مقالههای Ehsan Seyedi Hosseininia
توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقالههای نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده میشوند.
۱The Effect of Particle Crushing and Confining Pressure on the Mechanical Behavior of Granular Materials Using DEM
اطلاعات انتشار: هفتمین کنگره ملی مهندسی عمران، سال ۱۳۹۲
تعداد صفحات: ۷
One of the important problems in geotechnical engineering is the evolution of granular soil behavior as a result of particle breakage. By using Discrete Element Method (DEM), a model is established to simulate the breakage of two–dimensional rectangle–shaped particles. In simulations, the particles are supposed to be able to be fragmented into two pieces. In fact, each particle consists of two sub–particles bonded with each other. Particle crushing will occur during the numerical analysis if the bond between these sub–particles breaks. With this model, the effect of particle breakage on macro mechanical behavior of granular materials can be studied. Two series of biaxial tests, with and without breakable particles, are simulated under different confining pressures and the results are compared. The results are represented in terms of deviator stress and volume change regarding to different confining pressures. It is observed that particle crushing has a major influence on the mechanical behavior of granular materials like a decrease in both deviator stress and volume change. In addition, similar to the case of unbreakable particles, higher confining pressure leads to an increase in deviator stress and a decrease in dilation in the assemblies with breakable particles.<\div>
۲Significance of Soil Compaction on Blast Resistant Behavior of Underground Structures: A Parametric Study
اطلاعات انتشار: Civil Engineerng Infrastructures Journal، چهل و هشتم،شماره۲، Dec ۲۰۱۵، سال ۰
تعداد صفحات: ۱۴
Dynamic response of underground structures has always been a topic of concern for designers and researchers. The behavior of these complicated systems under blast loading is affected by various factors and parametric studies are required to investigate their significance. The importance of soil density around the underground structure through which, the waves of explosion of a penetrator bomb is transferred, has been studied in this paper by using finite difference method (FDM). According to the results, soils with higher degrees of compactioncan absorb explosion energy more significantly. Therefore, the displacements and stresses of underground structure lining in denser soils are moderately lower. Thebending moment of the lining should be given attention, as regards being a critical design parameter.
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