双排板桩间土压力计算方法及其应用

Calculation method of earth pressure between double-row piles and its application

现有双排板桩间土压力的计算大都直接采用经典土压力公式,没有综合考虑桩间土与板桩之间摩擦力的影响.针对以上问题,根据极限平衡理论,考虑桩间土与板桩之间摩擦力、桩间宽度的影响,得出了双排板桩间土压力的计算方法.对其进行拓展,使之能应用于黏性土、非黏性土、不可压缩基础、可压缩基础上.随着板桩间宽度的增加,该方法计算出的土压力呈曲线分布,渐近线接近于垂直线,土压力值的大小接近于朗金公式.经与有限元软件Plaxis的结果对比,土压力计算结果趋向性相同,土压力计算值基本一致,证明该计算方法基本合理可靠、结果可信.

Most of the existing calculation methods about the earth pressure between double-row piles are depending on classical earth pressure formula,without considering the influence of friction between pile and soil.In view of the above problems,according to the ultimate balance theory,the calculation method is presented with considering the influence of friction between the soil and the pile and the width between piles to calculate earth pressure between doublerow piles, and it is expanded to make it applicable to the cohesive soil, the non cohesive soil, the incompressible foundation and the compressible foundation.With the increase of width between piles,the earth pressure calculated by this method presents a curve distribution,the asymptote is close to the vertical line,and the value of earth pressure is close to the Rankine formula.Compared with the results of the finite element software Plaxis,the calculated results of the earth pressure have the same tendency,and the calculated values of the earth pressure are basically the same,which proves that the calculation method is basically reasonable and reliable,and the results are reliable.