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RISS 인기검색어
- 검색키워드
- 저자 : Karami Khaniki Ali (검색결과 2 건)
- 무료
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- 유료
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Analytical and Experimental Approaches to Obtain the Ultimate Strength of Reinforced Earth Elements
Ali Karami Khaniki,Farzad Daliri 대한토목학회 2013 KSCE JOURNAL OF CIVIL ENGINEERING Vol.17 No.5
From the early 1960’s when reinforced earth was introduced by Henri Vidal, much research has been carried out with the aim of estimating the improvement in shear strength of reinforced earth compared to that of unreinforced soil. This paper aims to find the maximum vertical pressure that the soil element can withstand while a lateral pressure is applied to the element. An analytical approach based on the enhanced confining pressure concept as well as some experiments employing triaxial test to determine the ultimate strength of reinforced earth seawalls are proposed. If the soil element is unreinforced, the maximum vertical stress can be easily obtained by multiplying the lateral pressure by the passive pressure coefficient, but for a reinforced element an additional term due to the effects of reinforcement must also be considered. In addition to analytical approach, triaxial tests were performed to examine the behaviour of reinforced and unreinforced sand elements in an undrained fully saturated condition. In conclusion,under low failure pressures (10-20 kPa) the reinforced soil has an internal friction angle higher than that for unreinforced sand, but under higher failure pressures (100 kPa) the internal friction angle of both unreinforced and reinforced sand remains the same.
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Siahsarani Amir,Karami Khaniki Ali,Aliakbari Bidokhti Abbas-Ali,Azadi Majid 한국해양과학기술원 2021 Ocean science journal Vol.56 No.3
A storm surge is a complex phenomenon in which current, tide, and waves interact with each other. Even if the wind is the main force of driving the surge, waves and tide are also key factors that affect the momentum and mass transport during the storm surge. Although, the Iranian Makran coastal region in the Gulf of Oman is vulnerable to storms and coastal hazards, the interaction of waves on the storm surge has not yet been studied in this region. This paper aims to investigate tropical cyclone-induced waves and storm surges in the Gulf of Oman through the wave-tide-circulation coupled system. The simulations were carried out using the two-way coupling of wave and hydrodynamic models (MIKE 21 SW + MIKE 3 HD) to compute the wave characteristics and water levels during the super cyclone Gonu, which were validated with the field measurements. Model results, and in particular the water level and significant wave height, agreed well with the observations during the Gonu storm’s period. Also, the influences of the key factors interaction (wind, atmospheric pressure, and wave) on a storm surge in the Iranian Makran coasts were evaluated. First, there is a peak surge caused by winds, after that the surges induced by the wave and atmospheric pressure. The wind, pressure, and wave have a contribution of 77.9%, 22.3%, and 10.3%, respectively, in inducing the peak surge of the storm. Key findings of this study indicate the importance of wave-induced setup due to radiation stress as well as the role of the coupled model inaccurate storm surge simulation.
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