预应力锚索修复含微裂纹抗滑桩模型试验研究
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摘要
施加预应力锚索是修复含微裂纹抗滑桩最重要的手段之一。为了探讨施加预应力锚索修复含微裂纹抗滑桩的可行性以及修复过程中抗滑桩变形破坏特征,采用大型物理模型试验对预应力锚索修复含微裂纹抗滑桩进行了研究。试验结果表明,施加预应力锚索修复含微裂纹抗滑桩可提高抗滑桩承载储备能力;滑坡荷载-桩顶位移曲线可分为挤密、线弹性变形与破坏3个阶段;滑坡荷载下桩体在滑面附近位置发生破坏,破坏具有突发性;预应力荷载下抗滑桩在锚索孔位置产生拉破坏,并伴随滑面位置裂纹的扩展;滑坡荷载下桩后土压力呈三角形分布,施加预应力荷载后土压力呈倒梯形分布;锚索预应力的施加降低了弯矩峰值,但最大弯矩位置向锚索孔位置以及滑面附近位置转移,该2处位置是采用预应力锚索修复抗滑桩的薄弱部位。研究成果对于预应力锚索修复含微裂纹抗滑桩技术的推广应用以及抗滑桩修复工程的设计具有指导意义。
Application of prestressed anchor cables is one of the most important methods to repair anti-slide piles with micro-cracks. This paper examines the anti-slide pile with micro-crack repaired by prestressed anchor cables by using of the large physical model test,to discuss the feasibility of anti-slide pile repair and to obtain the characteristics of deformation and failure during the repair engineering. Test results show that( 1)application of prestress anchor cables can improve the bearing capacity of piles with micro-cracks;( 2) the characteristic curve of pile top displacement under the landslide loading can be divided into three stages,i. e.,the stage of compaction,elastic deformation and failure;( 3) failure occurs in the pile near the location of the sliding surface under the landslide loading,and this failure is sudden,and tension failure occurs in the pile at the location of the anchor hole under the anchor cable prestress,meanwhile,cracks extend at the location of the sliding surface. The soil pressure presents triangular distribution under the landslide loading and inverted trapezoidal distribution under the anchor cable prestress,and the earth pressure peak is transferred from the sliding surface to the pile top. Prestress applied to piles lowers the value of the maximum bending moment,but the position of the maximum bending moment transfers to the anchor hole position and the position near the sliding surface,thus the two positions are the weak part of the pile by using of the prestressed anchor cables to repair the pile with micro-crack. The research results are of guiding significance for the popularization and application of anti-slide pile with micro-cracks repaired with prestressed anchor cables and the design of anti-slide pile repairing projects.
Application of prestressed anchor cables is one of the most important methods to repair anti-slide piles with micro-cracks. This paper examines the anti-slide pile with micro-crack repaired by prestressed anchor cables by using of the large physical model test,to discuss the feasibility of anti-slide pile repair and to obtain the characteristics of deformation and failure during the repair engineering. Test results show that( 1)application of prestress anchor cables can improve the bearing capacity of piles with micro-cracks;( 2) the characteristic curve of pile top displacement under the landslide loading can be divided into three stages,i. e.,the stage of compaction,elastic deformation and failure;( 3) failure occurs in the pile near the location of the sliding surface under the landslide loading,and this failure is sudden,and tension failure occurs in the pile at the location of the anchor hole under the anchor cable prestress,meanwhile,cracks extend at the location of the sliding surface. The soil pressure presents triangular distribution under the landslide loading and inverted trapezoidal distribution under the anchor cable prestress,and the earth pressure peak is transferred from the sliding surface to the pile top. Prestress applied to piles lowers the value of the maximum bending moment,but the position of the maximum bending moment transfers to the anchor hole position and the position near the sliding surface,thus the two positions are the weak part of the pile by using of the prestressed anchor cables to repair the pile with micro-crack. The research results are of guiding significance for the popularization and application of anti-slide pile with micro-cracks repaired with prestressed anchor cables and the design of anti-slide pile repairing projects.
