基于滑坡稳定性的锚索微型桩组合抗滑结构分析
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摘要
为了给锚索微型桩组合抗滑结构的设计提供技术支持,对其开展理论研究非常必要.讨论了组合抗滑结构的工作机理,建立了锚索-微型桩-岩土体协同工作的计算模型,采用有限元法进行了求解.基于MATLAB平台开发了面向对象的分析软件,通过微型桩试验验证了分析方法和计算程序的有效性.最后结合算例,采用提出的计算方法对无锚索和不同直径锚索的微型桩抗滑结构进行了分析,并与数值模拟进行了对比,两者吻合较好.结果表明:锚索微型桩结构具有良好的承载性能,桩体弯矩、剪力和水平位移分布趋势相似,其值均为后桩最大、前桩最小,而轴力为后桩最大、中桩最小;随着锚索直径增大,锚拉力增大,边坡水平位移明显减小;滑坡推力作用下组合结构发生压弯变形,设计时前桩和中桩按拉弯验算,而后桩按压弯.提出的计算方法可为抗滑结构的设计提供理论依据.
In order to provide technical support for the design of anchor-micro-pile anti-slide structure,it is of great significance to study its calculation theory.The working mechanism of the anti-slide structure is discussed.The calculation model of the structure under the cooperative work of anchor,micro-pile and soil is established,and it is solved by finite element method.Furthermore,the analysis software for the object-oriented is developed based on MATLAB,and the analysis method and program are verified by the micro-pile model test.In the end,the micro-pile anti-slide structures without anchor and with different diameter of anchor are analyzed through an example.By comparing the calculation and the numerical simulation results,it is known that the two agrees well.The results show that there is a good bearing capacity for the anchor-micro-pile structure.The distributions of the moment,shear force and horizontal displacement in the pile are similar,these values in the rear pile are the maximum while they are minimum in the front pile.The axial force in the rear pile are the maximum while it is the minimum in the middle pile.The force of anchor increases but the horizontal displacement of slope decreases obviously with the increase of anchor diameter.There occurs compression deformation for the combined structure under the action of landslide thrust,which means the front pile and the middle pile should be designed according to stretch bending,while the rear pile should be designed by compression bending.The calculation method proposed in the paper can provide a theoretical basis for the design of anti-slide structure.
In order to provide technical support for the design of anchor-micro-pile anti-slide structure,it is of great significance to study its calculation theory.The working mechanism of the anti-slide structure is discussed.The calculation model of the structure under the cooperative work of anchor,micro-pile and soil is established,and it is solved by finite element method.Furthermore,the analysis software for the object-oriented is developed based on MATLAB,and the analysis method and program are verified by the micro-pile model test.In the end,the micro-pile anti-slide structures without anchor and with different diameter of anchor are analyzed through an example.By comparing the calculation and the numerical simulation results,it is known that the two agrees well.The results show that there is a good bearing capacity for the anchor-micro-pile structure.The distributions of the moment,shear force and horizontal displacement in the pile are similar,these values in the rear pile are the maximum while they are minimum in the front pile.The axial force in the rear pile are the maximum while it is the minimum in the middle pile.The force of anchor increases but the horizontal displacement of slope decreases obviously with the increase of anchor diameter.There occurs compression deformation for the combined structure under the action of landslide thrust,which means the front pile and the middle pile should be designed according to stretch bending,while the rear pile should be designed by compression bending.The calculation method proposed in the paper can provide a theoretical basis for the design of anti-slide structure.
引文
[1] 王恭先.滑坡防治工程措施的国内外现状[J].中国地质灾害与防治学报,1998,9(1):1-9 Wang Gongxian.Present situation of engineering measures for preventing and controlling landslide in china and abroad[J].The Chinese Journal of Geological Hazard and Control,1998,9(1):1-9
