抗滑桩不同布桩方式加固效果对比模型试验研究
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摘要
为研究不同布桩方式抗滑桩加固效果,设计了一套基于三维激光扫描等多种非接触测量方法的滑坡模型试验系统.试验系统通过减速电机的慢速牵拉诱发滑坡,解决了传统模型试验技术诱发滑坡时难以捕捉滑坡启动点的难题,并利用三维激光扫描、DIC测量等多种非接触测试手段获取了滑坡演化过程中位移、应力、破裂扩展等多物理场数据,实现了对滑坡演化全过程的模拟.对滑坡未加固状态、抗滑桩直线布桩和拱型布桩3种状态下加固效果进行了一系列模型试验研究.试验结果表明,在未加固状态下,坡体最大抗滑力为95N,抗滑桩直线布桩和拱型布桩状态下,坡体最大抗滑力分别为140N和180N.直线布桩和拱型布桩的最大抗滑力分别提高了47%和89%.拱型布桩滑坡体后缘拉裂缝规模更小,坡体下滑距离更短,土拱影响区域更大,能更好地发挥桩侧摩阻力,提高坡体抗滑能力.结合试验数据,提出了抗滑桩拱型布桩条件下的最大桩间距计算公式.
In order to study the reinforcement effect of anti-sliding piles with different arrangements,a set of landslide model test system was designed based on three-dimensional laser scanning and other non-contact measurement methods.The test system induces landslides through the slow traction of the geared motor,which solves the difficulty of capturing the landslide starting point when landslides are induced by traditional model test technique.Multiple physical field data such as displacement,stress,and fracture propagation morphology in the process of landslide evolution were obtained by using multiple non-contact test methods such as three-dimensional laser scanning and digital image correlation(DIC) measurement method,so the entire process simulation of the landslide evolution is achieved.A series of model tests were conducted on reinforcement effects of landslide with different pile arrangements including unreinforced,linear and arch.The test results show that the maximum anti-sliding forces of the three different pile arrangements including unreinforced,linear and arch are 95 N,140 N and 180 N,respectively.The maximum anti-sliding forces of the line and arched arrangements increased by 47% and 89% compared with the unreinforced state,respectively.Compared with the other two kinds of pile arrangements,the scale of tensile crack at the trailing edge of the landslide with arch pile arrangements is smaller,the movement distance of the slope body is shorter,and the affected area of the soil arch is greater,so which can better play the role of side friction resistance and improve the slope anti-sliding ability.Combined with the test data,a calculation formula was proposed for predicting the maximum pile spacing of anti-slide pile with arch pile arrangement.
In order to study the reinforcement effect of anti-sliding piles with different arrangements,a set of landslide model test system was designed based on three-dimensional laser scanning and other non-contact measurement methods.The test system induces landslides through the slow traction of the geared motor,which solves the difficulty of capturing the landslide starting point when landslides are induced by traditional model test technique.Multiple physical field data such as displacement,stress,and fracture propagation morphology in the process of landslide evolution were obtained by using multiple non-contact test methods such as three-dimensional laser scanning and digital image correlation(DIC) measurement method,so the entire process simulation of the landslide evolution is achieved.A series of model tests were conducted on reinforcement effects of landslide with different pile arrangements including unreinforced,linear and arch.The test results show that the maximum anti-sliding forces of the three different pile arrangements including unreinforced,linear and arch are 95 N,140 N and 180 N,respectively.The maximum anti-sliding forces of the line and arched arrangements increased by 47% and 89% compared with the unreinforced state,respectively.Compared with the other two kinds of pile arrangements,the scale of tensile crack at the trailing edge of the landslide with arch pile arrangements is smaller,the movement distance of the slope body is shorter,and the affected area of the soil arch is greater,so which can better play the role of side friction resistance and improve the slope anti-sliding ability.Combined with the test data,a calculation formula was proposed for predicting the maximum pile spacing of anti-slide pile with arch pile arrangement.
