基于FLAC3D的危岩撑-锚联合支护分配比研究
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摘要
针对危岩治理工程撑-锚联合支护分配比问题,采用FLAC3D模拟程序,以万州首立山危岩W32治理工程为例,通过监控点位移指标开展危岩撑-锚联合支护分配比模拟研究,初步获得如下结论:万州首立山危岩W32稳定系数、位移云图、监控点位移变化率均表明,危岩处于非稳定状态,并受后缘卸荷结构面与岩腔控制;采用500 k N支撑柱支护力下危岩最大位移比未支护条件下降低87.2%,而采用500 k N锚固支护力下危岩最大位移降低为84.0%; 2个单独支护措施均可较好地支撑危岩稳定性,但在危岩长期荷载作用下,支撑柱支护措施将失去其控制位移的优势,而锚固可发挥其控制位移的优势。采用500 k N撑-锚联合支护力下危岩最大位移降低超过95%,显示出比单独采用支撑柱或锚固较好的支护效果,同时,基于监控点最大位移分析得出撑-锚联合支护的最佳分配比为6∶4。
For the question of distribution ratio for combined spore-anchor supporting of unstable rock engineering,taking the unstable rock W32 in Shouli Mountain,Wanzhou City,this paper carried out the simulation study on the distribution ratio for combined spore-anchor supporting by means of monitoring displacement.It can be concluded that stability coefficient,displacement cloud and displacement gradients of monitoring points of unstable rock W32 indicated its instability,which was controlled by bedding surface and unloading plane;The maximum displacement at 500 kN of supporting spore reduced by 87.2% compared with no supporting,meanwhile,the maximum displacement at 500 kN of anchor reduced by 84.0% compared with no supporting,thus,supporting spore and rock anchor both nicely supported the stability of unstable rock.However,the supporting spore could lose its advantage of controlling displacement,but rock anchor could give play to its advantage of controlling displacement.The maximum displacement at 500 kN of conbined sporeanchor reduced by mora than 95% compared with no supporting,which indicated better supporting effect than that of the single supporting spore or rock anchor.Simultaneously,this paper analyzed that the best distribution ratio of conbined spore-anchor was 6:4 based on monitoring displacement.
For the question of distribution ratio for combined spore-anchor supporting of unstable rock engineering,taking the unstable rock W32 in Shouli Mountain,Wanzhou City,this paper carried out the simulation study on the distribution ratio for combined spore-anchor supporting by means of monitoring displacement.It can be concluded that stability coefficient,displacement cloud and displacement gradients of monitoring points of unstable rock W32 indicated its instability,which was controlled by bedding surface and unloading plane;The maximum displacement at 500 kN of supporting spore reduced by 87.2% compared with no supporting,meanwhile,the maximum displacement at 500 kN of anchor reduced by 84.0% compared with no supporting,thus,supporting spore and rock anchor both nicely supported the stability of unstable rock.However,the supporting spore could lose its advantage of controlling displacement,but rock anchor could give play to its advantage of controlling displacement.The maximum displacement at 500 kN of conbined sporeanchor reduced by mora than 95% compared with no supporting,which indicated better supporting effect than that of the single supporting spore or rock anchor.Simultaneously,this paper analyzed that the best distribution ratio of conbined spore-anchor was 6:4 based on monitoring displacement.
引文
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[14]蒋凤昌,朱慈勉,薛剑胜,等.锈蚀钢筋压屈名义本构关系的试验研究及应用[J].东南大学学报(自然科学版),2010,40(4):816-821.[JIANG FC,ZHU C M,XUE J S,et al.Experiments and application of buckling nominal constitutive relations of corroded reinforcements[J].Journal of Southeast University(Natural Science Edition),2010,40(4):816-821.(in Chinese)]
[15]陈武雄.FRP加固锈蚀RC柱力学性能及其锈蚀钢筋屈曲特性的试验研究[D].深圳:深圳大学,2015.[CHEN X W.Experimental study on mechanical properties and buckling characteristics of corroded RC columns reinforced by FRP[D].Shenzhen:Shenzhen University,2015.(in Chinese)]
