【作者】 李亚平；

【导师】 陈昌富；

【作者基本信息】 湖南大学 ， 岩土工程， 2006， 硕士

【摘要】 近年来,抗滑桩尤其是预应力锚索抗滑桩已广泛地应用于滑坡防治工程中。但其设计理论研究却滞后于工程应用。目前国内外对抗滑桩的研究,除试验研究外,主要采用传统的悬臂梁法、地基系数法及弹性力学方法来进行分析。本文在前人的研究基础上,通过对抗滑桩相关设计计算理论进行研究,包括抗滑桩与边坡岩土体的相互作用,抗滑桩的土拱效应模型以及抗滑桩预应力锚索的内力计算方法进行分析。具体作了以下几方面工作:首先,综合分析了抗滑桩及预应力锚索抗滑桩的国内外研究动态。在滑坡剩余下滑力的计算方法上,改良传递系数法,提出了精度更高,适用范围更广泛的广义不平衡推力法。其次,对现行的抗滑桩计算方法的地基系数法进行有限元模拟,使用大型有限元软件ANSYS,建立抗滑桩和预应力锚索的有限元模型,利用弹簧模拟岩土体对桩的作用。并对一般抗滑桩与预应力锚索抗滑桩的受力和变形进行了对比分析,得到了一些有价值的结论。再次,在对前人有关桩土相互作用的研究进行分析的基础上,应用土拱理论分析了滑坡推力在抗滑桩和桩间岩土体之间的传递机理。建立了模拟抗滑桩与土体土拱效应的平面土拱模型,研究了桩间土土拱效应的主要影响因素。以此指导桩径和桩间距的确定。提出了抗滑桩桩间距的合理范围。最后,基于地基系数法和有限杆单元法,建立了预应力锚拉抗滑桩分析计算模型,并编制了计算程序。并分析了不同锚索预应力作用下抗滑桩桩身的受力和变形情况,以得出预应力锚拉抗滑桩的最优锚索预应力。更多还原

【Abstract】 There is extensive application of anti-slide pile in slide treatment in resent years, especially those with prestressed anchor cables. However, the design theory lags behind engineering application. The design and calculation lacks guidance such as corresponding specifications. Besides experiments, the present domestic and abroad study on anti-slide pile is mainly analysis by traditional cantilever beam method, foundation coefficient method and elastic mechanic method.On the basis of previous studies, this paper carries out a research on relevant design and calculation theory about anti-slide piles, comprising the interaction between anti-slide piles and rock and soil of side slopes, the soil arching model of anti-slide piles and the internal stress calculation method of prestressed anchor cables. The following parts are included in detail.Firstly, a synthesize analysis is carried out on the developments of domestic and abroad studies about anti-slide piles and those with prestressed anchor cables. On basis of the calculation method of residue sliding force, the transfer coefficient method is improved to obtain the slide block balance method, the application scope of which is wider.Secondly, the foundation coefficient method, which is the calculation method of anti-slide piles, is simulated by finite element method. The large scale finite element software ANSYS is adopted to establish finite element model of anti-slide piles and prestressed anchor cables. Springs are used to simulate the action on piles by soil and rocks. The bearing performance of anti-slide piles and those with prestressed anchor cables are compared by illustration examples.Thirdly, on basis of analyzing the previous studies about pile-soil interaction, soil arching theory is applied to analyze the transfer mechanism of sliding thrust between anti-slide piles and soil and rock among piles. A plane soil arch model is established and used to simulate the soil arch effect between anti-slide piles and soil and to study the main influencing factors as well. This serves as a guide for determining the pile diameter and space between piles.Finally, the design and calculation method of prestressed anchor cables of anti-slide piles is studied. On basis of foundation coefficient method and finite element method, the anti-slide piles are dispersed to be rod element. The main更多还原