基于滑移线理论被动桩土压力的改进计算方法  

Improved Computational Method Based Upon Slip-line Field Theory For Passive Plies For Practical Use

作　　者：韩同春[1,2] 刘振 邱子义 

机构地区：[1]浙江大学滨海和城市岩土工程研究中心,杭州310058 [2]浙江大学软弱土与环境土工教育部重点实验室,杭州310058 [3]Department of Civil and Environmental Engineering,Michigan Technological University

出　　处：《科技通报》2016年第5期137-141,146,共6页Bulletin of Science and Technology

基　　金：国家自然科学基金资助项目(51178423);浙江省自然科学基金资助项目(LY15E080010)

摘　　要：针对Ito T.塑性变形理论,在原方法模型和假设的基础上,对桩间部分土体引入塑性滑移线理论。根据塑性区的受力平衡,得出被动桩在桩间距较小时桩间土的极限土压力。基于所增加的塑性假设推导出改进公式适用的桩间距并由大量计算给出适用土性范围。所得方法在极大简化推导过程的前提下,在原方法适用范围内与其计算结果极为接近。同时省去积分过程,并改善由此产生的公式随摩擦角等参数变化在一定桩间距条件下严重偏离实际的性状。推导出的桩间距上下限值等则能为公式实际应用提供更为有效的支持。Imported slip-line field theory into some given parts of plastic area in Ito’s Theory of PlasticDeformation. Developed a new computational method by extending and modifying assumptions andreasoning. Obtained improved equations to calculate ultimate load for surrounding soil withcomparatively small pile space, considering the equilibriums of the plastic regions. Additionallydiscussed the pile spacing, taking into account the assumptions for educing. Then proved its results to bein considerably agreement with the original one within its scope of its applicability. Educed methodwithout integral process proved to effectively improve the behavior of original equations with frictionangle due to some given conditions for pile space. Proposed lower and upper limits to lend support topractical use.

关 键 词：被动桩 极限土压力 滑移线 桩间距 

分 类 号：TU473[建筑科学—结构工程]