[2]叶四桥,陈洪凯,唐红梅.危岩落石防治技术体系及其特点[J].公路,2010(7):80-85.[YE S Q,CHEN H K,TANG H M.Rockfall mitigation techniques and its characteristics[J].Highway,2010(7):80-85.(in Chinese)]
[3]杨丹,胡卸文,胡亚运.硐室片状危岩体病害机理分析与评价方法[J].水文地质工程地质,2018,45(3):138-145.[YANG D,HU X W,HU Y Y.Mechanism analyses and evaluation methods of schistose dangerous rock mass in cavern[J].Hydrogeology&Engineering Geology,2018,45(3):138-148.(in Chinese)]
[4]乐琪浪,孙秀娟,蔡玲玲,等.三峡库区望霞危岩体地质模式及变形破坏过程[J].水文地质工程地质,2015,42(6):154-158.[LE Q L,SUN X J,CAI L L,et al.Geological model and deformation failure process of the Wangxia unstable rock mass in the Three Gorges Reservoir[J].Hydrogeology&Engineering Geology,2015,42(6):154-158.(in Chinese)]
[5]陈洪凯,唐红梅,胡明,等.危岩锚固计算方法研究[J].岩石力学与工程学报,2005,24(8):1321-1327.[CHEN H K,TANG H M,HU M,et al.Research on anchorage calculation method for unstable rock[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(8):1321-1327.(in Chinese)]
[6]陈洪凯,鲜学福,唐红梅,等.三峡库区危岩群发性机理与防治---以万州太白岩为例[J].重庆大学学报(自然科学版),2008,31(10):1178-1184.[CHEN H K,XIAN X F,TANG H M,et al.A massive development mechanism and countermeasures for perilous rocks in the Three Gorges Reservoir area of P.R.China:The example of the Taibaiyan cliff at Wanzhou[F].Journal of Chongqing University(Natural Science Edition),2008,31(10):1178-1184.(in Chinese)]
[7]陈洪凯,唐红梅,刘光华,等.危岩支撑及支撑-锚固联合计算方法研究[J].岩土工程学报,2004,26(3):383-388.[CHEN H K,TANG H M,LIU G H,et al.Researches on calculation method of support and support-anchorage union to unstable rock[J].Chinese Journal of Geotechnical Engineering,2004,26(3):383-388.(in Chinese)]
[8]叶四桥,唐红梅,祝辉.基于落石运动特性分析的拦石网设计理念[J].岩土工程学报,2007,29(4):566-571.[YE S Q,TANG H M,ZHU H.Design conception of safe net system based on analysis of motion trace of rockfall[J].Chinese Journal of Geotechnical Engineering,2007,29(4):566-571.(in Chinese)]
[9]史彦文.锚索框架梁和抗滑桩联合支护在路基高边坡滑坡治理中的应用[J].公路,2004(2):89-91.[SHI Y W.Application of combining support of frame beams of prestressed anchor rope and anti-slide piles to treatment of landslide of high slope[J].Highway,2004(2):89-91.(in Chinese)]
[10]付晓,张建经,周立荣.多级框架锚索和抗滑桩联合作用下边坡抗震性能的振动台试验研究[J].岩土力学,2017,38(2):462-470.[FU X,ZHANG JJ,ZHOU L R.Shaking table test of seismic response of slope reinforced by combination of anti-slide piles and multi-frame foundation beam with anchor cable[J].Rock and Soil Mechanics,2017,38(2):462-470.(in Chinese)]
[11]孟庆山,孔令伟,陈能远,等.桩锚挡墙联合支护残积土边坡离心模型试验研究[J].岩土力学,2010,31(11):3379-3384.[MENG Q S,KONG LW,CHEN N Y,et al.Centrifugal model test on slope supporting with pile-anchor combined retaining wall[J].Rock and Soil Mechanics,2010,31(11):3379-3384.(in Chinese)]
[12]陈长流,叶帅华,朱彦鹏.预应力锚杆与土钉联合支护体系在兰州深基坑工程中的应用与监测分析[J].岩土工程学报,2012,34(增刊1):484-489.[CHEN C L,YE S H,ZHU Y P.Application and monitoring analysis of combined supporting system by prestressed anchors and soil nails for a deep excavation in Lanzhou[J].Chinese Journal of Geotechnical Engineering,2012,34(Sup1):484-489.(in Chinese)]
[13]俞海波,王红雨,王卫东,等.排桩与土钉墙联合支护基坑变形数值模拟[J].长江科学院院报,2017,34(3):96-99.[YU H B,WANG H U,WANG W D,et al.Numerical simulation on deformation of excavation pit supported by row piles and soil nailing[J].Journal of Yangtze River Scientific Research Institute,2017,34(3):96-99.(in Chinese)]
[14]蒋凤昌,朱慈勉,薛剑胜,等.锈蚀钢筋压屈名义本构关系的试验研究及应用[J].东南大学学报(自然科学版),2010,40(4):816-821.[JIANG FC,ZHU C M,XUE J S,et al.Experiments and application of buckling nominal constitutive relations of corroded reinforcements[J].Journal of Southeast University(Natural Science Edition),2010,40(4):816-821.(in Chinese)]
[15]陈武雄.FRP加固锈蚀RC柱力学性能及其锈蚀钢筋屈曲特性的试验研究[D].深圳:深圳大学,2015.[CHEN X W.Experimental study on mechanical properties and buckling characteristics of corroded RC columns reinforced by FRP[D].Shenzhen:Shenzhen University,2015.(in Chinese)]
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