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Experimental Study of Subgrade Soil Reaction by Oedometer Test

دراسة تجريبية لمعامل رد فعل التربة باستخدام تجربة الأدومتر

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 Publication date 2011
and research's language is العربية
 Created by Shamra Editor




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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.


Artificial intelligence review:
Research summary
تتناول هذه الدراسة التجريبية تحديد معامل رد فعل التربة باستخدام تجربة الأدومتر. تم اختيار ثلاثة أنواع من التربة الطينية المتنوعة في قابلية الانضغاط لدراسة تأثير الضغط المطبق على معامل رد فعل التربة. أظهرت النتائج أن منحنى العلاقة بين معامل رد فعل التربة ومعامل المسامية، وكذلك الضغط المطبق، يتناقص في البداية إلى قيمة معينة ثم يتزايد. يعود ذلك إلى أن الهبوط الناتج يكون صغيراً في بداية التجربة، وعندما يتجاوز الضغط المطبق متانة الترابط يبدأ الهبوط بالتزايد وتبدأ قيمة معامل رد فعل التربة بالتزايد مرة أخرى. كما تبين أن معامل رد فعل التربة يتناقص مع زيادة لدونة التربة. تم إجراء تجارب إضافية لدراسة انضغاطية التربة مع الزمن وأظهرت النتائج أن قيمة معامل رد فعل التربة تتغير بشكل كبير مع الزمن خاصة في بداية التحميل وتستقر عند استقرار الهبوط وتلاشي الضغط المسامي.
Critical review
دراسة نقدية: تُعد هذه الدراسة خطوة مهمة في فهم سلوك التربة الطينية تحت تأثير الأحمال المختلفة، ولكن هناك بعض النقاط التي يمكن تحسينها. أولاً، كان من الأفضل توسيع نطاق الدراسة ليشمل أنواع أخرى من التربة غير الطينية للحصول على نتائج أكثر شمولية. ثانياً، يمكن تعزيز الدراسة بإجراء تجارب ميدانية إضافية لدعم النتائج المخبرية. ثالثاً، لم يتم التطرق بشكل كافٍ إلى تأثير العوامل البيئية مثل الرطوبة ودرجة الحرارة على معامل رد فعل التربة، وهو ما يمكن أن يكون له تأثير كبير على النتائج. على الرغم من هذه النقاط، فإن الدراسة تقدم مساهمة قيمة في مجال الهندسة الجيوتكنيكية وتوفر أساساً جيداً للأبحاث المستقبلية.
Questions related to the research
  1. ما هو الهدف الرئيسي من الدراسة؟

    الهدف الرئيسي من الدراسة هو تحديد معامل رد فعل التربة باستخدام تجربة الأدومتر ودراسة تأثير الضغط المطبق على هذا المعامل.

  2. ما هي أنواع التربة التي تم دراستها في البحث؟

    تم دراسة ثلاثة أنواع من التربة الطينية المتنوعة في قابلية الانضغاط.

  3. كيف يتغير معامل رد فعل التربة مع زيادة الضغط المطبق؟

    يتناقص معامل رد فعل التربة في البداية إلى قيمة معينة ثم يتزايد مع زيادة الضغط المطبق.

  4. ما هي العوامل التي تؤثر على معامل رد فعل التربة وفقاً للدراسة؟

    العوامل التي تؤثر على معامل رد فعل التربة تشمل الضغط المطبق، معامل المسامية، الهبوط، ولدونة التربة.


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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