Proceedings of DFI-India 2019: 9th Conference on Deep Foundation Technologies for Infrastructure Development in India, (DFI)
Comparison of Geophysical and Geotechnical Investigations of a Deep Soil Site in Indo Gangetic Plains
Priyanka Sharma, Ph.D., M. L. Sharma and V. A. Sawant, Ph.D.
There has been a renewed interest for sub surface characterization of soil and shear wave velocity measurement using various geophysical methods involving different techniques, testing configurations and inversion methods. The most widely- used geophysical method in earthquake geotechnical engineering is MASW (Multichannel Analysis of Surface Waves) and Horizontal-to-Vertical Curve (H/V) from Microtremor studies. Roorkee city falls in seismic zone IV in the state of Uttarakhand (India) and is located in the vicinity of Himalayan Frontal Fault (HFT). The presence of thick alluvium makes it more vulnerable to seismogenic sources and hence, its characterization is required. Joint fit inversion technique was used to obtain the shear wave velocity profiles. Moreover, the results of this geophysical methods are compared with the available geotechnical investigation of the site. It was observed, that the shear wave velocity obtained from MASW and Microtremor is in good agreement with those obtained from the bore logs data. Hence, both the geophysical and geotechnical investigations are complementary to each other and results of one method can serve as a guideline for the other method.
|article #3299; publication #1059 (India2019)|