The Deformational Mechanism And Countermeasures Of High Fill Slope

In recent years, with the rapid development of China's national economy and the implementation of the western development strategy, our country increased the strength of infrastructure development, so the airport construction in Southwest of China has entered the rapid development phase. These airports had some common features including a high fill and high high earthquake intensity, poor weather conditions, complex geological condition of field areas. As the artificial high fill slope, many slope geological disaster problems were displayed more and more prominent, while the landslide slope disaster as slope instability which is the most common geological disaster caused serious damage to life and property of all peoples and economic development, and the damage range is also growing.NO.12 landslide of Panzhihua Airport high fill slope is a typical of many landslide disasters which is occured at fifteen o'clock on October 3, 2009. In this thesis, it takes NO.12 landslide as the object of study, through the field investigation and the existing data, identifying the regional geological conditions incuding lithology, topography, geological structure, meteorological and hydrological and so on, and the major geological diseases,combined with the signs of the landslide deformation and failure,deeply researching on the stability factors, the main geological problems and failure modes of high fill slope,on this basis, we conclude the formation mechanism of the landslide, and correspond control measures.The results of study show that NO.12 landside is a large one on the Panzhihua airport. It takes place in the fill and lead to the resurrection of Yijiaping old landside in the lower part of its. The formation of NO.12 landside is closely related to geotechnical characteristics itself and slope structure, so slope topography and base cover interface are internal factors that influence slope stability, and seismic activity long-term adverse effects of groundwater and storm-induced are main ones that result in the formation of landside. High slope is under the control of damage of deformation, caused by soft rock. Slope is steady in the natural state, but unstable in heavy rain conditions. If the fill's resistance force is less than sliding down, piles and keys for resisting sliding will be cut and slope will be unstable. The fill's decline will lead the one hand to deformation and shape of the ones in the post-edge, and on the other hand to promote the Yijiaping old landslide below itself to revive. Ultimately the overall damage caused by slope lead to the formation of NO.12 landslide.Through the landslide formation mechanism's research, it obtains that the forming process of the landslide mainly divide into three stages: first, The filling high slope body generates creeping along the base cover interface; second, The filling high slope body creeps and cuts the anti-slippery structures one by one; third, the slope creeps as a whole, and the landslide forms. Meanwhile, through analyzing the development and changes trend of the monitoring data, we conclude NO.12 landslide of the Panzhihua Airport is a large push-move translational sliding of'creep–sliding and fracturing'type. For diseases of high slope deformation, this thesis presents the corresponding control measures.The choice of this thesis has the characteristics of combining the theory and practice, and its results provide strong guidance to the post-treatment project and reference meaning to the similar slope engineering.