(1. China Northwest Research Institute Co.，Ltd.，Lanzhou，Gansu 730070；2. China Railway Landslide Engineering Laboratory，Lanzhou，Gansu 730070；3. Western Environmental Geotechnical and Site Rehabilitation Technology Engineering Laboratory，Lanzhou，Gansu 730070；4. School of Civil Engineering，Lanzhou Jiaotong University，Lanzhou，Gansu 730070；
5. PowerChina Huadong Engineering Corporation Limited，Hangzhou，Zhejiang 311122)
Abstract：The problem of deformation and instability of high-filled slopes in mountainous airports is a hotspot and a difficult point in airport research. Especially，the cooperative deformation mechanism of the combined support structure of slopes is one of the unsolved problems. In this paper，taking the #12 high fill of Panzhihua Airport as an example，3D visualization analysis was carried out based on the original design of the anchor cable-anti-slide pile-reinforced soil retaining wall treatment plan and by using BIM technology to design the model. Finite element simulation and experimental test were performed to analyze the influence of the cushion layer at the top of the pile on cooperative plastic deformation of the filling soil and the compound support system. Research results show that integrating the basic geotechnical parameters and information generalization of the survey data into the BIM model not only realizes the geological exploration most likely to be close to the actual site to ensure the scientificity and accuracy of the stratum parameters but also effectively solves the calculation of the arbitrary section cut design，and that space collision detection under complex conditions can be conducted effectively. It is pointed out that the development of BIM and finite element software interface program and the optimization of landslide engineering survey and design software for finite element calculation will become a new category to be improved. The mismatch between the rear anti-slide pile stiffness and the filling stiffness results in a plastic shear band inside the filling soil extending from the top of the pile to the slope in the case of high filling，which leads to settlement difference and stability problem of the filling soil. The cushion optimization design can well solve the problem of deformation non-coordination and provide an effective reference for similar engineering management. The influence of the cushion on the support system is mainly reflected in the performance of the anti-slide pile. Due to that the front pile is more sensitive to the overall response of the cushion，it is suggested to additionally set cushions to strengthen the shear force design of the rear pile. With increasing the fill height，the reinforced soil shows the external stability problem while the non-reinforced soil shows the settlement problem. The existence of the rear pile enlarges the possibility of external deformation of the slope due to the mismatch of the stiffness.
吴红刚1，2，3，牌立芳1，2，4，赖天文4，张俊德1，章延平5，李玉瑞3，4. 山区机场高填方边坡桩–锚–加筋土组合结构协同工作性能优化研究[J]. 岩石力学与工程学报, 2019, 38(7): 1498-1511.
WU Honggang1，2，3，PAI Lifang1，2，4，LAI Tianwen4，ZHANG Junde1，ZHANG Yanping5，LI Yurui3，4. Study on cooperative performance of pile-anchor-reinforced soil combined retaining structure of high fill slopes in mountainous airports. , 2019, 38(7): 1498-1511.
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2019, Vol. 38 
