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Register a new userExperimental Study of Subgrade Soil Reaction by Oedometer Test
دراسة تجريبية لمعامل رد فعل التربة باستخدام تجربة الأدومتر
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Damascus University ورقة بحثية
Publication date
2011
fields
Geotechnical Engineering
and research's language is
العربية
Created by
Shamra Editor
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يحدد معامل رد فعل التربة بعدة طرائق تجريبية حقلية و مخبرية و قد تم في هذا البحث اعتماد تجربة الانضغاط (الأدومتر) لتحديد قيمة معامل رد فعل التربة و دراسة تحولاته و العوامل المؤثرة فيه ضمن حلقة الأدومتر. حيث درِست ثلاثة أنواع من التربة الغضارية المنضغطة طبيعياً و المختلفة في قابلية الانضغاط. و قد أظهرت تجارب الانضغاط المنفذة أن منحنى العلاقة بين معامل رد فعل التربة و معامل المسامية (كذلك منحنى العلاقة بين هذا المعامل و الضغط المطبق و علاقته مع الهبوط) يتناقص في البداية إلى قيمة معينة، ثم يتزايد؛ و يعود ذلك إلى أنه في بداية تجربة الانضغاط يكون الهبوط الناتج صغيراً أو مهملاً ما دام الضغط المطبق أقل أو قريب من تماسك العينة (الناجم عن الضغط الطبيعي الذي تعرضت له العينة بالتزايد مرة أخرى و يستمر ks في الموقع) و عندما يتجاوز الضغط المطبق متانة الترابط يبدأ الهبوط بالتزايد، و من ثم تبدأ قيمة هذا التزايد مع تزايد الضغط.
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 Ks 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.
References used
Terzaghi , k , peck , R.B. 1955, Soil Mechanics in Eng. Practice
Daloglu, A.T., vallabhan C.V.G., 2000, values of k for slab on winkler foundation, J. Geotechnical and Geoenviromental Engineering
Terzaghi, K.V., 1955, Evaluation of coefficient of subgrade reaction, Geotechnique
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