In 2002, Zeyzoun Dam failure, that is an embankment dam located at the northwest of Syria, made a big Awareness of the effects of the lack of Geotechnical investigations and concern given to seismic design, geological conditions and location of the d
am. Zeyzoun dam location, in the vicinity of the Dead Sea fault system, emphasizes the importance of analyzing the effects of lithological stratum in dam foundations on dam seismic stability. This paper is concerned with the influence of a high permeable soil layer that has different static and dynamic properties, and exists at different depths in dam foundation. Geo-studio software, a Geotechnical program that applies the finite element method and can consider analysis like seepage, dynamic analysis and slope stability, used to build and analyse numerical models. The results of dynamic analysis showed rising of phreatic line level in dam body, amplification in dam dynamic response, increasing in pore-water and excess pore water pressure and decreasing in stability factors of safety, along with decreasing of the thin layer depth.
The subgrade soil reaction can be determined by several experimental methods, in site and in laboratory.
In this paper, the value of subgrade soil reaction Ks was measured and calculated by using the oedometer
test. In addition, the variations of K
s in function of void ratio, applied pressure and time were studied.
Three types of normal consolidated clay soil were tested by using odeometer test. The results show that the
variation of subgrade soil reaction in function of void ratio decreases at the beginning of the test until a
determined value, and then this value increases continuously. This phenomenon can be explained by the
fact that while the applied pressure are near the cohesion strength of the soil, the deformation will be
negligible and the value of Ks is very high, then it decreases until a determined value, and after that this
value increases continuously because the sample can not be deformed any more in the oedometer cell.
The value of subgrade soil reaction is variable in function of void ratio, applied pressure, and settlement
and it decreases in function of plasticity.
For an applied pressure, the value of subgrade soil reaction varies in function of time, where it takes a
very high value at the beginning of loading, and then it decreases gradually in function of time until it
stabilizes at the end of the test.
هدف البحث: إن استخدام الرماد في صناعة السيراميك هو عمل بيئي يسهم في الحفاظ على الموارد الطبيعية، و يساعد في التخلص من النفايات، و يعد خطوة اقتصادية هامة لأنه يخفف من تكاليف صناعة السيراميك إذ إنَّه لا يحتاج إلى عمليات تصنيع مثل الطحن أو السحق.
من هن
ا كان هدف البحث دراسة إمكانية استعمال الرماد، الناتج عن مختلف أنواع الصناعات، بوصفه مادةً أوليةً في صناعة السيراميك المستخدم لتغطية الجدران و الأرضيات.
طرائق البحث : اعتمد البحث على الطرائق التجريبية المخبرية لاستخدام الغضار و الرماد (بنسب مدروسة مخبرياً)، كمواد أولية للحصول على الخلطة اللازمة في عملية تصنيع سيراميك الأرضيات و الجدران. و من ثم تم اختبار كل من المقاومة على الكسر و نسبة امتصاص الماء على العينات المشكلة من هذا الخليط و قارنا نتائج هذه الاختبارات بالمتطلبات العالمية لهذه الصناعة.
النتائج : في هذا البحث تم التوصل إلى تحديد النسب الملائمة لمكونات الخلطة اللازمة لصناعة السيراميك مع تحديد المعايير و البيانات التي تساعد في نقل هذه التكنولوجيا إلى الواقع الصناعي التجاري.
In this paper, ground surface settlement induced by tunneling have been studied
using 2D finite element analysis. By assuming greenfield conditions, which means that
there is no loads on the soil surface above the tunnel.
A FE study was conducted
in which an elasto-plastic constitutive model was adopted
to model the soil behavior (MC,HS).
This paper include Comparison between actual field measurements with (FEM)
results, and parametric study for the most factors that influence ground surface settlement.
The retaining walls are one of most types of engineering constructions and it have
built from natural stones before discovering concrete, Where natural stones have
considered one of the early human materials used in building engineering constructio
ns for
thousands of years, and many facilities in ancient civilization still existing effects so far,
And after the discovery of the concrete and reinforced concrete, the retaining walls which
was built from natural stones diminished relatively
Despite the years this retaining walls has not lost its luster and brilliance, and there
is increased interest in recent years in using new building material which consists of
manufactured stones where used together with traditional construction materials in several
areas both in geotechnical engineering or building … Etc .
This retaining walls present simple technical solutions and it is desirable for aesthetic
reasons and simple implementation and resistance to external conditions,
In addition to being economical solutions limited cost compared to traditional
reinforced concrete retaining walls.
This research deals with the study of the behavior of Segmental Stone Retaining
Walls (SRW) under the static and dynamic loads and parametric study of the most
important factors which influence stability of these retaining walls.
This research studies the effect of the addition of polypropylene
fibers (PF) on the properties of the swelling clayey soil. The effect
of PF on the shear strength of the clayey soil has been studied
and the results show that adding PF, up to spec
ific value,
increases the shear strength. Beyond this value of addition, the
shear strength decreases. The increase in shear strength was
about (100-110) % and the optimal addition ratio was determined.
This paper presents and analyses the results of 2D and
3D numerical simulation conducted for the performance prediction
of TBM tunneling in clay soil.
In this paper the design and development of a device (sensors system) to
study the effect of operational flaws of dowel Albetona engraved:
In order to find the appropriate resistance R factors for the to concrete
bored pile executive defects, whic
h include 15% or less than the cross section of
the to concrete bored pile by conducting tests on miniature models of the pegs
under the influence of horizontal and vertical loads.
This study concentrate on the driven pile in sand soils, to study and inspect this
type of piles via minimized laboratory models in conditions similar to
field conditions, and compare research result with actual load tests.
This study investigated the effect of adding different
percentages of sand to several types of clay soils, Which used as
liners at solid waste landfill sites in order to find the best mixing
ratio (sand - clay).
