Geotechnical Assessment of Dar Al Salam Complex in Hilla City, Babylon Using the Seismic Refraction

  • Ali F. Mohsain Department of Applied Geology, College of Science, University of Babylon, Babil, Iraq
  • Amer A.L. Al-Khalidy Department of Applied Geology, College of Science, University of Babylon, Babil, Iraq
Keywords: Dar Al Salam Complex, Waves, Geotechnical assessment, Reflex 2D

Abstract

In this study, the horizontal seismic refraction survey method was used to calculate the elasticity coefficients of the soil of the Dar Al-Salaam complex site in the city of Hilla, Babil Governorate. A seismic survey was conducted along four lines to find the shear and longitudinal velocities. Two lines of length (115) meters in the direction north-south and others in the direction east-west, with a front, medium and reverse shock in each direction. The data were processed and interpreted by using the Reflex 2D Quick software. The results for the first layer were for the longitudinal velocity (Vp) (189-259 m/sec and for the second layer (342-411) m/sec and the thickness of the layer was (3.7) m. While the shear velocity of the first layer (VS) was (119-109) and the second layer (197-233.5) m/sec. The dynamic elasticity coefficients were calculated from these velocities, such as Poisson's ratio(δ) and Young’s modulus (E ), Bulk modulus (K), shear modulus (μ), The amount of the Poisson's ratio for the first layer ranged between (0.32-0.44) and its average in the first layer is 0.37 while the Poisson's ratio in the second layer ranged between (0.35-0.276) and its average in the second layer is 0.305, while the highest value of the Shear Modulus(u) was recorded in the second layer at 103.7 MPa and the average of Young’s Modulus of the first layer was recorded at 25.5 MPa, which indicated the second layer was characterized by its high hardness, strength, while the highest value of the Bulk modulus (K) was recorded in the second layer at 288.7 MPa and the average of Bulk modulus (K) of the first layer was recorded at 74.8 MPa ,while the highest value of the Young’s Modulus was recorded in the second layer at 209 MPa and the average of Young’s Modulus of the first layer was recorded at 57 MPa, which showed the improvement of engineering soil properties in the second layer in all stations of the study area.

Published
2022-06-23