تور آنتالیا میز اداری آموزش وردپرس صندلی مدیریتی صندلی اداری تبلیغات کلیکی میز تلویزیون پاراگلایدر آگهی رایگان خرید اینترنتی وبلاگدهی گن لاغری ساخت اپلیکیشن

INVESTIGATION OF COMPRESSIBILITY CHARACTERISTICS OF ADDIS ABABA (GELAN) SUBCITY SOILS FOR SHALLOW FOUNDATION DESIGN INPUT (Illustration and Comparison using different Building Codes)

Alex Atanaw Alebachew

Abstract


Any engineered structures constructed on the soil need to respond safely for static and dynamic loading to insure the bearing capacity and compressibility characteristics of the soil. Unbalanced load of soil leads excessive structural distortion and mass collapse against shear failure and excessive settlement which result, structural damage to building frames, cracks, sticking of doors and windows. The unbalanced super structural load is factored to account several factors among these are soil types on which foundation laid on, foundation shape, and depth and design approach using different codes. This study tried to determine the compressibility characteristics of southern Addis Ababa sub city (Gelan) soils with illustration of different codes and the evaluation of Ethiopian building code compared to other codes.

From disturbed samples dry sieve analysis, moisture content, specific gravity, bulk density, Atterberg limits, unconfined compressive strength; direct shear test and consolidation tests and free swell test were done using undisturbed samples. From the test results, drained cohesive strength was 10.5-21kN/m², angle of internal friction ranges from 15-23º, undrained cohesive strength was 35.7-68Mpa, swelling index/recompression index and coefficient of compressibility range was 0.037-0.071and 0.214-0.286 respectively. It is known that the expansive potential of the soil depends on the swelling pressure fully and it is observed in all the study area that the soils are under medium expansiveness and are grouped under Kaolinite clay type with the values swelling index of 40-78% and swelling pressure 60-89kpa with initial moisture content of 29-39.1%.Using these test results,

Settlement values determined by EBCS-7 are conservative and demands some revision to make it more economical. The study suggests that the method of estimating should need further investigation and relevant revision has been made in EBCS-7.


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ISSN : 2251-1563