深基坑支护桩与土相互作用的研究  

Research on interaction between deep excavation supporting pile and soil

作　　者：朱彦鹏[1] 魏升华[1] 

机构地区：[1]兰州理工大学土木工程学院,兰州730050

出　　处：《岩土力学》2010年第9期2840-2844,共5页Rock and Soil Mechanics

基　　金：国家自然基金项目资助(No.50978129);甘肃省自然基金资助(No.ZS032-B25-021);甘肃省科技攻关项目(No.2GS064-A52-040)

摘　　要：为使多层地基土中深基坑支护设计考虑支护结构-土的非线性共同作用,提出由集中力弹簧模型建立支护桩与土相互作用的p-y曲线,进而根据一般弹性地基梁的挠曲微分方程,并考虑桩与锚杆的变形协调,推导出考虑非线性共同作用的预应力锚杆支护桩的挠曲微分方程,应用有限差分法计算预应力锚杆支护桩的位移和内力。实例计算表明,计算结果能更好地满足工程实际的要求。Considering the nonlinear interaction between soil and supporting-structure in soil layers for deep excavation designs,p-y curves of supporting pile and soil was proposed according to concentrated force spring model.Based on piles shaft deflection differential equation of the general elastic foundation beam and considering that the deformation of anchor is compatible with the anti-slide pile＇s deformation,a differential equation of the piles with prestressed anchor cables considering the nonlinear interaction is derived.Adopting finite difference method to calculate internal force and deflection of supporting piles.Finally,in comparison with the other methods,the calculated results of engineering example indicate that this paper is satisfied for engineering calculation.

关 键 词：深基坑 预应力锚杆排桩 非线性共同作用 变形协调 有限差分法 

分 类 号：TU471[建筑科学—结构工程]