预加固高填方边坡的滑动机制：攀枝花机场12#滑坡

SLIDING MECHANISM OF HIGH-FILL SLOPE WITH PRE-REINFORCED PILES AT PANZHIHUA AIRPORT

近年来,高填方边坡失稳给山区机场建设和运营带来了严重影响。本文以攀枝花机场12#滑坡为研究实例,阐述了高填方边坡的滑动失稳机制及其稳定性支护措施的有效性。论文首先介绍了滑坡的地质环境、滑坡基本特征及边坡的预加固方案。在对滑坡的形成条件及其影响因素分析的基础上,结合数值模拟,揭示了12#滑坡的形成机制及其变形发展过程。研究表明,导致滑坡的主导因素包括:填方边坡底部的软弱泥岩层、边坡内部丰富的地下水、边坡加固桩不合理的布置以及强降雨。12#滑坡的形成机制可以概括为:推移式蠕滑-累进性剪断-溃滑与超覆。

The failure of some high fill slopes in recent years has caused serious aftereffects to the safety of moun tain airports. This paper takes the No. 12 landslide of high fill slopes in Panzhihua airport as an example to discuss the sliding mechanism and the reinforced countermeasures of a high fill slope in mountain airport. The geological background and basic features of the No. 12 landslide in the high fill slopes and its pretreatment schemes are de scribed. The phenomena and process of deformation and failure for the landslide are also introduced in detail. The analysis of formation conditions and influence factors as well as the numerical modeling has revealed the formation mechanism and evolution process of No. 12 landslide. Research results show that the main reasons resulted in the landslide are the soft mudstone layer in the bottom of fill slope, the abundant groundwater in the fill slope, the un reasonable layout of prereinforcement piles and the inducement of storm rainfall. The mode of the formation mecha nism of the No. 12 landslide is summarized as push creepinglocking and progressive shearingbreak sliding and overlapping.