引文
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[8] 张常亮,李同录,李萍.三维滑坡推力计算方法探讨[J].工程地质学报,2011,19(2):162-167,283 Zhang Changliang,Li Tonglu,Li Ping.Calculation metod for driving force of three-dimensional landslides[J].Journal of Engineering Geology,2011,19(2):162-167,283
[9] Mohamed Ashour,Hamed Ardalan.Analysis of pile stabbilized slopes based on soil-pile interaction[J].Computers and Geotechnics,2015,39:85-97
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[12] 张建勋,陈福全,简洪钮.被动桩中土拱效应问题的数值分析[J].岩土力学,2004,25(2):174-179 Zhang Jianxun,Chen Fuquan,Jian Hongniu.Numerical analysis of soil arching effects in passive piles[J].Rock and Soil Mechanics,2004,25(2):174-179
[13] 林治平,刘祚秋,商秋婷.抗滑桩结构土拱的分拆与联合研究[J].岩土力学,2012,33(10):3109-3115 Lin Zhiping,Liu Zuoqiu,Shang Qiuting.Research on soil arch of anti-slide pile structure with methods of separation and combination[J].Rock and Soil Mechanics,2012,33(10):3109-3115
[14] 梁瑶,蒋楚生,李庆海,等.桩间复合结构土拱效应试验与受力机制研究[J].岩石力学与工程学报,2014,33(增2):3825-3828 Liang Yao,Jiang Chusheng,Li Qinghai,et al.Analysis of stress mechanism of pile composite structure based on soil arch test[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(S2):3825-3828
[15] 杨明,姚令侃,王广军.桩间土拱效应离心模型试验及数值模拟研究[J].岩土力学,2008,(3):817-822 Yang Ming,Yao Lingkan,Wang Guangjun.Study of centrifuge model tests and numerical simulation on soil arching in space of piles[J].Rock and Soil Mechanics,2008,(3):817-822
[16] 向先超,张华,蒋国盛,等.基于颗粒流的抗滑桩土拱效应研究[J].岩土工程学报,2011,33(3):343-387 Xiang Xianchao,Zhang Hua,Jiang Guosheng,et al.Deformation character of landslide and its supporting structure in area of metamorphic rocks[J].Chinese Journal of Rock Mechanics and Engineering,2011,33(3):343-387
[17] 姜春林.微型抗滑桩土拱效应空间特征的细观力学分析[J].岩土力学,2012,33(6):1755-1783 Jiang Chunlin.Mesomechanic alanalysis of spatial characteristics of soil arching effect on micro anti-slide pile system[J].Rock and Soil Mechanics,2012,33(6):1755-1783
[18] 房营光.桩承式路堤中土拱效应产生过程可视化分析[J].岩土工程学报,2015,37(9):1679-1686 Fang Yingguang.Visual analysis of initiation of soil arching effect in piled embankments[J].Chinese Journal of Rock Mechanics and Engineering,2015,37(9):1679-1686
[19] Eskisar T,Otani J,Hironaka J.Visualization of soil arching on reinforced embankment with rigid pile foundation using X-ray CT[J].Geotextiles and Geomembranes,2012,32(6):44-54
[20] 金林.基于红外热成像技术的抗滑桩土拱效应模型试验研究[J].岩土力学,2016,37(8):2333-2342 Jin Lin.Model test of soil arching effect of anti-slide piles based on infrared thermal imaging technology[J].Rock and Soil Mechanic,2016,37(8):2333-2342
[21] 赵法锁,罗丽娟,王雷.基于性能的拱型抗滑桩墙支护结构体系优化设计的思考[J].工程地质学报,2007,15(4):539-544 Zhao Fasuo,Luo Lijuan,Wang Lei.Optimization design of arch anti-slide pile wall supporting structure system based on performance[J].Journal of Engineering Geology,2007,15(4):539-544
