scholarly journals Empirical Correlation between Geotechnical and Geophysical Parameters in a Landslide Zone (Case Study: Nargeschal Landslide)

2018 ◽  
Vol 22 (3) ◽  
pp. 195-204 ◽  
Author(s):  
Sadegh Rezaei ◽  
Issa Shooshpasha ◽  
Hamed Rezaei
Keyword(s):  
Electrical Resistivity ◽  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Geophysical Methods ◽  
Field Investigation ◽  
Least Square ◽  
Geotechnical Investigations ◽  
Geophysical Techniques ◽  
Landslide Zone

Today, geotechnical and geophysical techniques are used for landslide evaluation. Geotechnical methods provide accurate data, but are time consuming and costly. Geophysical techniques, however, are fast and inexpensive, yet their accuracy is lower than that of the geotechnical methods. Therefore, simultaneous use of geotechnical and geophysical methods provides a suitable solution for landslide evaluation. Availability of geotechnical and geophysical data makes it possible to investigate correlation between different parameters. Correlating geotechnical and geophysical parameters ends up lowering field investigation costs and enhancing subsurface survey speed in a landslide zone. In the present study, in order to evaluate Nargeschal landslide in Iran, ambient noise measurement, ERT survey, and geotechnical investigations were used. Once finished with data processing, the data obtained from geotechnical and geophysical investigations were correlated. These included SPT-N – electrical resistivity, soil moisture content – electrical resistivity, and SPT-N – shear wave velocity correlations. The correlations were examined using two methods, namely Spearman’s coefficient test and least square regression analysis. The results obtained from the two methods were in good agreement with one another. The correlations obtained in this study were of moderate to very strong strength and fell in the range of the results of previous studies. Investigation of the results indicated significant influences of ground water on electrical resistivity and soil stiffness on shear wave velocity. Results of this study can be used for soil classification and determination of mechanical and seismic characteristics of soil across various areas.

scholarly journals Importance of coherence between geophysical and geotechnical data in dynamic response analysis

2019 ◽  
Vol 92 ◽  
pp. 18007
Author(s):  
Mourad Karray ◽  
Simon-Pierre Tremblay ◽  
Mahmoud N. Hussein ◽  
Mohamed Chekired
Keyword(s):  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Geophysical Methods ◽  
Field Measurements ◽  
Alternative Methods ◽  
Response Analysis ◽  
Eastern Canada ◽  
Geotechnical Tests

The demand for a precise evaluation of shear wave velocity Vs, is gaining interest in the field of geotechnical engineering due to its importance as a key parameter required to properly evaluate typical characteristics of soils. Nowadays, Vs measurements are performed on the field using different methods, such as SCPT tests and various geophysical methods. However, the effectiveness of these field measurements is not guaranteed and rather depends on how they are analyzed. Furthermore, a proper analysis is critical since the collected data may be used in liquefaction evaluation or earthquake ground response analyses. In these situations, it is recommended to verify the coherence between the obtained geophysical (Vs) and geotechnical (N-SPT, qc-CPT) measurements using alternative methods (e.g., Vs-correlations, H/V method, etc...). In some situations, the correlation between the different measurements makes it easier to unambiguously define seismic wave profiles. In other cases, geophysical and geotechnical tests would provide different resolutions for Vs measurements, an issue that complicates the decision of the practitioner. In this paper, we first demonstrate the importance of the shear-wave velocity in liquefaction potential analysis. A case study performed in eastern Canada is also presented where we show the importance of the method used to calculate Vs profiles (MASW, MMASW).

scholarly journals Multidisciplinary site investigations: refraction microtremor surveys

2021 ◽  
Author(s):  
A. Pancha ◽  
R. A. Apperley
Keyword(s):  
Case Studies ◽  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Velocity Versus ◽  
Stream Channels ◽  
Depth Profiles ◽  
Site Investigations ◽  
Geotechnical Investigations ◽  
Refraction Microtremor

