高陡黄土边坡多级有限填土加筋土-框锚组合体系抗滑分析
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摘要
针对黄土滑塌高边坡治理加固中的空间受限、高填方填筑及水平位移变形等问题,提出了多级有限填土加筋土-框锚组合体系;目前对其抗滑稳定分析鲜有研究。依托陕西铜川某高陡边坡为背景,通过利用有限元数值计算和现场监测、测试,分析了该组合体系抗滑作用效果。结果表明:随着支护结构的逐步施加对边坡位移控制明显,锚索轴力变化具有一定的规律性。锚索自由段轴力最大,锚固段轴力变化曲线呈下凹型,向尾部方向逐渐变小,端部接近零;锚索应力对坡体内部变形敏感程度较高,锚索对坡体位移控制起到关键作用。有限加筋土-框锚组合体系协同作用下,框架锚索提供抗滑力约占总抗滑力的62. 73%,有限加筋土挡墙提供抗滑力约占总抗滑力的37. 27%,框架锚索与有限加筋土分担下滑力比值为1. 68∶1。有限填土加筋土与框架锚索组合柔性支挡结构可以有效治理黄土滑塌高边坡病害,实现了预期的抗滑设计效果。研究结果为中国范围内同类高陡边坡治理提供有益的参考,为拓展边坡与地质灾害治理方式和理论提供基础依据。
Aiming at the problem of high backfill filling and horizontal deformation in the treatment and reinforcement of loess sliding high slope,a composite system of reinforced soil with limited backfill and anchor frame beam is proposed. At present,the anti-slide stability analysis is rarely studied. Based on a high-steep slope in Tongchuan,Shaanxi Province,the anti-slide effect of the combined system was analyzed in the treatment of loess slump high slope by using finite element numerical calculation and on-site monitoring and testing,The results show that with the gradual application of the supporting structure,the displacement control of the slope is obvious,and the axial force change of the anchor cable has certain regularity. The axial force of the free section of the anchor cable is the largest,and the axial force variation curve of the anchorage section is concave,gradually becoming smaller toward the tail,and the end is close to zero. The anchor cable stress is sensitive to the internal deformation of the slope,and the displacement control of the anchor cable to the slope play a key role. Under the synergistic action of reinforced soil with limited backfill and anchor frame beam composite system,The frame-anchor cable provides antisliding force of about 62. 73% of the total anti-sliding force,and the limited reinforced earth retaining wall provides anti-sliding force of about 37. 27% of the total anti-sliding force. The ratio of anchor cable to limited reinforced soil sharing slip force is 1. 68∶ 1. The composite flexible retaining structure of reinforced soil with limited backfill retaining and frame anchor cable can effectively control the loess sliding high slope. The expected anti-slide design effect has been achieved. It provides a useful reference for the treatment of similar high-steep slope across the country,and provides a basis for expanding the management methods and theories of slope and geological disaster.
Aiming at the problem of high backfill filling and horizontal deformation in the treatment and reinforcement of loess sliding high slope,a composite system of reinforced soil with limited backfill and anchor frame beam is proposed. At present,the anti-slide stability analysis is rarely studied. Based on a high-steep slope in Tongchuan,Shaanxi Province,the anti-slide effect of the combined system was analyzed in the treatment of loess slump high slope by using finite element numerical calculation and on-site monitoring and testing,The results show that with the gradual application of the supporting structure,the displacement control of the slope is obvious,and the axial force change of the anchor cable has certain regularity. The axial force of the free section of the anchor cable is the largest,and the axial force variation curve of the anchorage section is concave,gradually becoming smaller toward the tail,and the end is close to zero. The anchor cable stress is sensitive to the internal deformation of the slope,and the displacement control of the anchor cable to the slope play a key role. Under the synergistic action of reinforced soil with limited backfill and anchor frame beam composite system,The frame-anchor cable provides antisliding force of about 62. 73% of the total anti-sliding force,and the limited reinforced earth retaining wall provides anti-sliding force of about 37. 27% of the total anti-sliding force. The ratio of anchor cable to limited reinforced soil sharing slip force is 1. 68∶ 1. The composite flexible retaining structure of reinforced soil with limited backfill retaining and frame anchor cable can effectively control the loess sliding high slope. The expected anti-slide design effect has been achieved. It provides a useful reference for the treatment of similar high-steep slope across the country,and provides a basis for expanding the management methods and theories of slope and geological disaster.
