优化的变形协调条件在桩-锚结构锚索拉力计算中的应用

发布时间：2018-07-17 00:16

【摘要】：锚索抗滑桩的设计计算包括锚索拉力计算和桩体内力计算,而锚索拉力又直接影响桩体内力,因此,锚索拉力计算对桩-锚结构设计十分关键。在常规和修改变形协调条件的基础上,考虑锚索预应力作用在滑动面处桩身产生的位移和转角对第i排锚索作用点处桩身位移的贡献,除去其他排锚索预应力Rj0对桩身作用产生的位移,同时考虑锚索拉力增量的水平分量作用对桩体变形的影响,对滑动面处桩身位移、转角以及其他排锚索拉力对某一排锚索作用点处桩身位移的贡献进行优化,建立优化的桩-锚变形协调方程。结合结构力学中的虚功原理和图乘法理论,编写Visual C++计算程序,通过滑坡工程实例对锚索预应力和总拉力进行计算。3种变形协调条件的计算结果表明:优化的变形协调条件不仅能使抗滑桩在预应力施加阶段处于有利的受力和变形状态,而且适用于锚索与水平面成不同角度的情况,弥补了常规和修改变形协调条件的不足。
[Abstract]:The design calculation of anchor cable anti-slide pile includes the calculation of cable tension and the calculation of internal force of pile, and the tension of anchor cable directly affects the internal force of pile. Therefore, the calculation of anchor cable tension is very important to the design of pile-anchor structure. On the basis of conventional and modified deformation coordination conditions, considering the displacement of pile body caused by anchor cable prestress action on sliding surface and the contribution of rotation angle to pile body displacement at the point where the first row of anchor cable is used, The displacement of pile body caused by prestressed Rj0 is removed, and the effect of horizontal component of cable tension increment on the deformation of pile body is considered, and the displacement of pile body at sliding surface is considered. The contribution of the rotation angle and other cable tension to the displacement of the pile body at the point at which the cable is used is optimized, and the optimal equation of the pile-anchor deformation coordination is established. Based on the virtual work principle and graph multiplication theory in structural mechanics, a Visual C program is developed. The calculation results of 3 kinds of deformation coordination conditions for anchor cable prestress and total tensile force in landslide engineering show that the optimized deformation coordination condition can not only make the anti-slide pile in favorable stress and deformation state in the prestress application stage. Moreover, it is suitable for different angles of anchor cable and horizontal plane, which makes up for the deficiency of conventional deformation and modification of deformation coordination condition.
【作者单位】：中国地质大学(武汉)教育部长江三峡库区地质灾害研究中心;中国地质大学(武汉)工程学院;
【基金】：国家自然科学基金项目(No.41272306)
【分类号】：TU473.1

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