攀枝花机场12#滑坡运动过程及机理的数值模拟研究
发布时间：2018-09-03 09:58
【摘要】：攀枝花机场12#滑坡位于机场北段东侧一宽缓沟谷区的上部总体积约510×104m3,系由填筑体失稳、下方俞家坪老滑坡复活而成。由于填筑体的体量相对与易家坪老滑坡的体量是很小的,从纵向长度上,前者仅相当于后者1/10,为何体量如此小的填筑体失稳会导致体量很大的老滑坡复活,从影响因素到内在力学机理过程上,都是值得深入研究的。本文通过对研究区自然地理及地质环境条件复核,以及滑坡体变形失稳及老滑坡复活特征研究,通过数值模拟分析了降雨前后12#滑坡渗流场的变化,以及12#滑坡失稳破坏过程,试图揭示12#填筑体失稳及易家坪老滑坡复活机理,以丰富人们对山区机场“高位填方体失稳-低位滑坡复活”这种灾害链发生机理的认识。取得了如下成果:1.阐述了填筑体失稳及老滑坡复活机理的概念模型分析,长期降雨导致填筑体饱水软化,并在地下水渗流作用下,填筑体不断地变形,最终失稳垮滑。2.利用seep软件分析降雨前后12#滑坡的渗流-应力场变化,降雨前后坡脚处地下水位变化最为明显,填筑体、砂岩、老滑坡的渗透性对渗流场均有不同影响。3.通过颗粒流软件PFC2D分析了填筑体失稳以及老滑坡复活过程,表明填筑体失稳后是以垮滑的形式超覆于老滑坡体,对老滑坡体的冲击力随水平方向呈滞后性,在垂直方向上作用随深度减小。4.建立巨滑后残坡体数值模型,分析了残坡体的再变形机理,结果表明,天然工况下残坡体处于蠕滑状态,暴雨作用下残坡体后缘处应力-应变变化最为明显,最终再次失稳复活。
[Abstract]:The No. 12 landslide of Panzhihua Airport is located in the upper part of the east part of the northern section of the airport, the total volume of which is about 510 脳 10 ~ 4m ~ (3), which is formed by the instability of the filling body and the resurrection of the old landslide at the bottom of Yujiaping. Because the volume of the fill is relatively small to that of the old landslide in Yijiaping, the former is only one tenth of the size of the latter in terms of longitudinal length. Why does the instability of such a small volume of the filling lead to the revival of a large number of old landslides? In the process of influencing factors and internal mechanics mechanism, it is worth studying deeply. In this paper, the physical geography and geological environment of the study area are reviewed, and the deformation instability of landslide and the characteristics of old landslide are studied. The variation of seepage field of 12 # landslide before and after rainfall and the failure process of 12 # landslide are analyzed by numerical simulation. This paper attempts to reveal the mechanism of the instability of the No. 12 filling body and the resurrection of the old landslide in Yijiaping, in order to enrich the understanding of the mechanism of the disaster chain of "the instability of the high filling body and the resurrection of the low landslide" in the mountainous airport. The following results have been achieved: 1. This paper describes the conceptual model analysis of the instability of the filling body and the resurrection mechanism of the old landslide. The long-term rainfall causes the filling body to soften, and under the action of the groundwater seepage, the filling body is constantly deformed, and finally the instability collapses. 2. The seepage stress field of 12 # landslide before and after rainfall is analyzed by seep software. The change of groundwater level at the foot of slope is most obvious before and after rainfall. The permeability of filling body, sandstone and old landslide all have different influence on seepage field. The instability of the filling body and the resurrection process of the old landslide are analyzed by the particle flow software PFC2D. The results show that the rockfill overrides the old landslide in the form of collapse after the instability, and the impact force on the old landslide is delayed with the horizontal direction. In the vertical direction, the action decreases with depth. A numerical model of residual slope body after giant slide is established, and the mechanism of redeformation of residual slope body is analyzed. The results show that the residual slope body is in creep state under natural conditions, and the stress-strain change is most obvious in the rear edge of residual slope body under the action of torrential rain. Finally, it was unstable and resurrected again.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P642.22
本文编号：2219641
[Abstract]:The No. 12 landslide of Panzhihua Airport is located in the upper part of the east part of the northern section of the airport, the total volume of which is about 510 脳 10 ~ 4m ~ (3), which is formed by the instability of the filling body and the resurrection of the old landslide at the bottom of Yujiaping. Because the volume of the fill is relatively small to that of the old landslide in Yijiaping, the former is only one tenth of the size of the latter in terms of longitudinal length. Why does the instability of such a small volume of the filling lead to the revival of a large number of old landslides? In the process of influencing factors and internal mechanics mechanism, it is worth studying deeply. In this paper, the physical geography and geological environment of the study area are reviewed, and the deformation instability of landslide and the characteristics of old landslide are studied. The variation of seepage field of 12 # landslide before and after rainfall and the failure process of 12 # landslide are analyzed by numerical simulation. This paper attempts to reveal the mechanism of the instability of the No. 12 filling body and the resurrection of the old landslide in Yijiaping, in order to enrich the understanding of the mechanism of the disaster chain of "the instability of the high filling body and the resurrection of the low landslide" in the mountainous airport. The following results have been achieved: 1. This paper describes the conceptual model analysis of the instability of the filling body and the resurrection mechanism of the old landslide. The long-term rainfall causes the filling body to soften, and under the action of the groundwater seepage, the filling body is constantly deformed, and finally the instability collapses. 2. The seepage stress field of 12 # landslide before and after rainfall is analyzed by seep software. The change of groundwater level at the foot of slope is most obvious before and after rainfall. The permeability of filling body, sandstone and old landslide all have different influence on seepage field. The instability of the filling body and the resurrection process of the old landslide are analyzed by the particle flow software PFC2D. The results show that the rockfill overrides the old landslide in the form of collapse after the instability, and the impact force on the old landslide is delayed with the horizontal direction. In the vertical direction, the action decreases with depth. A numerical model of residual slope body after giant slide is established, and the mechanism of redeformation of residual slope body is analyzed. The results show that the residual slope body is in creep state under natural conditions, and the stress-strain change is most obvious in the rear edge of residual slope body under the action of torrential rain. Finally, it was unstable and resurrected again.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P642.22
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