基于树根桩加固的震后公路路基边坡综合修复技术
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摘要
为实现震后路基边坡的快速修复,提出基于树根桩加固的震后公路路基边坡综合修复技术。根据路基震害及地质环境对路基边坡的影响分析因素,采用树根桩技术及气泡轻质填土技术修复路基边坡;利用三维有限差分法模拟树桩加固气泡轻质填土修复后路基边坡得到参数值,再结合强度折减法计算得到的路基边坡稳定系数,最后得到优化树根桩的设计参数,以实现震后路基边坡综合修复。以上方法通过仿真模拟实验,得到最优的树根桩排距为2.5 dm。
A comprehensive technology for accelerating the post-earthquake restoration of subgrade road slopes is proposed. The technology is based on root-pile reinforcement and foamed lightweight soil technology, and restoration is performed in accordance with subgrade earthquake damage and the influence analysis results of the geological environment of the subgrade slope. The three-dimensional finite-difference method is used to simulate the restored subgrade slope and to obtain parameters. Then, the design parameters of the optimized root piles are acquired by combining the stability coefficients of the subgrade slope calculated through the strength reduction method. Finally, the post-earthquake subgrade is comprehensively restored. Simulation experiments reveal that the optimal root-pile spacing is 25 cm.
A comprehensive technology for accelerating the post-earthquake restoration of subgrade road slopes is proposed. The technology is based on root-pile reinforcement and foamed lightweight soil technology, and restoration is performed in accordance with subgrade earthquake damage and the influence analysis results of the geological environment of the subgrade slope. The three-dimensional finite-difference method is used to simulate the restored subgrade slope and to obtain parameters. Then, the design parameters of the optimized root piles are acquired by combining the stability coefficients of the subgrade slope calculated through the strength reduction method. Finally, the post-earthquake subgrade is comprehensively restored. Simulation experiments reveal that the optimal root-pile spacing is 25 cm.
引文
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[15] 王昊,杜晓燕,叶阳升,等.异型纤维土六棱砖骨架护坡技术研究[J].铁道建筑,2017,57(9):100-103.WANG Hao,DUXiaoyan,YE Yangsheng,et al.Research on Slope Protection Technique Using Hexagonal Brick Skeleton Filled with Heterotype Fiber Soil[J].Railway Engineering,2017,57(9):100-103.
[2] 赵冰琴,夏振尧,许文年,等.工程扰动区边坡生态修复技术研究综述[J].水利水电技术,2017,48(2):130-137.ZHAO Bingqin,XIA Zhenyao,XU Wennian,et al.Review on Research of Slope Eco-restoration Technique for Engineering Disturbed Area[J].Water Resources and Hydropower Engineering,2017,48(2):130-137.
[3] 牛家永,江学良,杨慧,等.含小净距隧道岩石边坡地震动力响应特性研究[J].自然灾害学报,2017,26(5):130-139.NIU Jiayong,JIANG Xueliang,YANG Hui,et al.Study on Dynamic Response Characteristics of Rock Slope with Small Spacing Tunnel under Earthquakes[J].Journal of Natural Disasters,2017,26(5):130-139.
[4] 张敏霞,徐平,高帅,等.采动地表土体沉陷对桥梁桩基影响试验研究[J].岩石力学与工程学报,2017,36(增刊2):4122-4133.ZHANG Minxia,XU Ping,GAO Shuai,et al.Experimental Study on Mining-induced Surface Subsidence Influence on the Pile Foundation of Bridge[J].Chinese Journal of Rock Mechanics and Engineering,2017,36(Supp2):4122-4133.