[22] 罗丽娟,赵法锁,王爱忠.某变质岩滑坡及支护结构变形破坏特征[J].地球科学与环境学报,2008,2(2):177-182 Luo Lijuan,Zhao Fasuo,Wang Aizhong.Deformation character of landslide and its supporting structure in area of metamorphic rocks[J].Journal of Earth Sciences and Environment,2008,2(2):177-182
[23] 余艳霞.拱型单元组合抗滑桩体型研究[D].武汉:武汉理工大学,2006 Yu Yanxia.The research about the structure of the arc-shaped[D].Wuhan:Wuhan University of Technology,2006
[24] 岩土工程勘察规范:GB50021—2001[J].北京:中国建筑工业出版社,2011 Geotechnical Engineering Survey Specification:GB50021—2001[J].Beijing:China Building Industry Press,2011
[2] 王成华,陈永波,林立相.抗滑桩桩间土拱特性及最大桩间距分析[J].山地学报,2001,19(6):556-559 Wang Chenghua,Chen Yongbo,Lin Lixiang.Analysis of mechanical properties and maximum pile spacing of soil arch between stabilizing piles s[J].Journal of Mountain Research,2001,19(6):556-559
[3] 周德培,肖世国,夏雄.边坡工程抗滑桩间距的探讨[J].岩土工程学报,2004,26(1):132-135 Zhou Depei,Xiao Shiguo,Xia Xiong.Discussion on rational spacing between adjacent anti-slide pilesin some cutting slope projects[J].Chinese Journal of Rock Mechanics and Engineering,2004,26(1):132-135
[4] Li Changdong,Wu Junjie,Tang Huiming.A novel optimal plane arrangement of stabilizing piles based on soil arching effect and stability limit for 3D colluvial landslides[J].Engineering Geology,2015,195:236-247
[5] Chen Chineyuan,Numerical analysis of slope stabilization concepts using piles[D].The University of Southern California,Los Angeles,California,2001
[6] 杨雪强,吉小明,张新涛.抗滑桩桩间土拱效应及其土拱模式分析[J].中国公路学报,2014,27(1):30-37 Yang Xueqiang,Ji Xiaoming,Zhang Xintao.Analysis of soil arching effect between anti-slide piles and different arch body models[J].China Journal of Highway and Transport,2014,27(1):30-37
[7] Li Changdong,Tang Huiming,Hu Xinli.Numerical modelling study of the load sharing law of anti-sliding piles based on the soil arching effect for erliban landslide,China[J].Journal of Civil Engineering ,2013,17(6):1251-1262
[8] 张常亮,李同录,李萍.三维滑坡推力计算方法探讨[J].工程地质学报,2011,19(2):162-167,283 Zhang Changliang,Li Tonglu,Li Ping.Calculation metod for driving force of three-dimensional landslides[J].Journal of Engineering Geology,2011,19(2):162-167,283
[9] Mohamed Ashour,Hamed Ardalan.Analysis of pile stabbilized slopes based on soil-pile interaction[J].Computers and Geotechnics,2015,39:85-97
[10] 蒋建平,姚均东.滑体为黏土层的悬臂式抗滑桩三维土拱效应研究[J].应用基础与工程科学学报,2017,25(5):1011-1025 Jiang Jianping,Yao Jundong.Study on three dimensional soil arch effect of cantilever piles for stabilizing slope with clay sliding mass[J].Journal of Basic Science and Engineering,2017,25(5):1011-1025
[11] Chen C Y,Martin G R.Soil-structure interaction for landslide stabilizing piles[J].Computers and Geotechnics,2002,29(5):363-386
[12] 张建勋,陈福全,简洪钮.被动桩中土拱效应问题的数值分析[J].岩土力学,2004,25(2):174-179 Zhang Jianxun,Chen Fuquan,Jian Hongniu.Numerical analysis of soil arching effects in passive piles[J].Rock and Soil Mechanics,2004,25(2):174-179
