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Assessment of seismic amplification factor of excavation with support system

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Earthquake Engineering and Engineering Vibration 2019年第3期18卷 555-566页

作者： Hamidreza Tavakoli saman soleimani kutanaei Seyed Hossein Hosseini Department of Civil Engineering Babol University of Technology P.O. Box 484 Babol Iran Department of Civil Engineering Rouzbahan Institute of Higher Education Sari Iran Department of Civil Engineering Hamedan Branch Islamic Azad University P.O. Box 65181-15743 Hamedan Iran

Retaining walls have been used in many construction projects such as for road and inclined surfaces protection. The damage caused by an earthquake depends on the fundamental frequency, amplitude and the duration of the seismic motion. These parameters strongly depend on the seismic properties of the layers that are near the surface. In the study of retaining walls, in addition to the infl uence of soil, the infl uence of topography is also important. In the present study, site response analysis is performed by using fi nite element software PLAXIS to obtain the eff ect of various factors such as embedded length of the sheet pile, underground water table, length and angle of the nail, shear wave velocity of soil on site eff ect and dynamic response. Moreover, for better understanding of the eff ect of the above parameters, the stability analysis was performed by using shear reduction method. The results show that an increase in the embedded length of the sheet pile and the length of nailing causes an increase in the amplifi cation factor. Moreover, for shear-wave velocity in the range of 200- 600 m/s, the amplifi cation factor increases with increase of the shear-wave velocity due to the decrease of nonlinear behavior.

关键词： amplifi cation factor safety factor shear wave velocity nailing sheet pile

Effect of granulated rubber on shear strength of fine-grained sand

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Journal of Rock Mechanics and Geotechnical Engineering 2017年第5期9卷 936-944页

作者： Seyed Mahmoud Anvari Issa Shooshpasha saman soleimani kutanaei Department of Civil Engineering Babol University of Technology Babol Iran

Review of the literature related to the mixture of shredded tire and sand shows that,despite of the increase in shear strength due to addition of tire chips,granulated rubber causes reduction in shear strength of *** this study,the shear behavior of mixtures of fine-grained sand and 1-5 mm granulated rubber is *** direct shear tests were conducted on sandegranulated rubber mixtures with various rubber contents(0%,5%,10%,20% and 30%) at different relative densities(50%,70% and 90%) and different normal stresses(34.5 kPa,54.5 kPa,74.5 kPa and 104.5 kPa).The obtained results show that the granulated rubber improves the shear strength of fine-grained sand at medium relative density and low normal *** degree of improvement in shear strength is a function of rubber content,relative density and normal *** results show that at relative density of 50%,by adding 5% granulated rubber,the internal friction angle of sand increases from 35.1° to 39.2°.However,at relative densities of 70% and 90%,addition of granulated rubber to sand decreases its internal friction *** results also indicate that the behavior of sand becomes more ductile with increasing granulated rubber *** granulated rubber leads to greater yielding strain and less tangent stiffness of *** maximum dilation angle decreases with the decrease in granulated rubber *** stress ratio of sample at critical state(ψ= 0°) decreases with increasing granulated rubber content.

关键词： Granulated rubber Fine-grained sand Relative density Shear strength

Dynamic equivalent soil characteristics identification using earthquake records

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Earthquake Science 2018年第3期31卷 166-173页

作者： Asskar Janalizadeh Choobbasti saman soleimani kutanaei Department of Civil Engineering Babol University of Technology

Techniques for soil property estimation can be categorized into two main groups, in-situ and laboratory methods. Previous investigations indicated that strong ground motions record provides a very useful tool to estimating the in-situ characteristics of soil. The main objective of the present work is to utilize the particle swarm optimization algorithm（PSOA） integrated with linear site response method to obtain the equivalent soil profile characteristics from the available surface and bedrock earthquake motion records. To demonstrate the numerical efficiency and the validity of this approach, the procedure is validated against an available case. Then this procedure is utilized to identify the soil properties profiles of the site by using strong ground motions data recorded during the Bam earthquake of December 26, 2003. The magnitude and PGA of Bam earthquake were MW 6.6 and 0.8 g respectively.

关键词： identification ground response particle swarm optimization algorithm site effect