PERFORMANCE OF SOIL-NAILED AND ANCHORED WALLS BASED ON FIELD-MONITORING DATA IN DIFFERENT SOIL CONDITIONS ISTANBUL

Abstract

In this study, data on the lateral wall displacements of 28 deep excavations in Istanbul soil from over 90 field monitors were collected and analysed. The most commonly used retaining walls for deep excavations in Istanbul are soil-nailed shotcrete walls (SNPWs) and contiguous pile walls (CPWs). Other types of retaining walls include anchored micropile walls (MPWs), diaphragm walls (DWs), concrete walls (CWs) and secantpile walls (SPWs). The analyses were performed under two main headings: analysis of soil-nailed walls' data and analysis of anchored walls' data. The data of delta(h,max) generally range from 0.05%H to 0.35%H with an average value of 0.20%H in the soil-nailed projects. The data of delta(h,max) generally range from 0.043%H to 0.32%H with an average value of 0.155%H in anchored pile wall projects. Some factors affecting the deformation of deep excavations, such as nail density, embedded wall ratio and wall stiffness, were studied based on field-monitoring data. Wall movements were also compared with observations in some case histories from around the world.