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ITS » Master Theses » Geoteknik S2 Posted by eny at 13/01/2007 13:49:27 • 30739 Views
DETERMINATION OF AT-REST LATERAL PRESSURE COEFFICIENT Ko OF FIBROUS PEAT SOIL
Author : Wismantara, I Gusti Ngurah Nyoman
One of the most important soil parameters to design bearing capacity of a deep foundation is at rest lateral pressure coefficient Ko. Ko is the coefficient of lateral earth pressure under condition of no lateral deformation. For sand and clay soils the Ko value can be obtained using mathematics formula it is a function of an effective internal friction angle or plastic index PI of the soil. For peat soil however the Ko value can not be determined using the mathematics formula developed for sand and clay soils mention above. It has to be measured directly from laboratory test using a Ko-test tube. Unfortunately that apparatus is not available in the market.
Due to that reason the first step of the research carried out herein is to build the Ko-test tube apparatus afterward it is used to determine the Ko value of peat taken from Pekantua Riau.
The Ko-test tube was built as suggested by Abdelhamid and Krizek 1976 it was calibrated with water to determine the relationship between horizontal strain of the Ko-test tube wall and radial stress. By using the apparatus the Ko of sand was determined the result obtained is then compared to the Ko obtained from Jakys formula. Whenever that apparatus gave a satisfactory result of Ko the testing was carried on for peat soil. In this research the vertical load chosen for the test was 50 KPa 100 KPa 200 KPa and 400 KPa for loading and unloading conditions.
The results show that the calibration result of the Ko-test tube can be expressed as linear equation that is r 2.98 x 106 e average r in KPa. The Ko of sand determined using the Ko-test built is comparable to that obtained using Jakys formula that is 0.46. Under loading condition the Ko value of peat is constant 0.32 under unloading condition the Ko is not constant but it is function of OCR in which the increase of OCR is companied with the increase of Ko the Ko is variase between 0.32 - 0.44. The relationship between the Ko and OCR can be expressed as a parabolic equation Ko 04757 OCR01579 for sand and Ko 0321 OCR61494 for fibrous peat from Riau.
Source Theses Civil Engineering RT 624.151 36 Wis p, 1998
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