引文
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15 中华人民共和国住房和城乡建设部.建筑边坡工程技术规范[S]:GB 50330—2013.北京:中国建筑工业出版社,2013Ministry of Housing and Urban-Rural Development of the People's Republic of China. Technical code for building slope engineering[S]:GB 50330—2013. Beijing:China Architecture and Building Press,2013
16 于远祥,谷拴成,吴璋,等.黄土地层下预应力锚索荷载传递规律的试验研究[J].岩石力学与工程学报,2010,29(12):2573-2580Yu Yuanxiang,Gu Shuancheng,Wu Zhang,et al. Experimental study of load transfer law of prestressed cables under loess stratum[J]. Chinese Journal of Rock Mechanics and Engineering,2010,29(12):2573-2580
17 景锋,成传欢,余美万,等.锚索内锚段荷载分布及其随时间变化规律[J].长江科学院院报,2011,28(5):50-54Jing Feng,Cheng Chuanhuan,Yu Meiwan,et al. Load distribution and the law of its variation in the inner segment of prestressed Anchor cable[J]. Journal of Yangtze River Scientific Research Institut,2011,28(5):50-54
18 李英勇,王梦恕,张顶立,等.锚索预应力变化影响因素及模型研究[J].岩石力学与工程学报,2008,27(增刊1):3140-3146Li Yingyong,Wang Menru Zhang dingli,et al. Study on influential factors and model for variation of anchor cable prestress[J]. Chinese Journal of Rock Mechanics and Engineering,2008,27(S1):3140-3146
19 朱晗迓,孙红月,汪会帮,等.边坡加固锚索预应力变化规律分析[J].岩石力学与工程学报,2004,23(16):2756-2760Zhu Hanya,Sun Hongyue,Wang Huibang,et al. Analysis on prestress state of cable applied to rock peinforcement[J]. Chinese Journal of Rock Mechanics and Engineering,2004,23(16):2756-2760
20 杨校辉,朱彦鹏,郭楠,等.软岩深基坑预应力锚杆承载特性与滑移面确定试验研究[J].岩石力学与工程学报,2014,33(增刊2):4287-4298Yang Xiaohui,Zhu Yanpeng,Guo Nan,et al. Experimental research on bearing behavior of prestressed anchor and determination of slip surface in deep excavation of weak rock[J]. Chinese Journal of Rock Mechanics and Engineering,2014,33(S2):4287-4298
2 Yang K H,Zornberg J G,Hung W Y,et al. Location of failure plane and design considerations for narrow geosynthetic reinforced soil wall systems[J]. Journal of Geo Engineering,2011,6(1):27-40
3 Yang K H,Liu C N. Finite element analysis of earth pressures for narrow retaining wall[J]. Journal of Geoengineering. 2007,2(2):43-52
4 Yang K H,Kniss K K,Zornberg J G. et al. Finite element analyses for centrifuge modeling of narrow MSE walls[C]//The First Pan American Geosynthetics Conference&Exhibition. Cancun:Geoamericas,2008:183-192
5 徐超,罗玉珊,贾斌,等.短加筋土挡墙墙后连接作用的离心模型试验研究[J].岩土工程学报,2016,38(1):180-186Xu Chao,Luo Yushan,Jia Bin,et al. Effects of connection forms on shored mechanically stabilized earth walls by centrifugal model tests[J]. Chinese Journal of Geotechnical Engineering,2016,38(1):180-186
6 罗玉珊,徐超,陈洪帅,等.台阶式短加筋土挡墙行为特征的离心模型试验[J].西南交通大学学报,2016,51(6):1163-1169Luo Yushan,Xu Chao,Che Hongshuai,et al. Centrifuge modeling tests on behavior of tiered shored mechanically stabilized earth walls[J]. Journalof Southwest Jiaotong University,2016,51(6):1163-1169
7 徐超,梁程,罗玉珊.有限填土加筋土挡墙的稳定性及破坏模式分析[J].水文地质工程地质,2017,44(1):104-109Xu Chao,Liang Cheng,Luo Yushan. Stability and failure modes of geosynthetic reinforced siol wall with limited retained backfill[J]. Hyderogeolocy&Engineering Geology,2017,44(1):104-109
8 周勇,王旭日,朱彦鹏,等.泥岩砂岩互层高边坡监测与数值模拟对比分析[J].兰州理工大学学报,2018,44(1):109-115Zhou Yong,Wang Xuri,Zhu Yanpeng,et al. Contrastive analysis of monitoring and numerical simulation of high slope with interbed of mudstone and sandstone[J]. Journal of Lanzhou University of Technology,2018,44(1):109-115
