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Cavity effect on Rayleigh wave dispersion and P-wave refraction

Earthquake Engineering and Engineering Vibration 2021年第1期20卷 79-88页

作者： hossein rahnema Sohrab Mirassi Giancarlo Dal Moro Department of Civil and Environmental Engineering Shiraz University of TechnologyShirazIran Department of Civil Engineering Shahrekord BranchIslamic Azad UniversityShahrekordIran Institute of Rock Structure and Mechanics Academy of Sciences of the Czech RepublicPragueCzech Republic

Sinkholes and cavities can represent serious hazards to human safety and urban infrastructures,cause roadbed subsidence,and so *** is therefore essential to evaluate various sinkholes in different depths and sizes to assess the risk of *** paper evaluates the effect of different cavities on Rayleigh-wave propagation and body(P)wave ***(R)wave propagation is analyzed according to the classical multi-channel analysis of surface waves(MASW)method also considering the R-wave *** seismic traces are computed by means of finite element modeling(FEM)for cavity and intrusion at different depths and ***,field acquisition data is used to verify the detection effect of a cavity on R-and *** results show that the presence of backscattered R-waves and the changes in the R-wave velocity spectrum can help in cavity *** possible evidence is represented by significant changes in the refraction travel times over the cavity *** can be concluded that the field data are in good agreement with the synthetic,and it could be effective to consider the results of both R-and P-wave analysis in order to efficiently identify the cavities.

关键词： R-wave velocity spectrum P-wave refraction cavity intrusion backscattered waves finite element modeling(FEM) MASW method

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Seismic and Geotechnical Study of Land Subsidence and Vulnerability of Rural Buildings

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International Journal of Geosciences 2012年第4期3卷 878-884页

作者： hossein rahnema Sohrab Mirasi Shiraz University of Technology

In recent years, the land subsidence due to different phenomena such as excessive withdrawal of groundwater resources has lead to significant damages to farmlands, residential buildings, roads and transmission lines. Inattention to the land subsidence results in the ruining of buildings which in turn causes the migration of people and imposes financial and social costs on the government. In this paper a case study is performed for Marvdasht plain and rural regions of Fars province, Iran. All affecting parameters and their related damages are considered in the study. The variation of groundwater level and the conditions of rainfall and drought processes in recent years are investigated. The effects of faults and the seismic vulnerability of the regions are also studied by seismic methods. Such factor as groundwater level drop, thickness of clay layers, variation in the thickness of layers at the hillsides and the coincidence of the direction of created cracks and fissures with direction of available faults in the studied area have been investigated as the main factors affecting the soil settlement. At the end of the research, appropriate solutions for the land subsidence prevention and consequently the reduction of the related damages are presented.

关键词： Land Subsidence Fault Surface Cracks and Fissures Iran Withdrawal of Groundwater

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