双排抗滑桩计算方法研究

发布时间：2018-01-19 18:57

本文关键词： 双排桩滑坡推力分配弹性理论协调变形　出处：《西南交通大学》2007年硕士论文　论文类型：学位论文

【摘要】： 双排抗滑桩在实际工程中有广泛的应用，但对桩土相互作用机理尚不十分清楚，不同单位采用的计算模型和方法差别较大，给其合理的设计带来较大的困难。滑坡推力在双排桩之间的传递分配是该问题的关键，本文的目的就是建立双排抗滑桩计算模型，，对桩土相互作用机理进行研究，为设计计算提供依据。论文总结分析了双排抗滑桩的发展历史和研究现状。为研究双排抗滑桩的桩土相互作用机理，探索滑坡推力在前排桩、后排桩的传递分配关系，首先应用弹性力学或结构力学方法得出了桩间土及前排桩、后排桩水平位移的计算公式，然后建立桩、土之间的变形协调方程，求解后得到前、后桩与桩间土之间的作用力。研究结果表明，双排抗滑桩未带连梁时，滑坡推力在前、后排桩之间的传递分配主要是通过桩土的相互挤压作用宋完成的，体现在前后排桩的水平位移(挠度)的比较；当增大后排桩的刚度或减小前排桩的刚度时，桩土相互挤压作用越小，A_2/A_1随之减小，反之则A_2/A_1增大；前后排桩的排距b′对滑坡推力在双排抗滑桩之间的分配产生重要作用，当增大排距b′时，A_2/A_1随之增大；当减小排距b′时，A_2/A_1随之减小；随着后排桩与前排桩的刚度比增大，A_1、A_2逐渐减小，A_2/A_1也逐渐减小，但当刚度比达到一定值以后，A_1、A_2的变化幅度不大，A_2/A_1变化幅度也不大；双排抗滑桩带连梁时，滑坡推力在前、后排桩之间的传递分配，一方面是通过桩土的相互挤压作用来完成的，同时也通过连梁传递分配；连梁传递了一定的滑坡推力，但当与桩的刚度比增大到一定值以后，A_1、A_2的变化幅度不大，A_2/A_1变化幅度也不大。作为一个应用实例，作者对三峡库区万泉滑坡西区B滑坡的抗滑桩进行了计算设计，结果表明，当滑坡推力较大时，双排抗滑桩较单排抗滑桩更为经济合理。
[Abstract]:Double-row anti-slide piles are widely used in practical engineering, but the mechanism of pile-soil interaction is not very clear, and the calculation models and methods used by different units are quite different. The distribution of landslide thrust between double-row piles is the key to this problem. The purpose of this paper is to establish a calculation model of double-row anti-slide piles. The mechanism of pile-soil interaction is studied, which provides the basis for design and calculation. In order to study the pile-soil interaction mechanism of double-row anti-slide piles, the transfer and distribution of landslide thrust in the front row pile and back row pile are explored. First, the formula of horizontal displacement of soil and pile in front row and back row is obtained by means of elastic mechanics or structural mechanics, then the equation of deformation coordination between pile and soil is established, and the solution is obtained. The research results show that the landslide thrust is in front of double-row anti-slide pile without connecting beam, and the transfer and distribution between back row pile and pile are mainly accomplished by the interaction of pile and soil. It is reflected in the comparison of horizontal displacement (deflection) of front and rear piles. When the stiffness of the back row pile is increased or the stiffness of the front row pile is reduced, the smaller the pile-soil squeezing action is, the smaller the Astack / A-1 ratio decreases, whereas the latter increases the A2 / A-1. The row distance b'of the front and rear row piles plays an important role in the distribution of landslide thrust between the two row anti-slide piles, and when the row distance b'is increased, the A / A / A 1 increases with the increase of the row distance. When the row distance B'is reduced, the number of As / A1 decreases. With the increase of the stiffness ratio of the rear pile to the front row pile, the ratio of A / A / A / A / T / 2 decreases gradually, but when the stiffness ratio reaches a certain value, the change of A1A / A2 is not large. There was also little change in A2 / A1s; In the case of double-row anti-slide pile with connecting beam, the transfer distribution of landslide thrust in front and back row pile is accomplished by the interaction of pile and soil on the one hand, and also by connecting beam on the other hand. Even the beam conveys a certain landslide thrust, but when the stiffness ratio of the pile increases to a certain value, the variation of A1 / A1 / A1 is not large, and so is the change of A2 / A1. As an application example. The authors have calculated and designed the anti-slide pile of B landslide in the west part of Wanquan landslide in the three Gorges Reservoir area. The results show that the double-row anti-slide pile is more economical and reasonable than the single-row anti-slide pile when the thrust of the landslide is large.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2007
【分类号】：TU473.12

【引证文献】