【作者】 李腾；

【导师】 俞宗卫；

【作者基本信息】 长安大学 ， 岩土工程， 2010， 硕士

【摘要】 目前,制约延安城市发展的一大主要因素是其所处的黄土高原梁峁地形。狭长的川道和错落的峁梁直接导致延安市建设用地日益紧张、市区逐渐向川道两旁坡地延伸,由此带来的建筑边坡安全成了重点关注的问题。双排桩作为一种新型支护结构,凭借其具备的诸多优良特点使这一工法已在南方及沿海地区得到较为广泛的应用。但当下关于双排桩支护结构的理论研究尚落后于实践应用,尤其在黄土梁峁地区的相关研究与应用更加不够成熟。本文根据双排桩支护结构的研究现状,主要进行了以下研究工作：首先,整理并总结了现有边坡稳定性计算的极限平衡法与数值分析法,并应用数值分析法中的有限元法对延安马家湾小区某开挖整平形成的边坡的稳定性进行分析论证,同时确定边坡具体的稳定安全系数值；其次,将双排桩支护结构引入延安马家湾小区1#地块高边坡支护工程中,借助ANSYS10.0有限元程序建立模型进行模拟分析,将有限元计算结果与理论计算结果进行对比,二者计算结果吻合较好,证明本文双排桩计算方法是可行的；最后,本文对影响其性能的主要要因素如桩距、连梁刚度、桩长及主动区、被动区和桩间土体加固等进行了分析讨论,得出了一系列重要结论,从而为双排桩支护结构在延安及其它黄土地区的应用与推广提供了有益的参考。更多还原

【Abstract】 Currently,the main factor that restrict the development of Yanan is the location of the loess plateau. Narrow ditch and the ridge strewning at random derectly cause the shortage of land for construction purposes, as well as the urban extend to the sides of road. As a result,the security of slope engineering become widesprade concern.Double-row piles, as a kind of new engineering measure, has been used windly in the south regions and coastal areas due to lots of excellent characteristics.But resently,the research of double-row piles supporting structure is behind of the application in engineering, especially in loess areas.According to the research status of double-row pile supporting structure, following work has been done:first, organize and summarize the existing slope stability calculation methods named limit equilibrium method and numerical analysis method, and the finite element method-one of the limit equilibrium method-is applied to the stability analysis of excavation leveling formation of slope in Yanan, for purpose of determining the specific value of slope safety factor; Second, use double row pile supporting structure in the high slop retaining engineering of Majiawan in Yanan. Modeling by finite element program ANSYS10.0 and simulating. We compared the finite element calculation result with the theoretical calculation results.The well fitted result can prove that the double-row pile calculation method is feasible. Finally, some main influencing factors of double-row pile such as the space of rows、stiffness of the joining beam、the length of pile,as well as the reinforce depth of active area、passive area and soil between the tow rows, were analyzed and discussed. At the same time,a series of important conclusion is obtained, which provide the beneficial reference for the application and popularization of double-row pile supporting structure in Yanan and other loess areas.更多还原