مقاله انگلیسی رایگان در مورد ظرفیت باربری فونداسیون کامپوزیتی با شمع مرکب – اسپرینگر 2017

It has been over 200 years since European engineers first applied gravel piles to consolidate sedimentary soft soil in the early nineteenth century (Hughes and Withers 1974). The technology has been widely used and rapidly developed in the consolidation treatment of soft soil foundation. The lateral constraining force generated by gravel piles constrained by the confining forces of surrounding soil can to a certain extent improve the bearing capacity of the composite foundation of gravel piles. However, bulging damage, overall shear or sliding failure, and punching failure frequently occur on gravel pile composite foundations (Zhao et al. 2011). In addition, the lateral constraint is low due to the swallow burial depth so that bulging deformation failure happens within the pile top in the depth one to three times of the pile diameter (Murugesan and Rajagopal 2009). To solve this problem, numerous scholars have carried out lots of researches on consolidation technologies of new gravel pile composite foundations. For example, composite foundations of discrete gravel materials with horizontal multilayer reinforcement, that is, foundations with multilayer geotechnical grilles well restrict the lateral deformation (Alamgir et al. 1996; Poorooshasb et al. 1996; Hasan et al. 2012). Piles are wrapped by using sleeves made from synthetic materials and hoop stirrups are set to restrict bulging deformation (Zhou and Zhang 1997; Zhuang et al. 2016). In addition, composite foundations of discrete gravel materials with geotechnical grilles set on the top of foundations for reinforcement show better bearing capacities than those of ordinary gravel pile composite foundations (Wang and Pi 2011; Deb and Mohapatra 2013). Aiming at the characteristic that bulging deformation is likely to occur on the top of gravel piles, the study puts forward a consolidation technology for the new composite foundation to further enrich the theory and engineering practice of gravel pile composite foundations. The new composite foundation is constructed by pouring concrete into the upper part of the gravel pile to make the concrete grout permeate to the bottom of the gravel piles, thus forming a concretegravel pile composite foundation. The proposal of the new composite foundation supplements the theoretical research system of composite foundations and provides important theoretical reference and engineering guiding significance.