table during rainfall. The test results indicated that the reinforcements significantly increased the pore pressures necessary to initiate soil failure. An analysis of the data suggested that the water table would likely have to be at the soil surface of a hill-slope on a 50 % gradient for the reinforced soil to fail; whereas, the non-reinforced soil could fail with the water table at much lower levels. The soil strength data, along with the fundamental assumptions of the Mohr-Coulomb failure criterion, suggested that a Mohr circle analysis of the reinforced soil data was inappropriate. The preliminary development is presented of a soil strength model that could account for reinforcement potential in terms of specific soil and reinforcement properties and the stress conditions required to cause slippage or breakage of the reinforcements. Static liquefaction was not observed during the soil tests and the soil samples dilated upon failure suggesting a low potential for the initiation of static liquefaction; however, soil volume change tendencies following failure indicated that liquefaction on remolding may be possible at large strains Moreover,the reinforcements seemed to be capable of preventing the initiation of liquefaction on remolding.
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file details Smith__Russell_MS.pdf 2017-08-19 Pubblico Scaricare