AbstractWe present three case studies from recent site investigations that have utilised geophysical data to supplement traditional geotechnical investigations. The refraction microtremor (ReMi) method, which measures the shear-wave velocity of the subsurface soil profile, is used to enhance our overall understanding of geotechnical site conditions. Interpolation of the closely spaced one-dimensional velocity-depth profiles along linear arrays allows two- or three-dimensional velocity-versus-depth representations to be produced, thereby mapping lateral variations and extending subsurface characterisations between more expensive spot borehole measurements. The ReMi technique provides a non-invasive and cost-effective way of estimating vertical soil/rock shear-wave versus depth profiles and therefore is an effective reconnaissance tool for targeting key areas for further, more expensive intrusive investigation method. This paper examines the contribution ReMi shear-wave velocity assessments can make towards enhancing subsurface geological and geotechnical models to mitigate risk from unforeseen ground conditions. Case studies demonstrate the benefits of incorporating the shear-wave velocity estimates from ReMi into the geotechnical investigations. These include identifying the thickness of basalt flows, identifying the location of buried stream channels, characterising palaeo-topographical features, identifying areas of low velocity which may be prone to liquefaction, and assessing the thickness and velocity variations within geological units between borehole and test pit locations. The objective is not to replace traditional geotechnical investigations but allow more meaningful ground models to be developed.

scholarly journals Penetration vs. Shear Wave Velocity for Evaluation of Liquefaction Potential in Northeast Arkansas

2010 ◽  
Vol 4 (1) ◽  
pp. 16-37
Author(s):  
Ashraf Elsayed ◽  
Shahram Pezeshk
Keyword(s):  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Standard Penetration Test ◽  
Invasive Technique ◽  
Liquefaction Resistance ◽  
Liquefaction Potential ◽  
State Highway ◽  
Geotechnical Investigations ◽  
Simplified Procedure

Shear wave velocity profiles at 16 bridge sites in Northeast Arkansas (NEA) were determined using a hybrid, non-invasive technique. These profiles were used to evaluate the liquefaction resistance at the selected sites using the simplified procedure by Seed and Idriss (Vs approach). The liquefaction resistance was also evaluated using the Standard Penetration Test (SPT approach) results from the geotechnical investigations at these sites that were conducted by the Arkansas State Highway and Transportation Department (AHTD). The Liquefaction Potential Index (LPI), as introduced by Iwasaki, was used to evaluate the severity of liquefaction. The results of both approaches were then compared. Recommendations were made to AHTD personnel for liquefaction evaluation of future bridge projects based on the results of this research.

scholarly journals The use of resistivity and seismic cone penetration tests for site characterization

2008 ◽  
Vol 40 (1) ◽  
pp. 87-96 ◽  
Author(s):  
Mariusz Lech ◽  
Marek Bajda ◽  
Katarzyna Markowska-Lech
Keyword(s):  
Electrical Resistivity ◽  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Site Characterization ◽  
Cone Penetration ◽  
Cone Penetration Tests ◽  
Clay Deposits ◽  
Penetration Tests

The use of resistivity and seismic cone penetration tests for site characterization The use of resistivity and seismic cone penetration tests for site characterization. Recent application of cone penetration tests to geotechnical and environmental site characterization has generated a wide collection of new sensors. This paper presents methods of interpreting geotechnical in situ investigations carried out by electrical resistivity (RCPT) and seismic (SCPT) cones. It contains some fundamental equations and the description of in situ electrical resistivity and shear wave velocity measurements and presents the results of SCPT and RCPT investigations at the experimental Stegny site in Warsaw. The aim of the paper is to present the approach to determination of shear wave velocity and porosity of clayey soils. According to the test results obtained, it can be concluded that both applied techniques are very useful to estimate the distribution of clay deposits and some of their geotechnical parameters.

scholarly journals A Comparison of Four Geophysical Methods for Determining the Shear Wave Velocity of Soils

2007 ◽  
Vol 13 (1) ◽  
pp. 11-23 ◽  
Author(s):  
N. Anderson ◽  
T. Thitimakorn ◽  
A. Ismail ◽  
D. Hoffman
Keyword(s):  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Geophysical Methods
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