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Register a new userMeasurement of Average Shear Wave Velocity by Using Multichannel Analysis of Surface Waves (MASW) Method and It's Relation with Bearing Capacity, Depth of Embedment, Soil thickness
قياس متوسط سرعة أمواج القص باستخدام طريقة متعددة القنوات للأمواج السطحية (ماسو) و علاقتها بقدرة التحمل، و عمق التأسيس، و سماكة التربة
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Damascus University ورقة بحثية
Publication date
2012
fields
Geology
and research's language is
العربية
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Shamra Editor
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يزداد تطبيق طريقة متعددة القنوات للأمواج السطحية (ماسو) في دراسـة المـشكلات الجيوتقنيـة الزلزالية و الهندسية لسهولة تطبيقها و إعداداتها الحقلية، و حفظها للوقت و التكاليف، و تقليلها مـن عـدد السبور. أظهر البحث أهمية استخدام ماسو النشطة و غير النشطة، لقياس متوسط سـرعة أمـواج القـص للطبقات السطحية العليا حتى عمق 30م في مدينة إربد شمال الأردن، و جرى ذلك بجمع نتـائج طريقـة متعددة القنوات النشطة و غير النشطة، فضلاً عن دراسة العلاقة بين متوسط سرعة القـص و المتغيـرات الجيوتقنية الآتية: قدرة التحمل، و عمق التأسيس، و متوسط سماكة التربة.
Multichannel Analysis of Surface Waves (MASW) is increasingly applied in earthquake engineering and geotechnical problems, because of simple field procedures, time and cost saving. It can allow for maximum areal coverage, thus reduces the number of needed boreholes. This study illustrates the importance of the use of active and passive MASW to measure the average shear wave velocities of the upper surface layers (upper 30m) of the city of Irbid in North Jordan by integrating the outputs of the active and passive approaches, and by investigating the relationship between the estimated average shear wave velocity with the following geotechnical variables, Bearing capacity, depth of embedment, and soil thickness.
References used
Alawneh, A. S., 1988. Shear Strength Characteristics of Some Selected Irbid Soil, Master's Thesis, Department of Civil Engineering, Jordan University of Science and Technology, 151p
Bath, M., 1973. Introduction to seismology, A Halsted Press Book, 395pp
Dobrin, M. B. and Savit, C. H., 1988. Introduction to geophysical prospecting, 4th ed.، McGraw-Hill, Inc., 867
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It was found in this research that the seismic response of the
structure increases with the decrease in the shear waves velocity in
the soil, and the seismic response of the structure increases with
soil layer thickness between the foundations of the structure and
bedrock depth.
This research study aims at investigating the potential benefits of using the
reinforcement to improve the bearing capacity and reduce the settlement of strip footing on
clay. To implement this objective, many numerical 2D-analyses by finite elemen
t method /
Plaxis program were performed to study the behavior of reinforced soil foundation. And
then we carry out a parametric study of the most effective parameter on bearing capacity.
The results showed that the inclusion of reinforcement can significantly improve the soil’s
bearing capacity and reduce the footing settlement. The strain developed along the
reinforcement is directly related to the settlement. The results also showed that the
inclusion of reinforcement can redistribute the applied load to a wider area, thus
minimizing stress concentration and achieving a more uniform stress distribution. The
redistribution of stresses below the reinforced zone can result in reducing the settlement of
the underlying weak clayey soil.
In this work, six different samples of the Al2O3 / CdO system were prepared in a
co-precipitation method. Samples were prepared from saturated solutions for cadmium and
aluminum salts using concentrated ammonia as a precipitating agent at pH = 8 an
d after
settling and drying the sample was calcined at 400°C for two hours.
In order to studied the surface acidity by temperature programmed desorption (TPD)
method. The calcined sample was divided to two parts: The TG-DTA measurements was
carried on for the first part in order to determine the loss weight using thermal program in
the range 20-900°C and 10°C/min. The second part was impregnated in pyridine for 24h,
and dried at 120°C to remove the physical adsorbed pyridine and the TG-DTA
measurements were performed at the same conditions for the first part.
Differential curves were studied to calculate the weight loss produced by the
desorption of pyridine. The AC8 (1-1) showed the highest surface acidity value
(0.47m.mol / g), while the sample AC8 (1-0.25) gave the lowest acidity surface value
(0.11m.mol / g).
In present investigation attempt has been made to study the bearing capacity and settlement
characteristics of footings subjected to central vertical load and resting on layered soil with
the help of model tests and with the application of finite e
lement method (FEM) to
calculate bearing capacity of a strip footing on one-layer and two-layer soil (Sand and
Clay). To investigate the effect of various parameters on soil bearing Capacity a
commercial finite element software, PLAXIS, has been used. Soil profile contains two soil
types including sand and clay. Soil behavior is represented by the elasto-plastic Mohrcoulomb
(MC) -model. For a one-layer case, the bearing capacity also is calculated which
has a good agreement with theoretical equations. For a layered soil, soft-over strong soil,
parametric study was carried out. It is concluded that the bearing capacity of footing
decreases as the height of clayey soil increases whilst the displacement under footing
increases. There is a critical depth where the stronger bottom layer does not affect ultimate
bearing capacity and failure mechanism of footing.
A field experiment was conducted for two years 2011-2012 to evaluate the effect of various tillage implements, tillage depths and nitrogen fertilizer timing application on soil bulk density, its moisture, and peanut growth. Three different implements
were used: moldboard (MP), chisel (CP) and disk ploughs (DP). Tillage depth treatments (split-plots) included (8-10) cm, (18- 20) cm and (28- 30) cm tillage depths; D1, D2 ,D3 respectively. Timing applications (split-split- plots) were: T1 all nitrogen fertilizer applied at planting ,T2 half nitrogen applied at planting and half at flowering ,T3 all nitrogen fertilizer applied at flowering.
All tillage implements decreased soil bulk density for the tillage depth. They were for treatments (DP,CP,MP) at (0-10)cm depth (1.31,1.33,1.29) g/cm3, (1.31,1.32,1.31) g/cm3 at (10-20) cm depth and (1.36,1.37,1.35)g/cm3at(20-30) cm depth. Soil moisture increased in treatments (DP,CP) with increasing tillage depth .There was no effect of previous factors on main branches, but timing of nitrogen fertilizers (T1, T2) effected secondary branches significantly compared to T3. Moldboard significantly increased leaf area to (1.77) m2/plant compared to chisel (CP) and disk ploughs (DP). Also D2, D3 increased leaf area compared to D1. (T1, T2) significantly increased leaf area compared to T1. Interaction between timing of application and depth (D3 xT2) gave significant differences. The best value was (1.85) m2/plant for the two years.
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