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

doi:10.13722/j.cnki.jrme.2018.1077

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摘要山区机场高填方边坡的变形失稳是目前机场研究的热点和难点，特别是边坡治理联合支挡结构的协同变形工作机能是当下尚未解决的难题之一。以攀枝花机场12#高填方为例，基于原设计锚索–抗滑桩–加筋土挡墙治理方案，运用BIM技术进行模型设计，达成三维可视化分析。以后排桩顶部增设垫层优化为研究对象，结合有限元计算，开展试验研究，对比分析垫层对控制填土内部塑性协同变形发展及综合支护体系的影响。研究表明：(1) 将勘察数据等场地基本岩土工程参数和信息概化整合进BIM模型，不仅实现地质勘查最可能的接近现场实际，确保地层参数的科学性和准确性，而且有效解决了任意断面剖切设计计算的困扰，达成了复杂条件下空间碰撞检测的效果。(2) 因后排抗滑桩与填土刚度不匹配，导致高填方情况下在填土内部形成从桩顶延伸至坡面的塑性剪切带，影响填土内部的稳定性、出现沉降差异，而垫层优化设计很好地解决了变形不协同的难题。(3) 垫层对体系的影响主要体现在抗滑桩的性能发挥上，前排桩对垫层的整体响应更加敏感，设计宜鼓励增设垫层，强化后排桩剪力设计。(4) 随着填土填筑高度的增加，加筋土部分表现外部稳定性问题，非加筋土表现为沉降问题，后排桩的存在加剧了坡体的外部变形可能性，刚度不匹配问题成为焦点。

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	吴红刚1
	2
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	牌立芳1
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	赖天文4
	张俊德1
	章延平5
	李玉瑞3
	4

关键词 ：边坡工程, 高填方边坡, 桩&ndash, 锚&ndash, 加筋土综合治理, 协同变形, 垫层优化, BIM技术, 模型试验

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.

Key words： slope engineering high fill slope pile-anchored-reinforced soil comprehensive treatment cooperative deformation cushion optimization BIM technology model test

引用本文:

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.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.1077 或 http://www.rockmech.org/CN/Y2019/V38/I7/1498

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