پديد آورنده :
طهماسبي، منا
عنوان :
تعيين رابطه بين تنش پيش - تراكمي و مقاومت برشي خاك و طراحي دستگاه اندازه گير مقاومت برشي در مزرعه
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
﴿مكانيك ماشين هاي كشاورزي﴾
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده كشاورزي
صفحه شمار :
پانزده، 121، [II]، ص.: مصور، جدول، عكس، نمودار
يادداشت :
ص. ع. به فارسي و انگليسي
استاد راهنما :
عباس همت، محمود و فائيان
توصيفگر ها :
روش ادومتر , بوامتر , دستگاه برش پيچشي ، پره برشي , پنانسيو متر
استاد داور :
حسين خادمي، مرتضي صادقي
تاريخ ورود اطلاعات :
1396/02/30
چكيده فارسي :
به فارسي و انگليسي : قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
AbstractDetermining stress limits to prevent soil compaction it is important to know themechanical properties of soils One important parameter is the precompression stresswhich is often used as a criterion for soil susceptibility to compaction The objectives ofthis study were to 1 compare precompression stresses derived from plate sinkage test PST and confined compression test CCT and relate these values to soil shearstrength obtained from shear box and 2 design a torsional shear box for determining theshear strength of the topsoil In this research a series of pre and main tests were done ona sandy loam soil The objectives of pre tests were to make uniform soil samples and toobtain suitable pre loading method In main tests the effects of two moisture contents 17 and 19 db and six pre loading stresses 0 25 50 100 150 and 200 kPa on pre compaction stress using a factorial experiment in a completely randomized design withthree replication were studied Compressive loading types consisted of plate sinkage test PST and confined compression test CCT The initial soil conditions for PST CCTand direct shear tests were similar The results showed that although a positive andsignificant R2 0 71 correlation between the pre compaction stress was obtained withboth loading types the pc predicted with PST was accurate whereas the value obtained with CCT were 4 5 17 db and 8 5 19 db times higher the applied pre loadings The relationships between the pre compaction stress and the correspondingshear strength for both PST and CCT were linear R2 0 95 and significant P 0 01 The pre compaction stress values depend on the compressive loading tests however the corresponding shear strength had positive and linear relationship with pc Therefore for pre compaction stress determination by semi confined plate sinkagetest and the corresponding by shear strength determination by direct shear test arerecommended
استاد راهنما :
عباس همت، محمود و فائيان
استاد داور :
حسين خادمي، مرتضي صادقي
