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针对山区高陡横坡地段桥梁双桩基础的结构与荷载特征,建立了桩基与边坡及桩间土相互作用新模式:后桩承受推力以滑动面为界简化为滑坡推力与主动土压力;前桩与后桩所承受的侧土抗力则服从(mz+C)的线性增长规律;并假定桩间土对前桩的作用力q-a是桩间距、桩宽(桩径)及滑坡体宽度的函数,由此可充分反映桩间土及滑坡体对土压力传递的影响。在此基础上,导得不同特征桩段的微分方程,并基于有限差分解进行了求解,从而提出了高陡横坡段桥梁双桩结构内力位移计算方法。理论计算与室内模型试验实测数据的对比表明,该方法误差可满足工程要求。
Aiming at the structure and load characteristics of bridge double-pile foundation in high and steep slope area in mountainous area, a new mode of soil-pile interaction between pile foundation and slope and between piles was established. The post-pile bearing thrust was simplified as landslide thrust and active earth pressure (Mz + C) linear growth law; and suppose the interaction between the pile of soil on the former pile q - a is the pile spacing, pile width (pile diameter) And the width of the landslide body, which can fully reflect the impact of soil and landslide between the soil pressure transmission. On this basis, the differential equations of different characteristic pile sections are derived and solved based on the finite difference solution. Therefore, the calculation method of the internal force displacement of the double-pile bridge with high and steep grade sections is proposed. The comparison between theoretical calculation and measured data of indoor model test shows that the error of this method can meet the engineering requirements.