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为研究特大型岩溶地区回填体特性对桩基础荷载传递的影响,提高岩溶桩基的安全性与经济性,本文考虑特大型岩溶地区桩周回填体与基桩协调变形产生侧摩阻力的特性,基于指数荷载传递函数,获得了特大型岩溶地区回填体基桩荷载–沉降曲线计算方法,并结合现有研究成果与工程实例对该计算方法进行验证,结果表明本文方法与实际工程的结果很吻合,在此方法的基础上,分析各参数对岩溶桩基荷载–沉降曲线的影响,分析结果表明:桩基的荷载–沉降曲线随着轴向应变、碎石粒径与桩参数?s的变化而变化,桩基的极限承载力随着轴向应变与桩参数?s的增加而增加,随着碎石粒径的增加反而减小。
In order to study the effect of backfill characteristics on pile foundation load transfer in extra-large karst area and improve the safety and economy of karst pile foundation, this paper considers the characteristics of lateral friction caused by coordinated deformation of pile-backfill and foundation pile in extra-large karst region, Based on exponential load transfer function, the calculation method of load-settlement curve of backfill piles in extra-large karst area is obtained, and the calculation results are verified by the existing research results and engineering examples. The results show that the proposed method is in good agreement with the actual engineering results On the basis of this method, the influence of various parameters on the load-settlement curve of karst pile foundation is analyzed. The results show that the load-settlement curve of pile foundation varies with the axial strain, the particle size of granite and the change of pile parameter However, the ultimate bearing capacity of pile foundations increases with the increase of axial strain and pile parameters, but decreases with the increase of gravel diameter.