Investigation on Some of The Engineering Characteristics of Soils in Tiya Town, Ethiopia
No Thumbnail Available
Date
2015
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Addis Ababa University
Abstract
The aim of this thesis is intended to investigate some of the engineering properties of Tiya soil.
Tiya is a megalithic site located at about 80km south of Addis Ababa in the Soddo area on the
road to Butajira.
In addition to being tourist center, investors are also attracted to construct buildings and roads in
Tiya town and the nearby areas. However, the engineering properties of the soil in the town are
not yet studied. This research is therefore directed to the study of the physical and mechanical
properties of soils i.e. investigating the index properties, consolidation characteristic, and shear
strength, identifying the characteristics of the soil and preparing a tentative soil map of the town.
After visiting the proposed site, ten test pit points were selected. Representative disturbed and
undisturbed soil samples were collected from open pits by direct manual excavation. The
laboratory tests that were carried out include index properties, one dimensional consolidation,
shear strength tests. The tests yielded a specific gravity ranging from 2.42 to 2.67, plasticity
index ranging from 18 to 51%, clay fraction ranging from 17.08 to 55.51%, free swell values
from 34 to 102.5%.
From one-dimensional consolidation test conducted on undisturbed soil samples, compression
index, Cc, ranges from 0.218 to 0.246 and measured swelling pressure of 250kPa.
The unconfined compression strength tests gave value that range from 84 to 313 kPa at natural
water content ranging from 27.25 to 49.07 %.
The types of soils which are conducted in the research are CH, MH, ML and CL for the depth of
0.7m, 1.5m & 3m that is shown on the soil map. Low, Marginal and Highly potentially expansion
soils according to free swell tests are presented on the tentative soil map.
Description
Keywords
Soils Engineering