山区建筑桩基与边坡相互作用研究

发布时间：2018-06-05 05:24

本文选题：边坡 + 桩基　；参考：《重庆大学》2016年硕士论文

【摘要】：在重庆等山地城市,常需要在靠近边坡顶的位置修建建筑,建筑桩基和边坡的相互作用不容忽视。本文运用有限元软件ansys对边坡-桩基-框架整体模型进行静力和动力分析。本文的主要研究内容有:研究静力和动力作用下土质边坡和岩质边坡内的建筑桩基对边坡支挡结构设计侧向岩土压力的影响,和边坡变形对桩基内力的影响以及桩土隔开措施在静力和动力作用下的效果。通过本文的研究得出以下结论:(1)静力作用下,土质边坡和岩质边坡处于非极限状态时,建筑桩基的存在造成边坡的侧向岩土压力出现增大的现象。(2)静力作用下当边坡处于极限状态时,如果桩基的底部在挡土墙底部以下,桩基把建筑荷载传到了下面稳定的土层,可以不考虑建筑桩基对挡土墙的影响。在边坡滑动面以内的桩基受到边坡推力的作用,内力分布情况和抗滑桩相似。(3)静力作用下,有外倾结构面的岩质边坡处于极限状态时,建筑桩基起到了抗滑桩的有利作用,设计支挡结构时,可以不考虑建筑桩基的影响。但是桩的内力在穿越滑动面处发生突变,弯矩和剪力都很大,需要加强桩基的配筋。无外倾结构面的岩质边坡锚杆支挡设计时需要考虑建筑桩基的影响,支挡结构如果选择挡土墙,设计时不需要考虑建筑桩基的影响。(4)动力作用下土质边坡内有建筑桩基时,建筑桩基会传附加动土压力到挡土墙。附加动土压力呈倒三角形。动力作用下有外倾结构面岩质边坡内的建筑桩基起到了抗滑桩的有利作用,所以边坡锚杆的内力比无结构模型小。无外倾结构面的岩质边坡由于比较稳定,边坡变形小,建筑桩基和边坡的相互作用不明显。(5)由于桩基起到抗滑桩的有利作用,而且桩基通过竖向摩擦力传到滑体上的力并不大,所以油毡隔开的效果并不理想,套筒隔开措施有减小桩基内力的作用。
[Abstract]:In mountainous cities such as Chongqing, it is often necessary to build buildings near the top of the slope, and the interaction between the pile foundation and the slope can not be ignored. In this paper, the static and dynamic analysis of the slope-pile foundation-frame model is carried out by using the finite element software ansys. The main contents of this paper are as follows: the influence of the pile foundation in the soil slope and the rock slope on the lateral geotechnical pressure in the design of the slope retaining structure under the static and dynamic action is studied. And the influence of slope deformation on the internal force of pile foundation and the effect of pile-soil separation measures under static and dynamic action. Through the research in this paper, the following conclusion is drawn: under the static force, the soil slope and the rock slope are in the non-limit state. When the slope is in the limit state, if the bottom of the pile foundation is below the bottom of the retaining wall, the pile foundation transmits the building load to the underlying stable soil layer. The influence of pile foundation on retaining wall can be ignored. Under the action of slope thrust, the distribution of internal force is similar to that of anti-slide pile, when the rock slope with extroverted structure surface is in the limit state, the building pile foundation plays the beneficial role of anti-slide pile. When designing retaining structure, the influence of building pile foundation can be ignored. However, the internal force of the pile changes suddenly through the sliding surface, and the bending moment and shear force are very large, so it is necessary to strengthen the reinforcement of the pile foundation. The influence of building pile foundation should be taken into account in the design of anchor rod support of rock slope without extroverted structural plane. If retaining wall is selected, the influence of pile foundation should not be taken into account in the design of retaining structure, when there is building pile foundation in soil slope under dynamic action, Building piles transmit additional dynamic earth pressure to the retaining wall. The additional dynamic earth pressure is inverted triangle. Under the dynamic action, the pile foundation in the rock slope with extroverted structure has the advantage of anti-slide pile, so the internal force of the anchor rod of the slope is smaller than that of the unstructured model. Because the rock slope with no extroverted structure plane is relatively stable, the slope deformation is small, the interaction between the building pile foundation and the slope is not obvious. (5) because the pile foundation plays the beneficial role of anti-slide pile, and the pile foundation does not reach the sliding body through the vertical friction force, Therefore, the effect of linoleum separation is not ideal, sleeve separation measures can reduce the internal force of pile foundation.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU473.1;TU435

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