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۱Seismic Evaluation of Liquefaction Potential of Soil Interacting by Single Pile
نویسنده(ها): ،
اطلاعات انتشار: اولین کنفرانس ملی مکانیک خاک و مهندسی پی، سال
تعداد صفحات: ۸
Previous studies show that liquefaction induced large lateral displacement has imposed severe damages to many structures supported on pile foundations during earthquakes. So, evaluating the potential for instability caused by the development of excess pore pressure is an important consideration to safe and resistant design of deep foundation against this event. In this study the liquefaction potential of saturated sand interacting by single concrete pile and the dynamic behavior of pile simulates by means of finite difference method. A nonlinear effective stress analysis is used to evaluating soil liquefaction and the soil–pile interaction is considered by using interface elements. The parameter Ru was defined as the pore water pressure ratio to investigate liquefaction in the soil mass during time. A set of numerical models carried out by three types of soil mass with various condensation (loose, semi–dense and dense) under three ground motion with different predominant frequencies and peak accelerations. Effect of these parameters is studied by the excess pore pressure, lateral movement and settlement time histories of liquefiable deposits at near pile and free–field. It is found that for various soil and various earthquake characteristics, the depth of soil liquefaction and it’s triggering, varies.<\div>

۲Numerical simulation of liquefaction susceptibility of soil interacting by single pile
نویسنده(ها): ،
اطلاعات انتشار: International Journal of Mining & Geo-Engineering، چهل و نهم،شماره۱، ۲۰۱۵، سال
تعداد صفحات: ۱۰
Previous case histories have shown that soil liquefaction severely damaged many structures supported on pile foundations during earthquakes. As a result, evaluating the potential for instability is an important consideration for the safe and resistant design of deep foundation against earthquakes. In this study, the liquefaction susceptibility of saturated sand interacting by single concrete pile was simulated by means of finite difference method. A nonlinear effective stress analysis was used to evaluate soil liquefaction, and the soil–pile interaction was considered using interface elements. The parameter Ru was defined as the pore water pressure ratio to investigate liquefaction in the soil mass during time. A set of numerical models were carried out by three types of soil mass with various condensation (loose, semi–dense and dense) under three ground motion with different predominant frequencies and peak accelerations. The effect of these parameters was studied using excess pore pressure, lateral movement and settlement time histories. It was found that the pile can affect the liquefaction susceptibility of soil by comparing the near pile and free field responses. However, for various soil and earthquake characteristics, it was found that the depth of soil liquefaction and triggering, varies.

۳Effects of statistical distribution of joint trace length on the stability of tunnel excavated in jointed rock mass
نویسنده(ها): ، ،
اطلاعات انتشار: International Journal of Mining & Geo-Engineering، چهل و نهم،شماره۲، ۲۰۱۵، سال
تعداد صفحات: ۸
The rock masses in a construction site of underground cavern are generally not continuous, due to the presence of discontinuities, such as bedding, joints, faults, and fractures. The performance of an underground cavern is principally ruled by the mechanical behaviors of the discontinuities in the vicinity of the cavern. During underground excavation, many surrounding rock failures have close relationship with joints. The stability study on tunnel in jointed rock mass is of importance to rock engineering, especially tunneling and underground space development. In this study, using the probability density distribution functions of negative exponential, log–normal and normal, we investigated the effect of joint trace length on the stability parameters such as stress and displacement of tunnel constructed in rock mass using UDEC (Universal Distinct Element Code). It was obtained that normal distribution function of joint trace length is more critical on the stability of tunnel, and exponential distribution function has less effect on the tunnel stability compared to the two other distribution functions.
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