Inner-force calculation of bridge pile foundation in a high-steep slope based on the pasternak double-parameter spring model
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摘要: 为考虑土体剪切模量对陡坡段桥梁基桩内力计算的影响，首先探讨桩后土压力的分布形式，并根据陡坡段桥梁基桩的承载特性建立简化分析模型；其次，引入Pasternak双参数模型，建立可考虑土体剪切模量的地基抗力计算模型；并在此基础上分别对受荷段与嵌固段基桩微元进行受力分析，求得各段控制差分方程，从而进一步迭代求解桩身位移及内力；最后，分别用陡坡段桥梁基桩实测数据与Pasternak双参数模型算例对本文内力计算方法进行验算，结果表明：本文计算方法用于陡坡段桥梁基桩内力计算是合理的，可为同类工程提供参考。Abstract: In order to examine the influence of shear modulus on bridge pile foundation in a high-steep slope, the distribution of soil pressure is discussed, and a new simplified calculation model is presented according to the bearing characteristics of bridge pile foundation in the high-steep slope. Based on the Pasternak double-parameter spring model for foundations, a new ground resistance model is used to describe the shear action. The stress of pile elements of the loaded period and the fixed period is analyzed, and the governing differential equations are established. The finite-difference solution of displacement and force of pile foundation are obtained by solving these equations. The inner-force calculation is separately compared with the testing data of bridge pile foundation in the high-steep slope and an example of the Pasternak double-parameter spring model for foundations is presented. The results indicate that the theoretical calculation results are in good agreement with the experimental data, illustrating that this calculation approach is of great significance for the preliminary design of bridge pile foundation in high-steep slopes.
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