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Register a new userدراسة مواصفات التربة الانتفاخية في محافظة درعا
1949
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تهدف هذه الدراسة إلى التعرف على مواصفات الترب الغضارية لعـدد مـن المواقـع فـي الجنوب السوري و ذلك من حيث التركيب الكيميائي و الخواص الفيزيائية و الميكانيكية. و مـن نتائج هذه الدراسة قمنا بتطبيق التصنيفات العالمية للترب الغضارية ( جـداول, منحنيـات, نماذج رياضية) على ترب المنطقة المدروسة, و من مقارنة النماذج الرياضية العالميـة مـع نتائج دراستنا المخبرية قمنا باقتراح نموذج رياضي يربط بين طاقة الانتفاخ و قرينة اللدونة، و آخر يربط بين قرينة الانكماش و طاقة الانتفاخ. و من ثم تحديد موقع هذه التـرب بالنسـبة للتصنيف العالمي للترب الانتفاخية.
No English abstract
References used
Geotechnical and Foundation Engineering, By Robert,1999
Foundation Of Soil Physics, By Daniel Hill,1980
Properties of Compacted Clay, By Olsen,1970
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The study was carried out at Soil Research Center in the province of Daraa
during 2011 in order to study some physical and moisture characteristics for
cinnamon soil, which occupies (48000 km²), equivalent to 26% of the area of the
Syrian Arab Rep
ublic and represents the cultivation of growing field crops
with a rainfall ranges between 150- 300 mm. The results showed that the
mechanical analysis for soil referred that its texture is clay with a good ability
to retain water, the field capacity rated between (30-38.85)%. The studied soil
has high value of available water (38.93mm) and useful water (25.69mm) in the
surface layer. The highest value of permanent wilting point and hygroscopic
moisture was reached in the final depth in studied profile soil, It was also
distinguished a high total porosity ranged between 51.78 and 55.59% with
a good air porosity amounted to 9.38 - 15.47 % in different depths and with the
decline to 5.51 % in the depth 30 - 45cm.
Inhabitants' increase in the governorate of Daraa has great effect on civil
development, as it is the case in other governorates of Syria, this is quite evident
in the increase of inhabitants in civil centers, and its horizontal extension
continuo
usly.
Due to the importance of this subject, I studied it, where the research
included a survey of its problem that the continuous inhabitants' increase has
been the cause of the increase of the number and volume of civil centers during
the period between 1970-2010, where the rate of civilization increased by 14.3%
to 41.6% The number of inhabitants in the governorate is expected to reach
(1.631.005) inhabitants in the year 2025. that's with an increase of 505.005
inhabitants. The research included its importance, objective and courses, the
developed number of inhabitants in the governorate, and effective factors that
affect it, with the increasing number of civil centers. In addition to studying
indications of civil development such as education, health, culture, services,
industry, housing, then discussed their problems and impediments, such as the
increasing rates of inhabitants, the random housing, environmental pollution,
then presenting future suggestions and solutions for them.
A survey to record the genera of nematodes associated with chickpea of
domestic variety, which are planting at Izra’a Research center in Dara’a
Governorate, was carried out during the period from April 2003 till June 2003.
Nematodes were extracted
, examined and identified to genus. Population
density, frequency (%), and prominence value (PV) were calculated for each
genus of 40 samples were collected from the root rhizosphere soil and from
plant roots itself. Results showed that eight genera of plant-parasitic
nematodes, and seventeen genera of other nematode groups were associated
with chikpea plants.
The purpose of this research is to study the improvement of soil properties by the
addition of lime in certain percentages. The soil used in this study was obtained from the
Baseet region, which is located by the Syrian coast. We have studied the e
ffect of lime on
the consistency, the swell characteristics and the shear strength of soil.
The results of this study have shown a remarkable reduction of both liquid and
shrinkage limits, and the plasticity index with the increase of lime percentage. As for
plasticity limit, it increases in the beginning then decreases slightly with the rising of lime
percentage.
For the volumetric variation, the susceptibility of swelling and the shrinkage of
improved soil with lime decrease, and the free swelling and the swelling pressure become
almost negligible with 4% of lime.
Based on the shear strength results, we can indicate a notable increase in the friction
angle and cohesion of soil with increasing of lime percentage up to 8% of lime. After that,
these two factors decrease.
A field study has been carried out in order to know the important species
belonging to the family Syrphidae Diptera . in some field in Ezraa & jellien of
Daraa governorate during the period 1/3 /2003 till 30/8/2003 .
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