[2] 王广月,王云.土工格室生态边坡稳定性数值模拟分析[J].应用基础与工程科学学报,2016,24(5):924-933 Wang Guangyue,Wang Yun.Finite element analysis on the stability of ecological geocells reinforced slopes[J].Journal of Basic Science and Engineering,2016,24(5):924-933
[3] Armour T,Groneck P,Keeley J,et al.Micropile design and construction guidelines implementation manual[R].Washington,D.C.:U.S.Department of Transportation,Federal Highway Administration,2000
[4] 高伟.微型桩预应力锚杆复合土钉作用机制研究[D].郑州:郑州大学,2012 Gao Wei.Study of action mechanism of micropile and anchor composite soil nailing structure[D].Zhengzhou:Zhengzhou University,2012
[5] 苏晓蓓.锚索框架梁与微型桩技术在滑坡治理中的应用研究[D].西安:西安建筑科技大学,2010 Su Xiaopei.Studies on the anchor frame beam and the micropoile in landslide treatment in its application[D].Xi an:Xi'an University of Architecture and Technology,2010
[6] 吴立坚,谭冬生,洪政.微型桩-锚索系统加固边坡影响因素分析[J].铁道工程学报,2014,(6):24-29 Wu Lijian,Tan Dongsheng,Hong Zheng.Analysis of influencing factors on stability of micropile-cable system reinforced slope[J].Journal of Railway Engineering Society,2014,(6):24-29
[7] 周德培,王唤龙,孙宏伟.微型桩组合抗滑结构及其设计理论[J].岩石力学与工程学报,2009,28(7):1353-1362 Zhou Depei,Wang Huanlong,Sun Hongwei.Micropile composite structure and its design theory[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(7):1353-1362
[8] 冯君,周德培,江南,等.微型桩体系加固顺层岩质边坡的内力计算模式[J].岩石力学与工程学报,2006,25(2):284-288 Feng Jun,Zhou Depei,Jiang Nan,et al.A model for calculation of internal force of micropile system to reinforce bedding rock slope[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(2):284-288
[9] Mokwa,Dunean.Laterally loaded pile group effects and p-y multipliers[J].ASCE Journal of Geotechnical Special Publication,2001,113:728-742
[10] 孙书伟,朱本珍,郑静.基于极限抗力分析的微型桩群加固土质边坡设计方法[J].岩土工程学报,2010,32(11):1671-1677 Sun Shuwei,Zhu Benzhen,Zheng Jing.Design method of micropile group for soil slope stabilization based on ultimate resistance of analysis[J].Chinese Journal of Geotechnical Engineering,2010,32(11):1671-1677
[11] 肖世国,鲜飞,王唤龙.一种微型桩组合抗滑结构内力分析方法[J].岩土力学,2010,31(8):2553-2564 Xiao Shiguo,Xian Fei,Wang Huanlong.Analytical method of internal forces of a combining micropiles structure[J].Rock and Soil Mechanics,2010,31(8):2553-2564
[12] 胡天飞,杜升涛,梁龙龙.微型桩-锚索组合抗滑新结构支挡效果的数值分析[J].防灾减灾工程学报,2015,35(2):212-218 Hu Tianfei,Du Shengtao,Liang Longlong.Numerical analysis of retaining effect supported by new micropile-anchor composite anti-sliding structure[J].Journal of Disaster Prevention and Mitigation Engineering,2015,35(2):212-218
[13] 魏焕卫,宋丰波,杨敏,等.复合土钉墙变形的简化计算方法[J].工程力学,2011,28(增1):156-161 Wei Huanwei,Song Fengbo,Yang Min,et al.Calculation model of soil pressure displacement based on mind-ling solution[J].Engineering mechanics,2011,28(S1):156-161
[14] 孙书伟,陈冲,丁辉,等.微型桩群加固土坡稳定性分析[J].岩土工程学报,2014,36(12):2306-2314 Sun Shuwei,Chen Chong,Ding Hui,et al.Stability analysis of earth slopes reinforced with micropile[J].Chinese Journal of Geotechnical Engineering,2014,36(12):2306-2314
[15] 孙书伟,朱本珍,马惠民,等.微型桩群与普通抗滑桩抗滑特性的对比试验研究[J].岩土工程学报,2009,31(10):1564-1570 Sun Shuwei,Zhu Benzhen,Ma Huimin,et al.Model tests on anti-sliding mechanism of micropile groups and anti-sliding piles[J].Chinese Journal of Geotechnical Engineering,2009,31(10):1564-1570
[16] 陈丽波.基坑工程中锚索微型桩支护结构设计方法探讨[J].铁道建筑,2016,(8):116-120 Chen Libo.Discussion on design method of supporting structure of anchor cable combined with micro-pile used foundation pit[J].Railway Engineering,2016,(8):116-120
[17] Bruce D A,Cadden A W,Sabatini P J.Practical advice for foundation design-micropiles for structural support[C].GSP 131 Contemporary Issues in Foundation Engineering.ASCE,2005:1-25
[18] 张友良,冯夏庭,范建海,等.抗滑桩与滑坡体相互作用的研究[J].岩石力学与工程学报,2002,21(6):839-842 Zhang Youliang,Feng Xiating,Fan Jianhai,et al.Study on the interaction between landslide and passive piles[J].Chinese Journal of Rock Mechanics and Engineering,2002,21(6):839-842
[19] 杨雪强,刘祖德,何世秀.深基坑支护的杆系有限元分析[J].湖北工学院学报,2000,15(2):17-20 Yang Xueqiang,Liu Zude,He Shixiu.Pole system FEM analysis of deep pit supporting[J].Journal of Hubei Polytechnic University,2000,15(2):17-20
