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Case histories of ground improvement solutions using jet-grouting ABSTRACT The aim of this paper is to present the main design and construction criteria considered on some vertical jet-grouting solutions adopted by Tecnasol FGE. On these solutions ground improvement by vertical columns was successfully used as an alternative to traditional solutions, such as concrete cast in-situ pile foundations, earth retaining sheet pile walls and micro-piles for underpinning. On each case history, the following topics are presented: main scenario, geotechnical conditions, initial solution, main design criteria and construction issues. منبع @civilbest Improvemen Jet grout.pdf

Design control and monitoring of a jet grouted excavation bottom plug طراحی و کنترل های عملیات جت گروتینگ در ایستگاه های زیرزمینی N. Eramo & G. Modoni University of Cassino, Cassino, Italy M. Arroyo Alvarez de Toledo Universidad Politécnica de Catalunya, Barcelona, Spain ABSTRACT: Jet grouting is adopted in different geotechnical conditions to ensure provisional earth retaining and waterproofing functions in excavations. Despite careful theoretical models available to predict the mechanical response of these structures, design is often carried out without adequate control, i.e. by assuming ideal effectiveness of ground improvement. On the contrary, adverse effects have been documented by past experiences which can be traced back to erroneous prediction of treatments effects, inaccurate control of the execution or to unexpected responses of the surrounding environment. All these uncertainties, which are critical when working in urban areas, can be minimized by detailed preliminary field trials, accurate treatment execution control and a prompt monitoring of the surrounding area. The present paper illustrates these issues with a description of the design and execution of a massive jet grouting bottom plug forming the base of a large excavation for a tube station. The results of preliminary field trials are summarized to directly compare the effectiveness of different injection systems and introduced in statistical design analyses of the jet grouted structure. A detailed investigation of the surface movements induced by injections is also reported. To this aim, the evolution of displacements recorded around trial columns and on the area surrounding the excavation is mapped to evaluate the effects of the different adopted injection techniques. منبع Design_control_and_monitoring_of.pdf

مقاوم سازی خاک با روش جت گروتینگ فیلم به مدت تقریبی 3 دقیقه به نقل از کانال تلگرام civilca دانلود از پیوست video_2017-08-05_12-09-48.rar