بهينه بندي سرعت موج برشي آبرفتهاي گستره تهران

Shear Wave Velocity Zonation In Tehranʹs Alluvium

Preparation of iso-Velocity and Iso-Depth maps for different shear wave velocities in Tehranʹs alluvium is the main subject of this paper. in this regard, data obtained through geoseismic and geotechnical investigations was used. The collected Geotechnical data of about 1000 boreholes including results of 26 new drilled boreholes are considered and combined with the results of 95 refraction surveys and 9 downhole surveys in the studied area. Furthermore the combination of geoseismic surveys, collected geotechnical data and in-situ measurements in drilled boreholes are used to propose a new classification of Tehranʹs soils based on shear wave velocity and N(SPT). A comparison also is made between results of Standard Penetration Test (SPT) in drilled boreholes and shear wave velocities obtained from geoseismic surveys. The new correlations established between N (SPT) and shear wave velocity for different types of fine-grained soils in south of Tehran are proposed.