[2] 王广月,王云.土工格室生态边坡稳定性数值模拟分析[J].应用基础与工程科学学报,2016,24(5):924-933 Wang Guangyue,Wang Yun.Finite element analysis on the stability of ecological geocells reinforced slopes[J].Journal of Basic Science and Engineering,2016,24(5):924-933
[3] Armour T,Groneck P,Keeley J,et al.Micropile design and construction guidelines implementation manual[R].Washington,D.C.:U.S.Department of Transportation,Federal Highway Administration,2000
[4] 高伟.微型桩预应力锚杆复合土钉作用机制研究[D].郑州:郑州大学,2012 Gao Wei.Study of action mechanism of micropile and anchor composite soil nailing structure[D].Zhengzhou:Zhengzhou University,2012
[5] 苏晓蓓.锚索框架梁与微型桩技术在滑坡治理中的应用研究[D].西安:西安建筑科技大学,2010 Su Xiaopei.Studies on the anchor frame beam and the micropoile in landslide treatment in its application[D].Xi an:Xi'an University of Architecture and Technology,2010
[6] 吴立坚,谭冬生,洪政.微型桩-锚索系统加固边坡影响因素分析[J].铁道工程学报,2014,(6):24-29 Wu Lijian,Tan Dongsheng,Hong Zheng.Analysis of influencing factors on stability of micropile-cable system reinforced slope[J].Journal of Railway Engineering Society,2014,(6):24-29
[7] 周德培,王唤龙,孙宏伟.微型桩组合抗滑结构及其设计理论[J].岩石力学与工程学报,2009,28(7):1353-1362 Zhou Depei,Wang Huanlong,Sun Hongwei.Micropile composite structure and its design theory[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(7):1353-1362
[8] 冯君,周德培,江南,等.微型桩体系加固顺层岩质边坡的内力计算模式[J].岩石力学与工程学报,2006,25(2):284-288 Feng Jun,Zhou Depei,Jiang Nan,et al.A model for calculation of internal force of micropile system to reinforce bedding rock slope[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(2):284-288
[9] Mokwa,Dunean.Laterally loaded pile group effects and p-y multipliers[J].ASCE Journal of Geotechnical Special Publication,2001,113:728-742
[10] 孙书伟,朱本珍,郑静.基于极限抗力分析的微型桩群加固土质边坡设计方法[J].岩土工程学报,2010,32(11):1671-1677 Sun Shuwei,Zhu Benzhen,Zheng Jing.Design method of micropile group for soil slope stabilization based on ultimate resistance of analysis[J].Chinese Journal of Geotechnical Engineering,2010,32(11):1671-1677
[11] 肖世国,鲜飞,王唤龙.一种微型桩组合抗滑结构内力分析方法[J].岩土力学,2010,31(8):2553-2564 Xiao Shiguo,Xian Fei,Wang Huanlong.Analytical method of internal forces of a combining micropiles structure[J].Rock and Soil Mechanics,2010,31(8):2553-2564
[12] 胡天飞,杜升涛,梁龙龙.微型桩-锚索组合抗滑新结构支挡效果的数值分析[J].防灾减灾工程学报,2015,35(2):212-218 Hu Tianfei,Du Shengtao,Liang Longlong.Numerical analysis of retaining effect supported by new micropile-anchor composite anti-sliding structure[J].Journal of Disaster Prevention and Mitigation Engineering,2015,35(2):212-218
[13] 魏焕卫,宋丰波,杨敏,等.复合土钉墙变形的简化计算方法[J].工程力学,2011,28(增1):156-161 Wei Huanwei,Song Fengbo,Yang Min,et al.Calculation model of soil pressure displacement based on mind-ling solution[J].Engineering mechanics,2011,28(S1):156-161
[14] 孙书伟,陈冲,丁辉,等.微型桩群加固土坡稳定性分析[J].岩土工程学报,2014,36(12):2306-2314 Sun Shuwei,Chen Chong,Ding Hui,et al.Stability analysis of earth slopes reinforced with micropile[J].Chinese Journal of Geotechnical Engineering,2014,36(12):2306-2314
[15] 孙书伟,朱本珍,马惠民,等.微型桩群与普通抗滑桩抗滑特性的对比试验研究[J].岩土工程学报,2009,31(10):1564-1570 Sun Shuwei,Zhu Benzhen,Ma Huimin,et al.Model tests on anti-sliding mechanism of micropile groups and anti-sliding piles[J].Chinese Journal of Geotechnical Engineering,2009,31(10):1564-1570
[16] 陈丽波.基坑工程中锚索微型桩支护结构设计方法探讨[J].铁道建筑,2016,(8):116-120 Chen Libo.Discussion on design method of supporting structure of anchor cable combined with micro-pile used foundation pit[J].Railway Engineering,2016,(8):116-120
[17] Bruce D A,Cadden A W,Sabatini P J.Practical advice for foundation design-micropiles for structural support[C].GSP 131 Contemporary Issues in Foundation Engineering.ASCE,2005:1-25
[18] 张友良,冯夏庭,范建海,等.抗滑桩与滑坡体相互作用的研究[J].岩石力学与工程学报,2002,21(6):839-842 Zhang Youliang,Feng Xiating,Fan Jianhai,et al.Study on the interaction between landslide and passive piles[J].Chinese Journal of Rock Mechanics and Engineering,2002,21(6):839-842
[19] 杨雪强,刘祖德,何世秀.深基坑支护的杆系有限元分析[J].湖北工学院学报,2000,15(2):17-20 Yang Xueqiang,Liu Zude,He Shixiu.Pole system FEM analysis of deep pit supporting[J].Journal of Hubei Polytechnic University,2000,15(2):17-20