引文
[1]周德培,肖世国,夏雄.边坡工程中抗滑桩合理桩间距的探讨[J].岩土工程学报,2004,26(1):132-135.[ZHOU D P,XIAO S G,XIA X. Discussion on rational spacing between adjacent anti-slide piles in some cutting slope projects[J]. Chinese Journal of Geotechnical Engineering,2004,26(1):132-135.(in Chinese)]
[2]冯树荣,蒋中明,秦卫星,等.江坪河水电站进水口顺层岩体边坡支护结构受力特性及稳定性研究[J].水文地质工程地质,2014,41(6):51-56.[FENG S R,JIANG Z M,QIN W X,et al. Stability analysis of the stratified rock mass slope near the inlet of the Jiangpinghe hydropower engineering and the bearing performance of the support structure[J].Hydrogeology&Engineering Geology,2014,41(6):51-56.(in Chinese)]
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[4]肖燃.抗滑桩震损破坏特征分析及修复加固方法研究[D].成都:成都理工大学,2015.[XIAO R.Analysis of characteristics of earthquake damage of anti-slide pile damage and repair reinforcement method research[D]. Chengdu:Chengdu University of Technology,2015.(in Chinese)]
[5]陈林,姚勇,杨炯,等.某边坡抗滑桩失效机理研究[J].四川建筑科学研究,2014,40(2):136-140.[CHEN L,YAO Y,YANG J,et al. Failure mechanism of a slope anti-sliding pile[J]. Building Science Research of Sichuan,2014,40(2):136-140.(in Chinese)]
[6]李红武.抗滑桩开裂后的工程安全性评价[J].土工基础, 2006,20(3):39-41.[LI H W.Apprecisation of engineering safety after the cracking of slide-proof piles[J]. Soil Engineering and Foundation,2006,20(3):39-41.(in Chinese)]
[7]陈中学,邵树强,李文广.抗滑桩支挡边坡失效实例分析[J].公路交通技术,2016,32(3):31-34.[CHEN Z X,SHAO S Q,LI W G. Analysis for failure examples of anti-slide pile support slope[J].Technology of Highway and Transport,2016,32(3):31-34.(in Chinese)]
[8]徐建强,任伟中,黄诚.广西某滑坡双排抗滑桩加固设计[J].工程勘察,2011,39(9):1-4.[XU J Q,REN W Z,HUANG C. Design of two-row antislide piles strengthening certain landslide in Guangxi[J]. Geotechnical Investigation&Surveying,2011,39(9):1-4.(in Chinese)]
[9]王引生,王恭先,王祯,等.预应力锚索抗滑桩结构优化[J].中国铁道科学,2007,28(5):11-14.[WANG Y S, WANG G X, WANG Z, et al.Optimization of anti-slide pile with prestressed anchor cable[J]. China Railway Science,2007,28(5):11-14.(in Chinese)]
[10]冯玉国,王渭明,刘军熙.预应力锚索抗滑桩结构稳健优化设计[J].岩土工程学报,2009,31(4):515-520.[FENG Y G,WANG W M,LIU J X.Robust optimization design of anti-slide piles with prestressed anchor cables[J]. Chinese Journal of Geotechnical Engineering,2009,31(4):515-520.(in Chinese)]
[11]刘永莉,孙红月.抗滑桩变形监测及位移确定研究[J].岩石力学与工程学报,2013,32(10):2147-2153.[LIU Y L,SUN H Y. Research on deformation monitoring and determination of displacement of antislide piles[J]. Chinese Journal of Rock Mechanics and Engineering,2013,32(10):2147-2153.(in Chinese)]
[12]孙峰,孔纪名,贾超,等.地震作用下碎石土滑坡抗滑桩的变形破坏机理[J].长江科学院院报,2017,34(7):77-81.[SUN F,KONG J M,JIA C,et al. Mechanism of deformation failure of anti-slide piles in debris landslide under earthquake action[J].Journal of Yangtze River Scientific Research Institute,2017,34(7):77-81.(in Chinese)]
[13]铁道部第二勘测设计院.抗滑桩设计与计算[M].北京:中国铁道出版社,1983.[Institute of Second Survey and Design of the Ministry of Railways.Design and calculation of anti-sliding pile[J].Beijing:China Railway Publishing House,1983.(in Chinese)]
[14]王成,梁波.新型支挡结构[M].成都:西南交通大学出版社,2011.[WANG C,LIANG B. New retaining structure[J]. Chengdu:Southwest Jiaotong University Press,2011.(in Chinese)]
[15]宋雅坤,郑颖人,雷文杰.沉埋式抗滑桩机制模型试验数值分析研究[J].岩土力学,2007,28(增刊1):63-68.[SONG Y K,ZHENG Y R,LEI W J. Analysis of the experimental mechanism of deeply buried anti-slide pile by FEM[J]. Rock and Soil Mechanics, 2007,28(Sup1):63-68.(in Chinese)]
[16] ASHOUR M, ARDALAN H. Analysis of pile stabilized slopes based on soil-pile interaction[J].Computers&Geotechnics,2012,39(1):85-97.
