Identification of Subsurface Structures and Dynamic Modulus Determination Based on Downhole Seismic Surveys (Case Study)

Chatrayi, Hosein; Hajizadeh, Farnusch; Taghavi, Behnam

doi:10.1007/s10706-021-01831-x

Cited by 5 publications

(3 citation statements)

References 4 publications

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“…By calculating the mean velocity from 22 seismographic boreholes, it was determined that the researched site belongs to European Standard class B. (Chatrayi et al, 2021) Table .1. Geological structures of the region, as seen in Fig.…”

Section: Datamentioning

confidence: 99%

“…The purpose of this study is to quantify the porosity of clay soil and evaluate whether these porosities are saturable with liquid. The relationships between the porosity and seismic P-and S-wave velocities of clay soils were therefore examined in this paper using data from technical reports, such as the geotechnical crosssections, made up of the data obtained from the seismic-refraction, boreholes, and observation holes (Chatrayi et al, 2021). Fine sand, sand, and gravel with silty-clay are the soil types that define the research regions.…”

Section: Introductionmentioning

confidence: 99%

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Clay soil porosity estimation using seismic P- and S-wave velocities along Isfahan Metro Line 2

Chatrayi,

Hajizadeh,

Taghavi

2024

Acta Geophys.

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To study how the soils, respond to an earthquake, seismic waves are frequently utilized.The purpose of this work is to build the porosity graphs based on the geotechnical parameters of the soils and forecast the porosity of shallow clay soils using seismic wave velocities that analyze the dynamic features of the soil. Compressional (P) and shear (S) wave velocities, seismic velocity ratio, Poisson ratio, bulk modulus, and shear modulus are the factors used to calculate porosity. In this work, porosity values are calculated using grain and dry densities of core samples taken from different boreholes within the study region, and bulk modulus, shear modulus, and Poisson ratio are calculated using P-and S-wave velocities obtained by utilizing the seismic-refraction method, as well as porosity values. The research region is in Iran; Isfahan Metro Line 2 and mostly consists of clay, silt, sand, and gravel deposits. Based on the values of the Poisson ratio, seismic P wave velocity, seismic velocity ratio (Vp/Vs), and the stiffness of the clay soils, the data of the clay soils in the region were individually sorted. These characteristics were used to create novel multi-parameter relationships between clay soil porosity, seismic velocities, shear modulus, and the Poisson ratio. Using the error norm approach, the errors in the parameters utilized for each relationship were identified. The error norm technique's findings show that the shear wave velocity and shear module have the lowest error when calculating porosity. Therefore, it is advised to estimate porosity of shallow clay soils using the given correlations. These relationships can be used to assess the porosity of clay soil and to determine if the soil's pores are saturated with liquid.

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Section: Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Clay soil porosity estimation using seismic P- and S-wave velocities along Isfahan Metro Line 2

Chatrayi,

Hajizadeh,

Taghavi

2024

Acta Geophys.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The purpose of this study is to quantify the porosity of clay soil and evaluate whether these porosities are saturable with liquid. The relationships between the porosity and seismic P-and S-wave velocities of clay soils were therefore examined in this paper using data from technical reports, such as the geotechnical crosssections, made up of the data obtained from the seismicrefraction, boreholes, and observation holes (Chatrayi et al, 2021). Fine sand, sand, and gravel with siltyclay are the soil types that de ne the research regions.…”

Section: Introductionmentioning

confidence: 99%

Clay Soil Porosity Estimation Using Seismic P and S-Wave Velocities

Chatrayi,

Hajizadeh,

Taghavi

2023

Preprint

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To study how the soils, respond to an earthquake, seismic waves are frequently utilized. The purpose of this work is to build the porosity graphs based on the geotechnical parameters of the soils and forecast the porosity of shallow clay soils using seismic wave velocities that analyze the dynamic features of the soil. Compressional (P) and shear (S) wave velocities, seismic velocity ratio, Poisson ratio, bulk modulus, and shear modulus are the factors used to calculate porosity. In this work, porosity values are calculated using grain and dry densities of core samples taken from different boreholes within the study region, and bulk modulus, shear modulus, and Poisson ratio are calculated using P- and S-wave velocities obtained by utilizing the seismic-refraction method, as well as porosity values. The research region is in Iran; Isfahan Metro Line 2 and mostly consists of clay, silt, sand, and gravel deposits. Based on the values of the Poisson ratio, seismic P wave velocity, seismic velocity ratio (Vp/Vs), and the stiffness of the clay soils, the data of the clay soils in the region were individually sorted. These characteristics were used to create novel multi-parameter relationships between clay soil porosity, seismic velocities, shear modulus, and the Poisson ratio. Using the error norm approach, the errors in the parameters utilized for each relationship were identified. The error norm technique's findings show that the shear wave velocity and shear module have the lowest error when calculating porosity. Therefore, it is advised to estimate porosity of shallow clay soils using the given correlations. These relationships can be used to assess the porosity of clay soil and to determine if the soil's pores are saturated with liquid.

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Shear wave velocity (Vs) and SPT resistance (N) correlation for the Isfahan Metro, Iran

Chatrayi,

Hajizadeh,

Taghavi

2023

Acta Geophys.

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The evaluation of earthquake damage is a crucial problem for ground improvement, and it is dependent on the ground motion. The shear wave velocity determines the features of an earthquake motion at a location (V s ). Although the shear wave velocity pro le at a location might not be easily accessible, the number of blows (N) from a standard penetration test (SPT) is. The establishment of a trustworthy connection between Vs, as determined by multichannel analysis of surface wave testing, and N, as determined by SPT at Isfahan Metro Line 2, is presented in this study. These tests have been run on a total of 22 boring logs (within a radius of 30 km). The index qualities of the SPT samples are examined in a lab setting. The study is crucial for this area since the resistance of the subway structure must be examined. An empirical correlation between V s and N was created based on the statistical analyses. All soil types, sands only, and clay alone are treated individually in this manner. The established ties are comparable to those established for other sites around the world. Also, a comparison with relevant relations is provided. Given that ground motion is one of the key characteristics in seismic microzonation of the area, the proposed relations will be useful. Test No. Borehole No. Depth (m) USCS Remark BH-S07 0-2.20 Man Made Fill N (4-14) V s (277-671

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Identification of Subsurface Structures and Dynamic Modulus Determination Based on Downhole Seismic Surveys (Case Study)

Cited by 5 publications

References 4 publications

Clay soil porosity estimation using seismic P- and S-wave velocities along Isfahan Metro Line 2

Clay soil porosity estimation using seismic P- and S-wave velocities along Isfahan Metro Line 2

Clay Soil Porosity Estimation Using Seismic P and S-Wave Velocities

Shear wave velocity (Vs) and SPT resistance (N) correlation for the Isfahan Metro, Iran

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