预应力锚索地梁结构在边坡稳定中的作用机理
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摘要
建立受非均布线形荷载作用的地基力学模型,应用叠加原理推导出预应力锚索-地梁结构中垂直于梁轴线平面内的地基中深度z处的应力和位移计算公式,为研究预应力锚索-地梁结构在岩体中的传力规律提供理论依据。以溆怀(湖南溆浦—怀化)高速公路K24+233-K27+89边坡为实险区域研究预应力锚索地梁结构在边坡稳定中的作用机理。研究结果表明:在对锚索施加预应力后,锚索预应力通过地梁传递给被加固的岩土体,在垂直于地梁轴线的平面内,其传递方式以梁轴线与该平面的交点为端点的近似橢圆的等值面形式由内向外呈逐渐衰减趋势分布;两地梁周边岩体中的压应变随深度增加由小到大增至峰值,然后逐渐衰减为0,这种分布形式与理论结论一致。
The force transmission law of a prestressed anchor-rope and the groundsill structure in rock mass were studied.The foundation mechanical model of nonuniform linear unipoium load under the premise of the ground surface suffering nonuniform linear load was established and deduced by the superposition principle,and the calculating formula for the stress and displacement at the depth z in the foundation of the beam axis was deduced for the prestressed anchor-rope and groundsill structure.Taking the slope of K24+233—K27+89 of Xupu—Huaihua Expressway as a experimental region,the force transmission law of prestressed anchor-rope and groundsill structure in slope stability were studied.The results show that when the anchor cable is provided with pre-stress,the actual prestress in the prestressed cable anchor can be transferred to the strengthening geotechnical body through the ground beam,of which the transfer mode tends to decay from the inside to the outside in the form of approximate ellipse iso-surface with the endpoints.The intersection of the beam axis and the plane are perpendicular to the axis of the beam.The compressed strain in the peripheral rock of two ground beams tends to increase with the increase of the depth of the anchor,and then tends to decay gradually and finally tends to be 0 after reaching its peak value.This distribution form is in accordance with the theoretical form.
The force transmission law of a prestressed anchor-rope and the groundsill structure in rock mass were studied.The foundation mechanical model of nonuniform linear unipoium load under the premise of the ground surface suffering nonuniform linear load was established and deduced by the superposition principle,and the calculating formula for the stress and displacement at the depth z in the foundation of the beam axis was deduced for the prestressed anchor-rope and groundsill structure.Taking the slope of K24+233—K27+89 of Xupu—Huaihua Expressway as a experimental region,the force transmission law of prestressed anchor-rope and groundsill structure in slope stability were studied.The results show that when the anchor cable is provided with pre-stress,the actual prestress in the prestressed cable anchor can be transferred to the strengthening geotechnical body through the ground beam,of which the transfer mode tends to decay from the inside to the outside in the form of approximate ellipse iso-surface with the endpoints.The intersection of the beam axis and the plane are perpendicular to the axis of the beam.The compressed strain in the peripheral rock of two ground beams tends to increase with the increase of the depth of the anchor,and then tends to decay gradually and finally tends to be 0 after reaching its peak value.This distribution form is in accordance with the theoretical form.
引文
[1]吕庆,孙红月,尚岳全.预应力锚索框格梁体系加固破碎岩质边坡合理间距研究[J].岩石力学与工程学报,2006,25(1):136-140.LüQing,SUN Hongyue,SHANG Yuequan.Study on properinterval of prestressed cables in reinforcing crush rock slope[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(1):136-140.
[2]程良奎.我国岩土锚固技术的现状与发展[C]//岩土工程中的锚固技术.北京:地震出版社,1992:27-61.CHENG Liangkui.China’s rock anchor of the status quo anddevelopment of technology[C]//Geotechnical EngineeringTechnology Anchor.Beijing:Earthquake Publishing House,1992:27-61.
[3]李德芳,张友良,陈从新.边坡加固中预应力锚索地梁内力计算[J].岩土力学,2000,21(2):170172.LI Defang,ZHANG Youliang,CHEN Congxin.Design ofprestressed-cable sommer for slope-reinforcing engineering[J].Rock and Soil Mechanics,2000,21(2):170-172.
[4]夏雄,周德培.弹性地基上预应力锚索地梁内力的计算方法[J].铁道标准设计,2005(1):46-48.XIA Xiong,ZHOU Depei.A method of internal force calculationon prestressed anchor cable beam on winkler elasticfoundation[J].Railway Standard Design,2005(1):46-48.
[5]丁秀丽,盛谦,韩军,等.预应力锚索锚固机理的数值模拟试验研究[J].岩石力学与工程学报,2002,21(7):980-988.DING Xiuli,SHENG Qian,HAN Jun,et al.Numericalsimulation testing shudy on mechanism of prestressed anchoragecable[J].Chinese Journal of Rock Mechanics and Engineering,2002,21(7):980-988.
[6]Nakayama M,Beaudoin B B.A novel technique determiningbond strength developed between cement paste and steel[J].Cement and Concrete Research,1987,22(3):478-488.
[7]Goto Y.Cracks formed in concrete around deformed tensionbars[J].Journal of American Concrete Institute,1971,68(4):244-251.
[8]Hansor N W.Influcence of surface roughness of prestressingstrand on band performance[J].Journal of Prestressed ConcreteInstitute,1969,14(1):32-45.