[13] 林治平,刘祚秋,商秋婷.抗滑桩结构土拱的分拆与联合研究[J].岩土力学,2012,33(10):3109-3115 Lin Zhiping,Liu Zuoqiu,Shang Qiuting.Research on soil arch of anti-slide pile structure with methods of separation and combination[J].Rock and Soil Mechanics,2012,33(10):3109-3115
[14] 梁瑶,蒋楚生,李庆海,等.桩间复合结构土拱效应试验与受力机制研究[J].岩石力学与工程学报,2014,33(增2):3825-3828 Liang Yao,Jiang Chusheng,Li Qinghai,et al.Analysis of stress mechanism of pile composite structure based on soil arch test[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(S2):3825-3828
[15] 杨明,姚令侃,王广军.桩间土拱效应离心模型试验及数值模拟研究[J].岩土力学,2008,(3):817-822 Yang Ming,Yao Lingkan,Wang Guangjun.Study of centrifuge model tests and numerical simulation on soil arching in space of piles[J].Rock and Soil Mechanics,2008,(3):817-822
[16] 向先超,张华,蒋国盛,等.基于颗粒流的抗滑桩土拱效应研究[J].岩土工程学报,2011,33(3):343-387 Xiang Xianchao,Zhang Hua,Jiang Guosheng,et al.Deformation character of landslide and its supporting structure in area of metamorphic rocks[J].Chinese Journal of Rock Mechanics and Engineering,2011,33(3):343-387
[17] 姜春林.微型抗滑桩土拱效应空间特征的细观力学分析[J].岩土力学,2012,33(6):1755-1783 Jiang Chunlin.Mesomechanic alanalysis of spatial characteristics of soil arching effect on micro anti-slide pile system[J].Rock and Soil Mechanics,2012,33(6):1755-1783
[18] 房营光.桩承式路堤中土拱效应产生过程可视化分析[J].岩土工程学报,2015,37(9):1679-1686 Fang Yingguang.Visual analysis of initiation of soil arching effect in piled embankments[J].Chinese Journal of Rock Mechanics and Engineering,2015,37(9):1679-1686
[19] Eskisar T,Otani J,Hironaka J.Visualization of soil arching on reinforced embankment with rigid pile foundation using X-ray CT[J].Geotextiles and Geomembranes,2012,32(6):44-54
[20] 金林.基于红外热成像技术的抗滑桩土拱效应模型试验研究[J].岩土力学,2016,37(8):2333-2342 Jin Lin.Model test of soil arching effect of anti-slide piles based on infrared thermal imaging technology[J].Rock and Soil Mechanic,2016,37(8):2333-2342
[21] 赵法锁,罗丽娟,王雷.基于性能的拱型抗滑桩墙支护结构体系优化设计的思考[J].工程地质学报,2007,15(4):539-544 Zhao Fasuo,Luo Lijuan,Wang Lei.Optimization design of arch anti-slide pile wall supporting structure system based on performance[J].Journal of Engineering Geology,2007,15(4):539-544
[22] 罗丽娟,赵法锁,王爱忠.某变质岩滑坡及支护结构变形破坏特征[J].地球科学与环境学报,2008,2(2):177-182 Luo Lijuan,Zhao Fasuo,Wang Aizhong.Deformation character of landslide and its supporting structure in area of metamorphic rocks[J].Journal of Earth Sciences and Environment,2008,2(2):177-182
[23] 余艳霞.拱型单元组合抗滑桩体型研究[D].武汉:武汉理工大学,2006 Yu Yanxia.The research about the structure of the arc-shaped[D].Wuhan:Wuhan University of Technology,2006
[24] 岩土工程勘察规范:GB50021—2001[J].北京:中国建筑工业出版社,2011 Geotechnical Engineering Survey Specification:GB50021—2001[J].Beijing:China Building Industry Press,2011
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