الاختبارات المعمليه للتربه

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Presentation transcript:

الاختبارات المعمليه للتربه

محتوي الرطوبه Water content محتوى الرطوبه للتربه Wc%:-

الوزن النوعى للتربه Gs طريقة قنينة الكثافه: الادوات المستخدمه و تستخدم للتربه الناعمه الادوات المستخدمه 1- قنينة كثافه سعة 50سم3 2- فرن حرارى عند 105الى 110 درجه مئويه 3-ميزان حساسية 0.01 جرام

التحليل المنخلى Sieve analysis منحنى التدرج الحبيبى Particle size distribution هى العلاقة التى تربط بين قطر الحبيبات التربه (بالمم) و نسبة المار من هذه التربه P% بالمناخل القياسيه فتحة المنخل (مم) رقم المنخل 0.149 100 2.88 7 50.80 2“ 0.075 200 1.41 14 38.1 1.5“ 0.707 25 19.05 3/4“ 0.42 40 9.51 3/8 ” 0.21 70 4.76 4

شكل المنخل القياسى مجموعة من المناخل القياسيه بالهزازالكهربى

كيفية حساب نسبة التربه الماره من المناخل القياسيه

رسم منحى التدرج الحبيبى

حدود القوام و مجالات اللدونه للتربه (حدود اتيربرج) 1- حدود القوام للتربه (حدود اتيربرج) هى الحدود الفاصله بين مراحل القوام التى تمر بها التربه من الجفاف مع اضافة المياه للوصول الى السيوله و تعين للتربه الناعمه فقط مثل الطمى و الطين. حد السيوله حد اللدونه حد الانكماش

حد السيوله Liquid Limit (LL) حد السيوله هو اقل كميه مياه تكون بعينة التربه بخيث لو قلت عن هذا الحد تتحول الى خالة اللدونه او هو الحد الفاصل بين حالة السيوله و حالة اللدونه فى التربه. طريقة كازاجراند (Casagrande method) الجهاز المستخدم خطوات التجربه تعيين حد السيوله طريقة جهاز فاسيلياف: