Evaluation and Mitigation of Ground Loss and Shear Failure in Silty Sand Due to Static Liquefaction Potential with Geotextile Filtration

Abstract

Ground settlement poses significant challenges in civil engineering, affecting the stability of infrastructure. This study aims to investigate the causes of post-construction settlement and propose effective management strategies. The study area underwent a comprehensive visual inspection, including soil sampling for soil properties analysis and examination of groundwater levels. Physical modeling and finite element analysis were employed to analyze the causes of settlement. The physical model studies found that high groundwater levels led to the washing away of particles under the concrete slab, creating soil voids that contribute to settlements. Increasing the use of geotextiles and installing underground pipes to divert water away from vulnerable areas would help reduce settlement. Additionally, finite element analysis revealed that the presence of a concrete-paved ditch led to water accumulation at the base of slopes, resulting in soil liquefaction. Pore-water pressure ratios increase with rising underground water levels, leading to a decrease in the factor of safety and an increased risk of structural failure. To address these challenges, effective management and remediation recommendations were proposed, integrating sub-drainage systems with geotextile filtration. The sub-drain system diverts groundwater flow away from critical areas, mitigating the risk of further ground settlement. Geotextiles play a crucial role in filtering soil particles, preventing their accumulation, and potential damage to the drainage system. The proposed recommendations offer practical solutions for managing and mitigating settlement-related risks in civil engineering projects. Engineers can improve the stability and longevity of infrastructure by implementing these measures, minimizing the potential for costly repairs and disruptions.