9 周勇,朱彦鹏.预应力锚杆柔性支护体系的锚杆抗拔力研究[J].岩土力学,2012,33(2):415-421Zhou Yong,Zhu Yanpeng. Research on anti-pulling force of anchor of flexible supporting system with prestressed anchors[J]. Rock and Soil Mechanics,2012,33(2):415-421
10 周勇,王旭日,朱彦鹏,等.强风化软硬互层岩质高边坡监测与数值模拟[J].岩土力学,2018,39(6):2250-2258Zhou Yong,Wang Xuri,Zhu Yanpeng,et al. Monitoring and numerical simulation of an interbedding high slope composed of soft and hard strong-weathered rock[J]. Rock and Soil Mechanics,2018,39(6):2250-2258
11 胡晋川,谢永利,王文生.黄土公路阶梯状高路堑边坡稳定性研究[J].岩石力学与工程学报,2010,29(增刊1):3093-3100Hu Jinchuan,Xie Yongli,Wang Wensheng. Study of stability characteristics of multi-stair high cut slope in loess highway[J]. Chinese Journal of Rock Mechanics and Engineering,2010,29(S1):3093-3100
12 叶万军,折学森.阶梯状黄土高路堑高边坡稳定性分析方法[J].水文地质工程地质,2005,32(6):75-78Ye Wanjun,She Xuesen. Stability nalysis of step-shaped cutting high loesss lopes[J]. Hydrogeology&Engineering,2005,32(6):75-78
13 王念秦,罗东海,姚勇.铁路黄土高边坡变形破坏机理及稳定性研究[J].铁道工程学报,2009,26(7):10-14Wang Nianqin,Luo Donghai,Yao Yong. Research on the deformation failure mechanism and stability of high loess slopealong railway[J]. Journal of Railway Engineering Society,2009,26(7):10-14
14 叶万军,刘忠祥,董西好.基于能量判据的某黄土高边坡优化设计[J].科学技术与工程,2017,17(20):213-218Ye Wanjun,Liu Zhongxiang,Dong Xihao. Optimization design of high loess slope based on energy criterion[J]. Science Technology and Engineering,2017,17(20):213-218
15 中华人民共和国住房和城乡建设部.建筑边坡工程技术规范[S]:GB 50330—2013.北京:中国建筑工业出版社,2013Ministry of Housing and Urban-Rural Development of the People's Republic of China. Technical code for building slope engineering[S]:GB 50330—2013. Beijing:China Architecture and Building Press,2013
16 于远祥,谷拴成,吴璋,等.黄土地层下预应力锚索荷载传递规律的试验研究[J].岩石力学与工程学报,2010,29(12):2573-2580Yu Yuanxiang,Gu Shuancheng,Wu Zhang,et al. Experimental study of load transfer law of prestressed cables under loess stratum[J]. Chinese Journal of Rock Mechanics and Engineering,2010,29(12):2573-2580
17 景锋,成传欢,余美万,等.锚索内锚段荷载分布及其随时间变化规律[J].长江科学院院报,2011,28(5):50-54Jing Feng,Cheng Chuanhuan,Yu Meiwan,et al. Load distribution and the law of its variation in the inner segment of prestressed Anchor cable[J]. Journal of Yangtze River Scientific Research Institut,2011,28(5):50-54
18 李英勇,王梦恕,张顶立,等.锚索预应力变化影响因素及模型研究[J].岩石力学与工程学报,2008,27(增刊1):3140-3146Li Yingyong,Wang Menru Zhang dingli,et al. Study on influential factors and model for variation of anchor cable prestress[J]. Chinese Journal of Rock Mechanics and Engineering,2008,27(S1):3140-3146
19 朱晗迓,孙红月,汪会帮,等.边坡加固锚索预应力变化规律分析[J].岩石力学与工程学报,2004,23(16):2756-2760Zhu Hanya,Sun Hongyue,Wang Huibang,et al. Analysis on prestress state of cable applied to rock peinforcement[J]. Chinese Journal of Rock Mechanics and Engineering,2004,23(16):2756-2760
20 杨校辉,朱彦鹏,郭楠,等.软岩深基坑预应力锚杆承载特性与滑移面确定试验研究[J].岩石力学与工程学报,2014,33(增刊2):4287-4298Yang Xiaohui,Zhu Yanpeng,Guo Nan,et al. Experimental research on bearing behavior of prestressed anchor and determination of slip surface in deep excavation of weak rock[J]. Chinese Journal of Rock Mechanics and Engineering,2014,33(S2):4287-4298
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