乐山滑坡稳定性评价及抗滑桩加固数值模拟分析
发布时间：2018-09-14 15:27
【摘要】：滑坡与地震、洪水并列为世界范围内的三大自然灾害之一,滑坡会导致交通中断、河道堵塞,乡村城镇被掩埋,对人类生命财产构成巨大危害。我国是一个多山的国家,尤其是我国西部地区和东南沿海的福建、广西、广东、海南等地。据统计全国约有67%的面积属于山地,滑坡发生的频率和数量在世界范围内都属于较多的。乐山滑坡属于大型滑坡,研究乐山滑坡加固具有重大的社会效益和工程意义。主要研究了四方面的内容:1)定性分析乐山滑坡产生机理。通过实地勘探、钻孔取样等方式,查明了乐山滑坡水文地质工程地质条件,滑坡体主要裂缝分布及其特征。结论为:地质条件是乐山滑坡产生的主要原因,滑坡前缘乡村公路修建时形成的高约3~5m的边坡等因素是次因。2)采用传递系数法分析坡体无加固时在天然状况、暴雨和地震作用等三种工况下的稳定系数,并进行稳定系数受重度γ、C、φ三个参数影响的敏感性分析。在天然状态下及地震工况下,该滑坡整体是稳定的,在暴雨饱和状态工况下,滑坡整体处于欠稳定~基本稳定状态。3)基于层次分析法,考虑技术、经济、安全和环境因素,建立了滑坡加固方案评价体系。并通过专家打分对乐山滑坡抗滑桩加固与锚索加固两种方案进行了比选。4)基于有限差分数值分析法,采用岩土大型软件FLAC3D对抗滑桩加固乐山滑坡进行数值模拟,系统地研究抗滑桩横截面尺寸、桩间距、桩的设置位置这三个关键参数对滑坡体滑移特征、坡体塑性区分布、坡体剪切应变增量、坡体节点位移以及桩身位移、桩身弯矩、桩身剪力的影响。得出主要结论如下:(1)桩间距主要影响抗滑桩加固圈大小,对桩身受力变形也有部分影响;(2)抗滑桩设置位置主要影响滑坡体的滑移最大值和坡顶处塑性区面积,对桩身受力变形影响较小;(3)桩尺寸主要影响桩身受力变形及加固圈的变形,由于计算不考虑抗滑桩的破坏,桩尺寸对滑坡体影响较小。桩尺寸越大,桩身受力越大、变形越小,加固圈变形也越小。
[Abstract]:Landslides, earthquakes and floods are listed as one of the three natural disasters in the world. Landslides can lead to traffic disruption, River blockage, burial of rural towns and villages, and cause great harm to human life and property. China is a mountainous country, especially in the western region of China and the southeastern coastal areas of Fujian, Guangxi, Guangdong, Hainan and other places. About 67% of the country belongs to mountainous areas, and the frequency and quantity of landslides are more in the world. Leshan landslide belongs to large-scale landslides. It is of great social benefit and engineering significance to study the reinforcement of Leshan landslide. By sampling and other methods, the hydrogeological engineering geological conditions of Leshan landslide, the distribution and characteristics of main cracks in the landslide body were found out. The stability coefficients of the landslide under natural conditions, rainstorm and earthquake are analyzed and the sensitivity of the stability coefficients affected by the three parameters of gravity y y, C and phi is analyzed. Based on the analysis method, considering the technical, economic, safety and environmental factors, the evaluation system of the landslide reinforcement scheme is established. The two schemes of the anti-slide pile reinforcement and the anchor cable reinforcement of Leshan landslide are compared and selected through the expert scoring. 4) Based on the finite difference numerical analysis method, the numerical model of the anti-slide pile reinforcement of Leshan landslide is established by using the large-scale geotechnical software FLAC3D. In this paper, the influence of the three key parameters of anti-slide piles, i.e. cross-section size, pile spacing and pile setting position, on the sliding characteristics of landslide, the distribution of slope plastic zone, the increment of slope shear strain, the displacement of slope nodes, the displacement of pile body, the bending moment of pile body and the shear force of pile body are studied systematically. The size of the retaining ring also has some influence on the deformation of the pile body; (2) The location of the anti-slide pile mainly affects the maximum slip of the landslide body and the area of the plastic zone at the top of the slope, but has little effect on the deformation of the pile body; (3) The pile size mainly affects the deformation of the pile body and the deformation of the reinforcement ring, because the calculation does not take into account the failure of the anti-slide pile, the pile size on the slide. The larger the pile size is, the greater the stress and the smaller the deformation of the pile, the smaller the deformation of the reinforcing ring.
【学位授予单位】：东华理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P642.22;TU753.8
本文编号：2243106
[Abstract]:Landslides, earthquakes and floods are listed as one of the three natural disasters in the world. Landslides can lead to traffic disruption, River blockage, burial of rural towns and villages, and cause great harm to human life and property. China is a mountainous country, especially in the western region of China and the southeastern coastal areas of Fujian, Guangxi, Guangdong, Hainan and other places. About 67% of the country belongs to mountainous areas, and the frequency and quantity of landslides are more in the world. Leshan landslide belongs to large-scale landslides. It is of great social benefit and engineering significance to study the reinforcement of Leshan landslide. By sampling and other methods, the hydrogeological engineering geological conditions of Leshan landslide, the distribution and characteristics of main cracks in the landslide body were found out. The stability coefficients of the landslide under natural conditions, rainstorm and earthquake are analyzed and the sensitivity of the stability coefficients affected by the three parameters of gravity y y, C and phi is analyzed. Based on the analysis method, considering the technical, economic, safety and environmental factors, the evaluation system of the landslide reinforcement scheme is established. The two schemes of the anti-slide pile reinforcement and the anchor cable reinforcement of Leshan landslide are compared and selected through the expert scoring. 4) Based on the finite difference numerical analysis method, the numerical model of the anti-slide pile reinforcement of Leshan landslide is established by using the large-scale geotechnical software FLAC3D. In this paper, the influence of the three key parameters of anti-slide piles, i.e. cross-section size, pile spacing and pile setting position, on the sliding characteristics of landslide, the distribution of slope plastic zone, the increment of slope shear strain, the displacement of slope nodes, the displacement of pile body, the bending moment of pile body and the shear force of pile body are studied systematically. The size of the retaining ring also has some influence on the deformation of the pile body; (2) The location of the anti-slide pile mainly affects the maximum slip of the landslide body and the area of the plastic zone at the top of the slope, but has little effect on the deformation of the pile body; (3) The pile size mainly affects the deformation of the pile body and the deformation of the reinforcement ring, because the calculation does not take into account the failure of the anti-slide pile, the pile size on the slide. The larger the pile size is, the greater the stress and the smaller the deformation of the pile, the smaller the deformation of the reinforcing ring.
【学位授予单位】：东华理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P642.22;TU753.8
【参考文献】
中国期刊全文数据库 前1条
1 沈珠江;桩的抗滑阻力和抗滑桩的极限设计[J];岩土工程学报;1992年01期
，本文编号：2243106
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