ENGINEERING-GEOLOGICAL HAZARDS ASSESSMENT FOR SUSTAINABLE DEVELOPMENT OF NEW RASHID CITY, EGYPT (Resubmitte)

Ali, Abdullah Fares; Mohammed, Samir A. AlTawab; Ogila, Waleed A. Al Moghni; Draz, Osama Abd Alal; El Hadidy, Mahmoud Salah

doi:10.21608/egjg.2025.381083.1112

ENGINEERING-GEOLOGICAL HAZARDS ASSESSMENT FOR SUSTAINABLE DEVELOPMENT OF NEW RASHID CITY, EGYPT (Resubmitte)

Document Type : Original Article

Authors

¹ Geology dep., Faculty of Scie., Ain shams univ.

² Geol. Dep. Fac. of Scie. , Ainshams Un.

³ Geol. Dep., Fac. of Scie., Ain Shams Uni.

⁴ Subsurface Geology Departments, Nuclear Material Authority

⁵ Seismology Department, National Research Institute of Astronomy and Geophysics.

10.21608/egjg.2025.381083.1112

Abstract

New Rashid City is located the northwestern of Nile Delta, Egypt. As many coastal cities around the world, it has susceptible to liquefaction and radiation hazards. These hazards affect the environment, the humans, the economy, and sustainability. Eighty-one boreholes, two hundred and four samples, three hundred seismic refraction profiles, and radiometric measurements were carried out to evaluate and analyze these hazards and build a geo-hazard map for the study area. The obtained results, that should be the soil profile, are divided into two main types: loose to medium dense, poorly graded, fine- to medium-grained sand, followed by high plasticity silt with sand. The main geotechnical hazard in New Rashid is soil aggression from the intrusion of seawater; hence, should be the average GWL (Ground water level) is 0.6 m. The effective dose rate of New Rashid was between 29.8 μSv y-1 and 135.4 μSv y-1, with an average value 72.5 μSv y-1 (< 1 μSv y-1), so it is safe for radioactivity. Still, the potassium concentration only was average 430 Bq/kg, more than the International Atomic Energy Agency limit (370 Bq/kg). This is because of saturated soil by seawater, which increases potassium concentration between soil particles during wetting and drying cycles. Seismically, New Rashid has low dynamic and low damping properties and has a moderate liquefaction potential index (LPI) 5 > LPI > 15%. New Rashid does not have collapsibility or swelling potential hazards, with an average of the collapsibility index = 1.50 and an average of swelling pressure = 100 kPa. New Rashid achieves sustainability by mitigating liquefaction potential by the stone column technique and amendments of potassium radionuclides through stabilization by aluminum silicates as primarily clay minerals.

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