| 贵阳蟠桃宫滑坡的稳定性分析和治理 |
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| 引用本文： | ,李景阳,朱东平,刘寿权.贵阳蟠桃宫滑坡的稳定性分析和治理[J].中国岩溶,2001,20(4):284-289. |
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| 作者姓名： | ,李景阳,朱东平,刘寿权 |
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| 作者单位： | 1. 贵州工业大学资源与环境学院,
2. 贵阳市建筑设计院岩土工程勘察分院, |
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| 摘 要： | 蟠桃宫滑坡位于贵阳市东山南坡,其南边紧接蟠桃宫立交桥,西靠外环东路,东侧为一采石场.该滑坡东西长约70m,南北宽近60m,坡度为40°,其平面形状接近正方形,总面积近5000m2,属岩溶地区的一个小型顺层岩质滑坡.地质上,组成该滑坡体的岩层为三叠系下统安顺组的一套浅灰色厚层状白云岩和紫红色薄层至中厚层状含铁质白云岩和泥页岩互层;构造上,蟠桃宫滑坡为贵阳向斜东冀和东山断层南盘.整个滑体为一倾向南西的单斜构造.蟠桃宫滑坡的形成原因主要是人为修筑机场路开挖边坡,产生临空面,然后由于降水下渗进入滑体内部,尤其是经过后缘的一较大溶蚀裂隙渗透至泥页岩层使之软化成软弱夹层即泥化夹层,进而使其抗剪强度下降,导致整个滑坡体出现失稳而滑动,并引起山坡上许多民房地面及墙面开裂.根据地面地质调查,滑坡前缘及后缘等均形成纵向和横向的拉张裂隙.无疑,若不及时治理,一旦山体失稳滑动将会对人民生命及财产造成巨大的损失.本文主要涉及的问题包括对蟠桃宫滑坡产生滑动原因和力学机理的探讨,对其评价和治理方法的优选,以及治理后对滑坡的变形观测和评估等.该滑坡体的稳定性分析,主要是通过在现场地质和水文地质条件调查的基础上,对滑动带内的三个软弱夹层(即可能的滑动面)分别取扰动土样送室内作抗剪试验,并计算其相关的土力学参数.据此,在其后缘溶蚀裂隙充水的情况下计算最危险的第三个滑动面的抗滑稳定系数Fs值.计算结果表明,第三个滑动面的Fs值为1.09,接近极限平衡状态,在外界因素影响下,很可能产生进一步的滑动.在对蟠桃宫滑坡的评价和治理上,通过对几种方法比较和论证认为,采用预应力锚索为主要的治理手段并与其它辅助手段相结合的方法,无论从经济上还是安全上都为最优的选择.通过在滑坡体的四个主要裂隙上设置9个观测点做原位变形观测证明,在使用预应力锚索治理过后整个滑坡体是稳定的.
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| 关 键 词： | 滑坡 稳定性 治理 预应力锚索 |
| 文章编号： | 1001-4810(2001)04-0284-07 |
| 修稿时间： | 2001年8月28日 |
STABILITY ANALYSIS AND CONTROL OF PANTAOGONG LANDSLIDE OF GUIYANG CITY |
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| LIU Kang-xiang,LI Jing-yang,ZHU Dong-ping and LIU Shou-quan.STABILITY ANALYSIS AND CONTROL OF PANTAOGONG LANDSLIDE OF GUIYANG CITY[J].Carsologica Sinica,2001,20(4):284-289. |
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| Authors: | LIU Kang-xiang LI Jing-yang ZHU Dong-ping and LIU Shou-quan |
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| Institution: | 1.Resoursces and Environment College of Guizhou University of Technology 2.Geotechnical Engineering Division of Guiyang Construction and Design Academy,1.Resoursces and Environment College of Guizhou University of Technology 2.Geotechnical Engineering Division of Guiyang Construction and Design Academy,1.Resoursces and Environment College of Guizhou University of Technology 2.Geotechnical Engineering Division of Guiyang Construction and Design Academy and 1.Resoursces and Environment College of Guizhou University of Technology 2.Geotechnical Engineering Division of Guiyang Construction and Design Academy |
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| Abstract: | Pantaogong landslide located at Eastern Hill of Guiyang city is a consequently rocky one on a small scale in a typical karst terrain.This article deals mainly with genesis discussion of the landslide and physical mechanism analysis of three weak intercalations as well as optimal selection of control measures.An in situ geological and hydrogeological investigation in this area was carried out in more detail.Shear strength tests of disturbed and remolded soil samples collected from three siltized intercalations were made under saturation condition in the laboratory.Major indexes concerning with physical and mechanics properties were obtained from the tests.Considering that a large solution fissure in the rear was filled with water which can infiltrate along the slide planes,based on a limit equilibrium theory of the single slide surface of rigid body,some related parameters were computed appropriately and calculated results were used to assess the stability of the landslide.In addition,a field deformation observation at major fissures on the landslide was completed after prestressed anchor ropes had been installed within the landslide body.It is indicated from the deformation observation that prestressed anchor rope technique is one of most effective approches in landslide control and it is apparent that the landslide is stable after treatment. |
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| Keywords: | Pantaogong landslide Solution fissure Siltized intercalations Deformation observation Prestress anchor rope |
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