抗滑桩在滑坡治理中的应用及数值模拟
发布时间：2019-06-21 12:16
【摘要】：滑坡是一种全球性的地质灾害，世界上许多国家均遭受的危害。我国幅员辽阔，大约有70%的国土为山区且地形地质复杂，滑坡灾害比较频发。近年来随着国内现代化进程的不断加快，工程建设中遇到的滑坡灾害越来越多，它中断交通、摧毁厂矿、阻塞河道、掩埋村镇，造成人员伤亡和巨大的经济损失。因此进行滑坡的稳定性分析以及结合实际地质情况采取适当的治理措施显得尤为重要。而抗滑桩由于其布置灵活、施工方便、土方量小、工期短等优点，使其作为一种重要的滑坡防止措施被广泛采用。 为了研究抗滑桩的各种参数对滑坡治理工程的影响，本文对滑坡的稳定性分析和抗滑桩的基本理论研究进行了详细的阐述。同时在众多学者研究的基础上结合山西某煤矿滑坡实际治理工程，采用FLAC3D4.0有限差分软件对滑坡建模进行数值模拟分析，，通过逐一改变抗滑桩的桩位布置，锚固深度两种参数，对滑坡开挖引起的周边土体及支护结构的变形进行了研究与分析，得出了有关参数对其影响作用的大小。本文主要成果如下： （1）通过对某煤矿场地滑坡工程的分析并结合本地区同类工程实践经验，利用滑坡的稳定性分析及滑坡防治的基本理论，确定了该滑坡的破坏机理和稳定性。 （2）通过分析对比防治滑坡的各项措施，最终确定了采用抗滑桩的防治措施。再根据抗滑桩设计的基本理论和软件的分析计算，结合该矿区滑坡实际情况对抗滑桩进行设计，认识了抗滑桩在滑坡治理中的重要性。 （3）当在其它参数相同的条件下，抗滑桩桩位布置对滑坡治理的影响很大。桩位布置太高不能够有效地防治滑坡，但抗滑桩布置在滑坡的底部即滑坡推力最低处并非最宜。所以为了充分利用滑坡的抗滑段并保证抗滑桩在最不利滑动面处有合理埋深，一般在滑坡推力分布曲线的反弯点到滑坡出口段布桩比较合理。在该模型中，通过将抗滑桩分别布置在距离坡顶35m、70、105m处分别进行模拟分析，验证了本工程2-2剖面段的设计中将抗滑桩布置在距坡顶70m处是合理的。 （4）抗滑桩埋入滑动面的锚固深度，直接关系到抗滑桩对滑坡的防治效果。抗滑桩锚固深度太小时，滑坡位移不断增大，不能达到滑坡治理的效果。当锚固深度不断加大超过一定范围时，虽然达到了防治效果，但是所增加的抗滑效果不在那么明显，并且造价高很不经济。在该工程中通过取抗滑桩的锚固深度分别为1-5倍的桩径进行模拟分析，最终可知抗滑桩锚固深度取抗滑桩桩径的3-4倍比较确定合理。
[Abstract]:Landslide is a global geological disaster, many countries in the world have suffered harm. China has a vast territory, about 70% of the territory is mountainous and complex topography and geology, landslide disasters occur frequently. In recent years, with the acceleration of domestic modernization, more and more landslide disasters have been encountered in engineering construction. It interrupts traffic, destroys factories and mines, blocks rivers, and buries villages and towns, resulting in casualties and huge economic losses. Therefore, it is particularly important to analyze the stability of landslide and take appropriate treatment measures according to the actual geological conditions. Because of its flexible arrangement, convenient construction, small earthwork quantity and short construction period, anti-slide pile has been widely used as an important landslide prevention measure. In order to study the influence of various parameters of anti-slide pile on landslide treatment engineering, the stability analysis of landslide and the basic theoretical research of anti-slide pile are described in detail in this paper. At the same time, on the basis of many scholars' research, combined with the actual treatment project of a coal mine landslide in Shanxi Province, the FLAC3D4.0 finite difference software is used to simulate and analyze the landslide modeling. By changing the pile position arrangement and anchoring depth of the anti-slide pile one by one, the deformation of the surrounding soil and supporting structure caused by landslide excavation is studied and analyzed, and the influence of the relevant parameters on the deformation is obtained. The main results of this paper are as follows: (1) based on the analysis of landslide project in a coal mine site and the practical experience of similar projects in this area, the failure mechanism and stability of the landslide are determined by using the stability analysis of landslide and the basic theory of landslide prevention and control. (2) through the analysis and comparison of the measures to prevent and control landslide, the prevention and control measures of anti-slide pile are finally determined. According to the basic theory of anti-slide pile design and the analysis and calculation of software, combined with the actual situation of landslide in this mining area, the design of anti-slide pile is carried out, and the importance of anti-slide pile in landslide treatment is recognized. (3) when the other parameters are the same, the location arrangement of anti-slide pile has a great influence on the treatment of landslide. The pile position arrangement is too high to effectively prevent and control the landslide, but the anti-slide pile arrangement at the bottom of the landslide, that is, the lowest thrust of the landslide, is not the most suitable. Therefore, in order to make full use of the anti-slide section of the landslide and ensure that the anti-slide pile has a reasonable buried depth at the most unfavorable sliding surface, it is generally reasonable to arrange the pile at the reverse bending point of the thrust distribution curve of the landslide to the exit section of the landslide. In this model, the anti-slide pile is arranged at 35m from the top of the slope and 70105m from the top of the slope respectively, and it is verified that it is reasonable to arrange the anti-slide pile at 70m from the top of the slope in the design of the 2 鈮
