抗滑桩—拱形系板—挡土墙组合结构治理滑坡计算方法研究

发布时间：2018-01-11 22:31

本文关键词：抗滑桩—拱形系板—挡土墙组合结构治理滑坡计算方法研究　出处：《西南交通大学》2017年硕士论文　论文类型：学位论文

【摘要】：本文依托马家坡滑坡提出了一种适用于"V"字形沟谷地带中小型滑坡治理的新型抗滑体系—抗滑桩-拱形系板-挡土墙组合结构,即抗滑桩、挡土墙通过拱形系板连接而成的联合支挡结构。采用理论分析和数值模拟相结合的方法,对该结构体系受力机理、受力特点、内力计算方法进行了研究。(1)依据现有的拱、抗滑桩、挡土墙以及结构力学的相关理论,结合"V"字形沟谷地带滑坡的特点,确定结构体系中拱形系板拱轴线为悬链线,挡土墙采用重力式挡土墙,抗滑桩为普通桩。抗滑桩与拱形系板、挡土墙与拱形系板均采用固定铰支座进行连接,该支挡结构沿滑坡前缘顺河道纵向布置。(2)抗滑桩-拱形系板-挡土墙结构体系为一次超静定结构,本文在研究过程中,滑坡推力计算采用传递系数法,拱板内力计算采用近似的悬链线双铰拱模型,抗滑桩内力采用悬臂法和地基系数法,重力式挡土墙内力利用静力平衡条件得出。结合结构力学以及材料力学知识对不同地质情况下整个结构体系中拱形系板、抗滑桩、挡土墙等的内力计算公式进行了推导,采用迭代法对体系中各构件连接处位移进行修正。得出了一套完整的抗滑桩-拱形系板-挡土墙组合结构内力计算公式以及稳定性验算公式。(3)采用马家坡滑坡工程地质模型对所推导出的理论公式进行验算,结合实地勘察资料,对滑坡的地形地貌和工程地质条件进行分析,采用工程地质类比法和室内试验确定岩土体物理力学参数,并采用传递系数法对3个剖面不同剪出口的稳定性系数和剩余下滑力进行计算。滑坡Ⅱ-Ⅱ断面为主断面,暴雨工况下易从坡脚处剪出,稳定性系数为0.979,处于不稳定状态,亟待治理。(4)根据实际工程地质条件及地形地貌,抗滑桩-拱形系板-挡土墙组合结构在治理马家坡滑坡时各结构尺寸分别为:拱板厚度0.8m,跨度3.0m,矢高0.5m;抗滑桩截面尺寸为2.5m×3.0m,桩长7m,滑面以上3m,滑面以下4m;挡土墙高4.5m,顶面宽度1.5m,底面宽度3.0m。采用所推导理论公式对组合结构所受内力进行计算,并知桩顶最大位移为0.023m,并对体系稳定性进行验算,结果符合相关规定。(5)利用GID软件和FLAC3D数值模拟软件,建立马家坡滑坡Ⅱ-Ⅱ断面以及滑坡整体三维数值模型,模拟自然状态和暴雨两种常见工况,分析了滑坡的稳定性。Ⅱ-Ⅱ剖面在自然和暴雨工况下安全性系数为1.06、0.95,滑坡整体在自然和暴雨工况下安全性系数为1.08、0.98,滑坡在暴雨工况下处于不稳定状态。(6)对采用抗滑桩-拱形系板-挡土墙组合结构治理后的马家坡滑坡Ⅱ-Ⅱ断面在暴雨工况下稳定性及组合结构内力进行数值模拟分析。治理后滑坡稳定,且组合结构内力分布形式与理论计算得出的内力分布形式一致,证明所推导的理论公式科学合理。
[Abstract]:On the basis of magupo landslide is proposed for a "V" shaped valley areas in small landslide of new anti slip system and anti slide pile - arched plate retaining wall structure, namely, anti slide pile, retaining walls connected by arched plate and the combined retaining structure by using the method of theory. Analysis and numerical simulation, the structural stress mechanism, stress characteristics, internal force calculation method is studied. (1) on the basis of the existing arch anti slide pile, retaining wall and structural mechanics theory, combined with the "V" shaped Valley landslide characteristics, determine the arch structure in the plate arch axis is catenary, retaining wall with gravity retaining walls, anti slide pile for common pile. Anti slide pile with arched plate, retaining wall and arch plate adopts fixed hinge bearing to connect the retaining structure along the longitudinal direction along the front edge of the landslide anti slide pile (2). Arch Shaped plate retaining wall structure system is a statically indeterminate structure, in the process of research, transfer coefficient method to calculate the landslide thrust calculation using the approximate model of catenary arch arch cantilever method and internal force of anti slide pile internal force of foundation coefficient method, gravity retaining wall internal force by using the static balance the conditions obtained. Combining with structural mechanics and material mechanics knowledge of arch in different geologic condition of the whole structure of system board, anti slide pile, retaining wall and the internal force calculation formulas were deduced, the various components of the system of joint displacement is corrected by iterative method. Obtained a complete set of anti slide pile arch plate - retaining wall internal force calculation formula and stability calculation formula. (3) the geological model of magupo landslide engineering theory formula derived by checking, combined with field survey data, on the slippery slope of the terrain Analysis of landform and geological conditions, the engineering geological analogy method and laboratory test to determine the physical and mechanical parameters of rock and soil, and the coefficient of stability in 3 sections in different shearing transfer coefficient method and residual sliding force are calculated. The landslide II - II sections of the main section, the storm conditions easily cut out from the foot of the slope, stability the coefficient is 0.979, in an unstable state, urgent treatment. (4) according to the actual geological conditions and topography, anti slide pile - arched plate retaining wall composite structure in magupo landslide governance structure dimensions respectively: arch plate thickness 0.8m, span 3.0m, height 0.5m; anti slide pile the size of 2.5m * 3.0m, the length of pile above the sliding surface 7m, 3M, 4m under sliding surface; the top surface of the retaining wall height 4.5m, width 1.5m, bottom width 3.0m. of the theoretical formula of composite structure internal force calculation, and the maximum displacement of the pile head is 0 .023m, and checking the stability of the system, the results comply with the relevant regulations. (5) numerical simulation using GID software and FLAC3D software, establish magupo II II landslide section and 3D numerical simulation of landslide model, natural state and heavy rain of two common conditions, the stability of landslide is analyzed in Section II. II - natural and stormconditions safety coefficient is 1.06,0.95, the whole landslide in the natural and stormconditions safety coefficient is 1.08,0.98, the landslide is in unstable state in heavy rain conditions. (6) of the anti slide pile - arched plate retaining wall combined structure of governance after magupo landslide stability and section II - II the combination of structural internal force under heavy rain conditions. The numerical simulation analysis of landslide stability, uniform distribution and form of internal force combination structure of the internal force distribution and theoretical calculation, the derived formula of theoretical proof and Science Daniel.

【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P642.22;TU753.8

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