[5] 丁浩,赖金星,刘厚全,等.黄土隧道基底树根桩加固效果的数值分析[J].筑路机械与施工机械化,2018,35(1):116-120.DING Hao,LAI Jinxing,LIU Houquan,et al.Numerical Analysis of Reinforcement Effect of Root Pile in Loess Tunnel[J].Road Machinery & Construction Mechanization,2018,35(1):116-120
[6] 王凯,葛翠翠,李柏殿,等.公路桥梁伸缩缝过渡区混凝土修复技术研究[J].硅酸盐通报,2017,36(8):2838-2843.WANG Kai,GE Cuicui,LI Bodian,et al.Repair Technology for Concrete in Highway Bridge Expansion Joint Transition Zone[J].Bulletin of the Chinese Ceramic Society,2017,36(8):2838-2843.
[7] 郝冠军,田波,侯荣国.微裂技术在基层快速修复中的应用[J].公路交通科技,2016,33(8):51-57.HAO Guanjun,TIAN Bo,HOU Rongguo.Application of Micro-Cracking Technique in Base Quick Repair[J].Journal of Highway and Transportation Research and Development,2016,33(8):51-57.
[8] 张东亮,黄达.落石冲击旁山填方路基边坡破坏数值模拟[J].地下空间与工程学报,2017,13(增刊1):135-142.ZHANG Dongliang,HUANG Da.Numerical Modeling of Failure of Fill Roadbed Slope beside Hillslope Induced by Rock-Fall Impact[J].Chinese Journal of Underground Space and Engineering,2017,13(Supp1):135-142.
[9] 刘文月,张林洪,彭邵勇,等.金安桥电站库区边坡路基变形研究[J].水力发电学报,2016,35(4):89-97.LIU Wenyue,ZHANG Linhong,PENG Shaoyong,et al.Roadbed Deformation on Reservoir Bank for Jin'anqiao Hydropower Station[J].Journal of Hydroelectric Engineering,2016,35(4):89-97.
[10] 介玉新,李伟瀚,张彬.用加速度方法分析隧洞的稳定性[J].河海大学学报(自然科学版),2018,46(4):301-306.JIE Yuxin,LI Weihan,ZHANG Bin.Stability Analysis of Tunnel Using the Acceleration Method[J].Journal of Hohai University (Natural Sciences),2018,46(4):301-306.
[11] 秦凤艳,杨富莲,刘洪波,等.常见边坡支护形式的地震稳定性对比分析[J].地震工程学报,2017,39(3):460-466.QIN Fengyan,YANG Fulian,LIU Hongbo,et al.Comparative Analysis of Seismic Stability on a CommonSlope Support Form[J].China Earthquake Engineering Journal,2017,39(3):460-466.
[12] 李杰,代跃,陈淮.随机地震动场多点激励下宽幅大跨桥梁结构地震响应研究[J].地震工程学报,2017,39(1):39-44.LI Jie,DAI Yue,CHEN Huai.Seismic Response of Wide-span Bridge Structures under Multi-point Excitation of Random Ground Motion Field[J].China Earthquake Engineering Journal,2017,39(1):39-44.
[13] 贾鹏,王兰民,万征,等.某桥梁桩基础的抗震计算研究[J].地震工程学报,2018,40(2):258-264.JIA Peng,WANG Lanmin,WAN Zheng,et al.Seismic Calculation and Analysis of the Pile Foundation of a Certain Bridge[J].Northwestern Seismological Journal,2018,40(2):258-264.
[14] 闫超,刘松玉,籍晓蕾.一种基于强度折减法的次级滑动面分析方法研究[J].岩土力学,2016,37(4):935-942.YAN Chao,LIU Songyu,JI Xiaolei.Research on a Secondary Sliding Surface Analysis Approach Based on Strength Reduction Method[J].Rock and Soil Mechanics,2016,37(4):935-942.
[15] 王昊,杜晓燕,叶阳升,等.异型纤维土六棱砖骨架护坡技术研究[J].铁道建筑,2017,57(9):100-103.WANG Hao,DUXiaoyan,YE Yangsheng,et al.Research on Slope Protection Technique Using Hexagonal Brick Skeleton Filled with Heterotype Fiber Soil[J].Railway Engineering,2017,57(9):100-103.