[9]Fuller P G,Cox R H T.Mechanics load transfer from steeltendons of cement based grouted[C]//Fifth AustralasianConference on the Mechanics of Structures and Materials.Melbourne:Australasian Institute of Mining and Metallurgy,1995:32-48.
[10]宋从军,周德培,肖世国.预应力锚索地梁的内力计算[J].岩土力学,2002,23(2):242245.SONG Congjun,ZHOU Depei,XIAO Shiguo.Application ofprestressed anchor-rope and groundsill to slope stability[J].Rockand Soil Mechanics,2002,23(2):242-245.
[11]徐年丰,牟春霞,王利.预应力岩锚内锚段作用机理与计算方法探讨[J].长江科学院院报,2002,19(3):45-47.XU Nianfeng,MU Chunxia,WANG Li.Exploration on workingmechanism and calculating method of inner bonding section ofprestressed cables within rock mass[J].Yangtze River ScientificResearch Institute from Internet,2002,19(3):45-47.
[12]李海光.新型支挡结构设计与工程实例[M].北京:人民交通出版社,2004:318327.LI Haiguang.Example of design and engineering in new branchnotch structure[M].Beijing:People’s CommunicationsPublishing House,2004:318-327.
[13]赵明阶,何光春,王多垠.边坡处理技术[M].北京:人民交通出版社,2003:123125.ZHAO Mingjie,HE Guangchun,WANG Duoyen.Slopetreatment technology[M].Beijing:People’s CommunicationsPublishing House,2003:123-125.
[14]郑西贵,张农,薛飞.预应力锚杆锚固段应力分布规律及分析[J].采矿与安全工程学报,2012,29(3):365-370.ZHENG Xigui,ZHANG Nong,XUE Fei.Study on stressdistribution law in anchoring section of prestressed bolt[J].Journal of Mining&Safety Engineering,2012,29(3):365-370.
[2]程良奎.我国岩土锚固技术的现状与发展[C]//岩土工程中的锚固技术.北京:地震出版社,1992:27-61.CHENG Liangkui.China’s rock anchor of the status quo anddevelopment of technology[C]//Geotechnical EngineeringTechnology Anchor.Beijing:Earthquake Publishing House,1992:27-61.
[3]李德芳,张友良,陈从新.边坡加固中预应力锚索地梁内力计算[J].岩土力学,2000,21(2):170172.LI Defang,ZHANG Youliang,CHEN Congxin.Design ofprestressed-cable sommer for slope-reinforcing engineering[J].Rock and Soil Mechanics,2000,21(2):170-172.
[4]夏雄,周德培.弹性地基上预应力锚索地梁内力的计算方法[J].铁道标准设计,2005(1):46-48.XIA Xiong,ZHOU Depei.A method of internal force calculationon prestressed anchor cable beam on winkler elasticfoundation[J].Railway Standard Design,2005(1):46-48.
[5]丁秀丽,盛谦,韩军,等.预应力锚索锚固机理的数值模拟试验研究[J].岩石力学与工程学报,2002,21(7):980-988.DING Xiuli,SHENG Qian,HAN Jun,et al.Numericalsimulation testing shudy on mechanism of prestressed anchoragecable[J].Chinese Journal of Rock Mechanics and Engineering,2002,21(7):980-988.
[6]Nakayama M,Beaudoin B B.A novel technique determiningbond strength developed between cement paste and steel[J].Cement and Concrete Research,1987,22(3):478-488.
[7]Goto Y.Cracks formed in concrete around deformed tensionbars[J].Journal of American Concrete Institute,1971,68(4):244-251.
[8]Hansor N W.Influcence of surface roughness of prestressingstrand on band performance[J].Journal of Prestressed ConcreteInstitute,1969,14(1):32-45.
[9]Fuller P G,Cox R H T.Mechanics load transfer from steeltendons of cement based grouted[C]//Fifth AustralasianConference on the Mechanics of Structures and Materials.Melbourne:Australasian Institute of Mining and Metallurgy,1995:32-48.
[10]宋从军,周德培,肖世国.预应力锚索地梁的内力计算[J].岩土力学,2002,23(2):242245.SONG Congjun,ZHOU Depei,XIAO Shiguo.Application ofprestressed anchor-rope and groundsill to slope stability[J].Rockand Soil Mechanics,2002,23(2):242-245.
[11]徐年丰,牟春霞,王利.预应力岩锚内锚段作用机理与计算方法探讨[J].长江科学院院报,2002,19(3):45-47.XU Nianfeng,MU Chunxia,WANG Li.Exploration on workingmechanism and calculating method of inner bonding section ofprestressed cables within rock mass[J].Yangtze River ScientificResearch Institute from Internet,2002,19(3):45-47.
[12]李海光.新型支挡结构设计与工程实例[M].北京:人民交通出版社,2004:318327.LI Haiguang.Example of design and engineering in new branchnotch structure[M].Beijing:People’s CommunicationsPublishing House,2004:318-327.
[13]赵明阶,何光春,王多垠.边坡处理技术[M].北京:人民交通出版社,2003:123125.ZHAO Mingjie,HE Guangchun,WANG Duoyen.Slopetreatment technology[M].Beijing:People’s CommunicationsPublishing House,2003:123-125.
[14]郑西贵,张农,薛飞.预应力锚杆锚固段应力分布规律及分析[J].采矿与安全工程学报,2012,29(3):365-370.ZHENG Xigui,ZHANG Nong,XUE Fei.Study on stressdistribution law in anchoring section of prestressed bolt[J].Journal of Mining&Safety Engineering,2012,29(3):365-370.
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