本文编号：2504067
[Abstract]:Landslide is a global geological disaster, many countries in the world have suffered harm. China has a vast territory, about 70% of the territory is mountainous and complex topography and geology, landslide disasters occur frequently. In recent years, with the acceleration of domestic modernization, more and more landslide disasters have been encountered in engineering construction. It interrupts traffic, destroys factories and mines, blocks rivers, and buries villages and towns, resulting in casualties and huge economic losses. Therefore, it is particularly important to analyze the stability of landslide and take appropriate treatment measures according to the actual geological conditions. Because of its flexible arrangement, convenient construction, small earthwork quantity and short construction period, anti-slide pile has been widely used as an important landslide prevention measure. In order to study the influence of various parameters of anti-slide pile on landslide treatment engineering, the stability analysis of landslide and the basic theoretical research of anti-slide pile are described in detail in this paper. At the same time, on the basis of many scholars' research, combined with the actual treatment project of a coal mine landslide in Shanxi Province, the FLAC3D4.0 finite difference software is used to simulate and analyze the landslide modeling. By changing the pile position arrangement and anchoring depth of the anti-slide pile one by one, the deformation of the surrounding soil and supporting structure caused by landslide excavation is studied and analyzed, and the influence of the relevant parameters on the deformation is obtained. The main results of this paper are as follows: (1) based on the analysis of landslide project in a coal mine site and the practical experience of similar projects in this area, the failure mechanism and stability of the landslide are determined by using the stability analysis of landslide and the basic theory of landslide prevention and control. (2) through the analysis and comparison of the measures to prevent and control landslide, the prevention and control measures of anti-slide pile are finally determined. According to the basic theory of anti-slide pile design and the analysis and calculation of software, combined with the actual situation of landslide in this mining area, the design of anti-slide pile is carried out, and the importance of anti-slide pile in landslide treatment is recognized. (3) when the other parameters are the same, the location arrangement of anti-slide pile has a great influence on the treatment of landslide. The pile position arrangement is too high to effectively prevent and control the landslide, but the anti-slide pile arrangement at the bottom of the landslide, that is, the lowest thrust of the landslide, is not the most suitable. Therefore, in order to make full use of the anti-slide section of the landslide and ensure that the anti-slide pile has a reasonable buried depth at the most unfavorable sliding surface, it is generally reasonable to arrange the pile at the reverse bending point of the thrust distribution curve of the landslide to the exit section of the landslide. In this model, the anti-slide pile is arranged at 35m from the top of the slope and 70105m from the top of the slope respectively, and it is verified that it is reasonable to arrange the anti-slide pile at 70m from the top of the slope in the design of the 2 鈮
本文编号：2504067
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