| 高恒阻大变形锚索静力学特性数值模拟分析及应用 |
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| 作者姓名： | 陶志刚 李梦楠 庞仕辉 谷明 何满潮 |
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| 作者单位： | 1深部岩土力学与地下工程国家重点实验室,北京100083;2中国矿业大学(北京)力学与建筑工程学院,北京100083;3本溪钢铁集团南芬露天铁矿,辽宁 本溪117000 |
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| 基金项目： | 国家重点研发计划;中央高校基本科研业务费专项 |
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| 摘 要： | 近些年,滑坡地质灾害发生的强度和频率逐年上升。 在滑坡发生过程中,传统预应力锚索无法 抵抗岩土体大变形而发生拉断、破坏、失效等问题。 针对上述问题,自主研发了三种不同类型的高恒阻 大变形锚索(NPR锚索),其核心结构由恒阻装置与传统锚索连接组成。 首先,通过现场静力拉伸试 验,得到该新型锚索结构最大恒阻力值约850kN,最大变形量达2000mm;其次,在ABAQUS中采用 STATIC,GENERAL准静态分析方法对静力拉伸条件下恒阻装置的应力应变特性进行数值模拟分析, 分析结果证明NPR锚索拉伸过程是一个恒阻且吸收能量的过程;最后,现场应用验证了NPR锚索结 构能够随着边坡失稳而产生大变形的特性,避免了传统锚索因大变形而被拉断破坏,实现了滑坡灾害 防治、监测、预报智能一体化的目标,为合理解释滑坡体运移规律与监测预警曲线之间的关系提供了科 学依据。
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| 关 键 词： | 恒阻大变形锚索 数值分析 负泊松比 静力拉伸 |
Research on mechanical property and engineering application of cable with high constant resistance and large deformation |
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| Affiliation: | StateKeyLaboratoryforGeomechanicsandDeepUndergroundEngineering,Beijing100083,China; 2.SchoolofMechanicsandCivilEngineering,ChinaUniversityofMining&Technology-Beijing,Beijing100083,China; 3.NanfenOpen-pitIronMineBenxiIronandSteelGroup,BenxiLiaoning117000,China |
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| Abstract: | Inrecentyears,theintensityandfrequencyoflandslidegeologicaldisastershavebeenincreasing yearbyyear.Intheprocessoflandslideoccurrence,thetraditionalprestressedanchorcablecannotresist thelargedeformationofrockandcauseproblemssuchasbreakingandfailure.Inresponsetotheabove problems,threedifferenttypesofhigh-resistancelargedeformationanchorcables(NPRanchorcables)have beenindependentlydeveloped.Itscorestructureconsistsofaconstantresistancedeviceconnectedwitha traditionalanchorcable.Then,throughthefieldstatictensiletest,itisconfirmedthatthecablecanprovidea maximumworkingresistanceof850kNandalargedeformationof2000mm.Secondly,usingSTATICandGENERALquasi-staticanalysismethodinABAQUS,thenumericalsimulationanalysisofthestress-strain characteristicsoftheconstantresistancedeviceunderstatictensioniscarriedout.Theanalysisresultsprove that the NPR anchor cable stretching process is a process of constant resistance and energy absorption.Finally,throughfieldapplication,itisverifiedthattheNPRanchorcablestructurecanbedeformedgreatlywiththeinstabilityoftheslope,whichavoidsthetraditionalanchorcablebeingbrokendueto largedeformation.Itachievesthegoalofintelligentintegrationoflandslidehazardprevention,monitoringand forecastingandprovidesascientificbasisforreasonablyexplainingtherelationshipbetweenthelawoflandslidemigrationandthemonitoringandearlywarningcurve. |
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