【作者】 刘毅；

【导师】 邓荣贵；

【作者基本信息】 西南交通大学 ， 岩土工程， 2014， 硕士

【摘要】 据相关资料统计,近年来我国各种不良地质现象平均每年造成经济损失高达上百亿元,其中有关滑坡的地质灾害给人民的生活和国家的建设造成的损失比重最大。传统的抗滑支挡结构在治理滑坡方面取得了一定的成效,但是还难以满足特殊地质条件下滑坡治理的技术与经济要求,因而革新滑坡治理技术,开发出新的适应特殊地质条件下滑坡治理结构成为当前科技工作者的迫切任务。针对传统抗滑支挡结构在治理特殊地质条件下的滑坡的局限性,本文提出了一种新型的抗滑支挡结构即弧形排列抗滑桩支挡结构,并通过计算理论分析、模型试验研究、数值模拟分析和工程应用研究等多种方法,证明其合理性与可行性。主要取得以下研究成果：(1)滑坡后缘呈圆弧状,滑体窄而长,而覆盖层较厚,下滑推力大,两侧及下覆基岩较稳定,这类滑坡可称之为“深槽型”滑坡。就治理此类滑坡而言,从工作原理的角度对多种抗滑支挡结构进行对比分析,弧形排列抗滑桩支挡结构在受力性能方面较优于传统抗滑支挡结构,对此类滑坡的治理是较合适的。(2)分析弧形排列抗滑桩支挡结构型式及其工作机理,应用结构力学、岩土力学基本原理以及抗滑桩设计计算理论推导出该抗滑支挡结构内力及位移的理论计算公式,并验证了其合理性。(3)对弧形排列抗滑桩支挡结构进行物理模型试验研究,试验结果与理论计算结果趋势基本一致,分析产生差异的原因主要为理论计算中桩顶约束简化为铰支,而在模型试验中桩顶与连系梁是粘接在一起的,且试验模型与理论上也有一定差异。(4)应用Abaqus有限元分析软件对弧形排列抗滑桩支挡结构进行三维数值模拟分析,得到抗滑桩和连系梁的内力及位移分布,其整理出的结果与理论计算和模型试验趋势基本一致,他们存在差异的原因主要在于对抗滑结构模型作了不同的简化处理。(5)攀枝花机场滑坡符合“深槽型”滑坡的特点,对攀枝花机场滑坡采用“弧形排列抗滑桩支挡结构”治理方案能够使该滑坡的变形得到有效的控制,并且该抗滑支挡结构的变形相对于普通悬臂抗滑结构更小,因此该抗滑支挡结构能够有效治理此类特殊地质条件下的滑坡,对于类似的滑坡治理具有一定的指导意义。更多还原

【Abstract】 According to the statistics, in recent years all kinds of bad geological phenomenon caused economic losses as high as a hundred billion per year on average in our country,and damage proportion of the landslide geological disasters to people’s life and the country’s construction is the largest. Traditional anti-sliding retaining structure in the landslide control has achieved certain results, but still difficult to meet technical and economic requirements of landslide governance under the special geological conditions. So innovating technology of anti-sliding and developing new landslide governance structure under special geological conditions become the urgent task of current scientific and technical worker.For traditional anti-sliding retaining structure in special geological conditions of landslide governance limitations, this paper proposes a new kind of anti-sliding retaining structure which name arc array of anti-slide pile retaining structure, and through the calculation theoretical analysis, model test research, numerical simulation analysis and engineering application research prove its rationality and feasibility. This paper mainly made the following findings:(1)"Deep groove shape" landslide has distinct characteristics, such as the trailing edge assums circular arc form, the slide body is narrow and long, the coating thickness is big, slide force is great, and the bedrock and both sides of the sliding body is stability,which resistance is larger. From the Angle of the working principle of a variety of anti-sliding retaining structure were analyzed, the arc array of anti-slide pile retaining structure is superior to traditional anti-sliding retaining structure in the aspect of mechanical performance, and it is more suitable for this kind of landslide governance.(2) This paper analysis the form of arc array of anti-slide pile retaining structure and its working mechanism. Application of basic principle of structural mechanics, rock mechanics and the theory of anti-slide pile design calculation deduce the theoretical calculation formula of the anti-sliding retaining structure about internal force and displacement, and its rationality was verified.(3) Physical model experiment of the anti-slide pile retaining structure was carried out, the results trend is consistent with the theoretical calculation, the main reason for the difference is that pile head restraint is simplified to hinge in the theoretical calculation, and pile top is bonding together with connecting beam in the model test, and the test model have some differences from the theory.(4) The Abaqus finite element analysis software was applied to analysis the arc arrangement of anti-slide pile retaining structure in the three dimensional numerical simulation, which get the internal force and displacement distribution of anti-slide pile and connecting beam. The compiled result trend is consistent with the theoretical calculation and model test, the reason that there are differences between them lies in the different simplified processing for anti-sliding structure model.(5) Landslide in panzhihua airport share the characteristics of "deep groove type" landslide. Using "arc array of anti-slide pile retaining structure" governance scheme on panzhihua airport landslide enables to effectively control deformation of the landslide, and the deformation of this structure relative to the ordinary cantilever anti-sliding structure is smaller.So the anti-sliding retaining structure can effectively control such special geological conditions of landslide, and it has a certain guiding significance for similar landslide governance.更多还原