牌坊坝滑坡双排桩+锚索支护性能研究

Study on Supporting Properties of Double-row Piles with Anchor in Slide of Paifang Dam

相对于单排桩而言,双排桩侧向变形刚度大,抗变形能力强、承载力更高,当采用单排桩难以满足抗滑力要求时,常采用双排桩形式。然而,双排桩受力复杂,特别是有预应力锚索共同支护这种特别复杂情况下,结构体各部分内力分布、相互作用关系及相关的设计和计算方法都还不成熟。本文在总结前人成果的基础上,将有限元强度折减法引入到双排桩+锚索的计算中,并在牌坊坝滑坡工程中得到了运用。研究表明,双排桩+锚索是一种有效的支护形式,它不仅能极大的提高边坡抗震性能及变形能力,还能显著的提高边坡的动静力安全性,值得在工程中推广。

Compared with the single row of piles,the large lateral stiffness of double-row pile offers strong resistance to deformation and high bearing capacity,when the single row pile is difficult to meet the requirement of antisliding force,the double-row piles form is used. However the double-row piles have complex stress,especially under the complex situation of joint supporting with prestressed anchor,the internal force distribution of each part of the structure,interaction relationship and relevant design are not clear and calculation method are not mature. In this paper,based on the achievements of the predecessors,the strength reduction finite element method was introduced to calculate the double-row piles and anchor cable,and has been used in arch dam engineering of landslide. Research shows that double-row piles and prestressed anchor cable is a kind of effective support form,it can not only improve the performance of slope seismic and deformation capacity greatly,but also increase the dynamic and static security of the slope significantly,so it is worthy to be popularized in engineering.