Geophysical and geotechnical characterization of shallow subsurface soil: a case study of University of Peshawar and sur
- PDF / 2,143,760 Bytes
- 10 Pages / 595.276 x 790.866 pts Page_size
- 0 Downloads / 174 Views
ORIGINAL PAPER
Geophysical and geotechnical characterization of shallow subsurface soil: a case study of University of Peshawar and surrounding areas Ihtisham Islam 1,2 & Waqas Ahmed 2 & Mehboob Ur Rashid 3 & Azmat Ullah Orakzai 1 & Allah Ditta 4,5 Received: 12 May 2020 / Accepted: 2 September 2020 # Saudi Society for Geosciences 2020
Abstract The proper design and successful construction of engineered structures require determination of the engineering properties of the soil. These properties, however, are conventionally determined in the laboratory using soil samples collected from the construction site. The collection of soil samples is generally an expensive and time-consuming activity, while the extraction of an undisturbed soil sample is difficult. Furthermore, there are wide variations in the temporal and spatial properties of soil and their accurate evaluation requires high-density sampling. Recently, electric resistivity surveying has attracted much attention. It is commonly applied in the analysis of engineering sites, as it is rapid, cost-effective, and non-destructive. Based on this hypothesis, electrical resistivity was measured at four boreholes in the areas surrounding the University of Peshawar using standard methods of resistivity survey, i.e., Schlumberger electrode configuration. The resistivity data that was obtained by vertical electrical sounding (VES) from the fieldwork was correlated with geotechnical data obtained through the analysis of soil samples in the laboratory. Electrical resistivity had an inverse relationship with gravimetric moisture content and cohesion, with the highest regression coefficients observed in the case of GYM-UAP and Girls’ Hostel-UAP (R2 = 0.97 and 0.96) boreholes, respectively. Moreover, electrical resistivity had a significant linear correlation with the angle of internal friction and standard penetration testN (SPT-N) values, with the highest regression coefficient of GYM-UAP (R2 = 0.99) and Girls’ Hostel-UAP (R2 = 0.95), respectively. In conclusion, the obtained relationships between electrical resistivity and different geotechnical properties could be adopted for the assessment of geotechnical properties of soils, especially when many samples are difficult to obtain. Keywords Cohesion . Angle of internal friction . Electrical resistivity . Correlation . SPT-N . Geotechnical properties
Responsible Editor: Zeynal Abiddin Erguler Electronic supplementary material The online version of this article (https://doi.org/10.1007/s12517-020-05947-x) contains supplementary material, which is available to authorized users. * Allah Ditta [email protected]; [email protected] 1
Department of Geology, Shaheed Benazir Bhutto University Sheringal, Upper Dir, Khyber Pakhtunkhwa 18000, Pakistan
2
National Centre of Excellence in Geology, University of Peshawar, Peshawar 25120, Pakistan
3
Geoscience Advance Research Labs, Geological Survey of Pakistan, Islamabad, Pakistan
4
Department of Environmental Sciences, Shaheed Benazir Bhutto University Sheringal, Upper Dir,
Data Loading...
