山区陡坡桩柱的承载特性研究进展

Research progress of Bearing Characteristics of Pile Column at Steep Slope in Mountain Areas

针对中国西部山区复杂工程地质条件下施工与运营过程中,陡坡桥梁桩柱承受复杂荷载作用的受力特点,首先阐述了陡坡地段常用嵌岩桩的抗滑性能及影响桩侧摩阻力与桩端阻力发挥的多种因素,着重从室内模型试验和现场试验研究及计算机数值模拟分析等方面讨论了其水平承载性状的理论计算方法与在复杂荷载条件下的应力分布与变形性状,并研究了嵌固深度的计算方法;其次对多数学者认可的陡坡双桩柱的门式框架计算模型进行了探讨,该模型争议较多问题是岩(土)体的压力分布问题;再者对长桩屈曲、桩柱高墩的稳定性与桩基陡坡的稳定性等已有的研究成果进行了分析;最后指出了山区陡坡地段桩柱需要进行深入研究的一些问题,为其工程设计与理论计算的研究及试验发展提供参考。

Aimed at complex loading characters of bridge pile columns at steep slope during construction and service under complex geological conditions in west mountain areas of China, first, the anti-skid performance of rock socketed piles at steep slope and the factors that affect pile skin friction and pile end resistance were elaborated, the theoretical methods to calculate the horizontal bearing characters and the sress distribution and deformation under complex loading were researched emphatically from lab model test and field test to compute simulation, and the method to calculate the socket depth was studied. Then, the theoretical model of portal frame for double-pile columns at steep slope suggested by most scholars, in which the question of controversial rock/soil pressure distrubution, was discussed. Third, the achievements of researching long pile buckling and the stablity of high-rise pile-column piers or pile steep slope were analyzed. At last, some questions of pile column at steep slope in mountain area that needs to be deeply studied to provide reference for devolopment of theoretical calculation and tests in engineering design.＂