[17]李凯玲,门玉明.锚索抗滑桩与岩土体相互作用研究[J].水文地质工程地质,2006,33(1):20-22.[LI K L,MEN Y M. Study of the interaction among anti-slide pile,anchor and soil body[J].Hydrogeology&Engineering Geology,2006,33(1):20-22.(in Chinese)]
[2]冯树荣,蒋中明,秦卫星,等.江坪河水电站进水口顺层岩体边坡支护结构受力特性及稳定性研究[J].水文地质工程地质,2014,41(6):51-56.[FENG S R,JIANG Z M,QIN W X,et al. Stability analysis of the stratified rock mass slope near the inlet of the Jiangpinghe hydropower engineering and the bearing performance of the support structure[J].Hydrogeology&Engineering Geology,2014,41(6):51-56.(in Chinese)]
[3]沈康健,苟栋元,谭玲.公路抗滑桩工程失效机制及功能修复技术[J].工程技术,2016(4):174-176.[SHEN K J,GOU D Y,TAN L,et al. Failure mechanism and functional repair technology of highway anti-slide pile engineering[J]. Engineering Technology,2016(4):174-176.(in Chinese)]
[4]肖燃.抗滑桩震损破坏特征分析及修复加固方法研究[D].成都:成都理工大学,2015.[XIAO R.Analysis of characteristics of earthquake damage of anti-slide pile damage and repair reinforcement method research[D]. Chengdu:Chengdu University of Technology,2015.(in Chinese)]
[5]陈林,姚勇,杨炯,等.某边坡抗滑桩失效机理研究[J].四川建筑科学研究,2014,40(2):136-140.[CHEN L,YAO Y,YANG J,et al. Failure mechanism of a slope anti-sliding pile[J]. Building Science Research of Sichuan,2014,40(2):136-140.(in Chinese)]
[6]李红武.抗滑桩开裂后的工程安全性评价[J].土工基础, 2006,20(3):39-41.[LI H W.Apprecisation of engineering safety after the cracking of slide-proof piles[J]. Soil Engineering and Foundation,2006,20(3):39-41.(in Chinese)]
[7]陈中学,邵树强,李文广.抗滑桩支挡边坡失效实例分析[J].公路交通技术,2016,32(3):31-34.[CHEN Z X,SHAO S Q,LI W G. Analysis for failure examples of anti-slide pile support slope[J].Technology of Highway and Transport,2016,32(3):31-34.(in Chinese)]
[8]徐建强,任伟中,黄诚.广西某滑坡双排抗滑桩加固设计[J].工程勘察,2011,39(9):1-4.[XU J Q,REN W Z,HUANG C. Design of two-row antislide piles strengthening certain landslide in Guangxi[J]. Geotechnical Investigation&Surveying,2011,39(9):1-4.(in Chinese)]
[9]王引生,王恭先,王祯,等.预应力锚索抗滑桩结构优化[J].中国铁道科学,2007,28(5):11-14.[WANG Y S, WANG G X, WANG Z, et al.Optimization of anti-slide pile with prestressed anchor cable[J]. China Railway Science,2007,28(5):11-14.(in Chinese)]
[10]冯玉国,王渭明,刘军熙.预应力锚索抗滑桩结构稳健优化设计[J].岩土工程学报,2009,31(4):515-520.[FENG Y G,WANG W M,LIU J X.Robust optimization design of anti-slide piles with prestressed anchor cables[J]. Chinese Journal of Geotechnical Engineering,2009,31(4):515-520.(in Chinese)]
[11]刘永莉,孙红月.抗滑桩变形监测及位移确定研究[J].岩石力学与工程学报,2013,32(10):2147-2153.[LIU Y L,SUN H Y. Research on deformation monitoring and determination of displacement of antislide piles[J]. Chinese Journal of Rock Mechanics and Engineering,2013,32(10):2147-2153.(in Chinese)]
[12]孙峰,孔纪名,贾超,等.地震作用下碎石土滑坡抗滑桩的变形破坏机理[J].长江科学院院报,2017,34(7):77-81.[SUN F,KONG J M,JIA C,et al. Mechanism of deformation failure of anti-slide piles in debris landslide under earthquake action[J].Journal of Yangtze River Scientific Research Institute,2017,34(7):77-81.(in Chinese)]
[13]铁道部第二勘测设计院.抗滑桩设计与计算[M].北京:中国铁道出版社,1983.[Institute of Second Survey and Design of the Ministry of Railways.Design and calculation of anti-sliding pile[J].Beijing:China Railway Publishing House,1983.(in Chinese)]
[14]王成,梁波.新型支挡结构[M].成都:西南交通大学出版社,2011.[WANG C,LIANG B. New retaining structure[J]. Chengdu:Southwest Jiaotong University Press,2011.(in Chinese)]
[15]宋雅坤,郑颖人,雷文杰.沉埋式抗滑桩机制模型试验数值分析研究[J].岩土力学,2007,28(增刊1):63-68.[SONG Y K,ZHENG Y R,LEI W J. Analysis of the experimental mechanism of deeply buried anti-slide pile by FEM[J]. Rock and Soil Mechanics, 2007,28(Sup1):63-68.(in Chinese)]
[16] ASHOUR M, ARDALAN H. Analysis of pile stabilized slopes based on soil-pile interaction[J].Computers&Geotechnics,2012,39(1):85-97.
[17]李凯玲,门玉明.锚索抗滑桩与岩土体相互作用研究[J].水文地质工程地质,2006,33(1):20-22.[LI K L,MEN Y M. Study of the interaction among anti-slide pile,anchor and soil body[J].Hydrogeology&Engineering Geology,2006,33(1):20-22.(in Chinese)]
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