高恒阻大变形锚索静力学特性数值模拟分析及应用

陶志刚; 李梦楠; 庞仕辉; 谷明; 何满潮

高恒阻大变形锚索静力学特性数值模拟分析及应用

Research on mechanical property and engineering application of cable with high constant resistance and large deformation

摘要

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。

Abstract: Inrecentyears,theintensityandfrequencyoflandslidegeologicaldisastershavebeenincreasing yearbyyear.Intheprocessoflandslideoccurrence,thetraditionalprestressedanchorcablecannotresist thelargedeformationofrockandcauseproblemssuchasbreakingandfailure.Inresponsetotheabove problems,threedifferenttypesofhigh-resistancelargedeformationanchorcables(NPRanchorcables)have beenindependentlydeveloped.Itscorestructureconsistsofaconstantresistancedeviceconnectedwitha traditionalanchorcable.Then,throughthefieldstatictensiletest,itisconfirmedthatthecablecanprovidea maximumworkingresistanceof850kNandalargedeformationof2000mm.Secondly,usingSTATICand
GENERALquasi-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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