文县碧峰村滑坡成因分析及治理

发布时间：2018-04-04 17:37

本文选题：滑坡成因　切入点：滑坡稳定性　出处：《兰州大学》2017年硕士论文

【摘要】：碧口镇是甘肃文县东南部的一个边陲古镇,坐落于白龙江的河流阶地之上,被群山环绕,同甘肃省其他许多城镇一样,发育有滑坡灾害。自2008年至2013年,碧口镇碧峰村先后发育H1滑坡及其上次级滑坡群H1-1、H1-2、H1-3,H2滑坡和其上次级滑坡H2-1,以及X1滑坡。滑坡变形形成的裂缝和溜滑,给当地人民带来巨大心理压力,严重威胁着人民的生命财产安全。本文以碧峰村滑坡为研究对象,通过实地调查和查阅资料,探索了滑坡的成因;采用GEO5软件,利用极限平衡法对滑坡进行了三种工况下的稳定性计算;针对滑坡的发育背景和已有工程状况,提出了滑坡防治方法;计算不同抗滑桩方案的受力性能和资金投入,对比获得最优抗滑桩尺寸。通过研究,本文取得以下成果:(1)滑坡组成土体的结构差、物理力学性质不稳定是滑坡发育最重要的条件,除H1滑坡变形因地震诱发,其余滑坡变形均由降雨诱发。(2)在自重工况下,H1滑坡和H2滑坡稳定,H2-1滑坡欠稳定,其余滑坡基本稳定;在自重+暴雨工况下,H2滑坡稳定,H1滑坡基本稳定,H1-2滑坡欠稳定,其余滑坡不稳定;在自重+地震工况下,H2滑坡处于稳定状态,H1滑坡基本稳定,H1-1、H1-2滑坡欠稳定,其余滑坡不稳定。(3)对于H1滑坡,采用抗滑桩+挡土板+截、排水渠的治理方案;对于H2滑坡,采用锚杆格构+挡土板+截、排水渠的治理方案;对于X1滑坡,采用锚杆格构+截、排水渠的治理方案。(4)在满足安全的前提下,截面尺寸为2.4×1.8m,桩长29m,桩间距6m的抗滑桩方案相比其他抗滑桩方案更经济。
[Abstract]:Bikou Town is an ancient frontier town in the southeast of Wenxian County Gansu Province. It is located on the river terrace of Bailong River surrounded by mountains and has landslide disaster like many other towns in Gansu Province.From 2008 to 2013, Bifengcun, Bikou town, successively developed H1 landslide and its last landslide group H1-1H1-2H1-3H1-3H2-1 and its upper secondary landslide H2-1, as well as X1 landslide.The cracks and slippage caused by landslide deformation bring great psychological pressure to local people and threaten the safety of people's life and property.This paper takes Bifengcun landslide as the research object, through field investigation and reference data, explores the cause of the landslide, uses GEO5 software, using limit equilibrium method to calculate the stability of landslide under three working conditions.According to the development background of landslide and the existing engineering situation, this paper puts forward the landslide prevention method, calculates the mechanical performance and capital investment of different anti-slide pile schemes, and obtains the optimal size of anti-slide pile by comparison.In this paper, the following results are obtained: (1) the structure of the landslide is poor, and the instability of physical and mechanical properties is the most important condition for the landslide development, except that the deformation of the H1 landslide is induced by earthquake.The deformation of other landslides is induced by rainfall. (2) under deadweight conditions, the H _ 1 landslide and H _ 2 landslide are unstable, while the other landslides are basically stable, while the H _ 2 landslide is basically stable under the condition of heavy rainfall, and the H _ 1 landslide is basically stable under the condition of heavy rainfall.The other landslides are unstable, the H _ 2 landslide is in a stable state under the condition of deadweight earthquake, and the H1-1H _ 1 landslide is not stable, and the other landslide is not stable. (3) for the H _ 1 landslide, the anti-slide pile retaining plate is adopted and the drainage channel is treated.For the H _ 2 landslide, the treatment scheme for the H _ 2 landslide is to adopt the anchor latticed retaining plate and drainage canal; for the X _ 1 landslide, the anchor bar lattice section is adopted, and the drainage canal treatment scheme is used. (4) on the premise of satisfying the safety,The anti-slide pile with a cross section of 2.4 脳 1.8 m, a length of 29 m and a distance of 6 m is more economical than other anti-slide pile schemes.
【学位授予单位】：兰州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P642.22

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