边坡预锚抗剪力学效应与延寿服役技术研究  

Study on mechanical effect of shear resistance and technology of life extension of prestressed anchor cables in slopes

作　　者：汪小刚[1] WANG Xiaogang(State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin,China Institute of Water Resources and Hydropower Research,Beijing 100038,China)

机构地区：[1]中国水利水电科学研究院流域水循环模拟与调控国家重点实验室,北京100038

出　　处：《岩石力学与工程学报》2023年第10期2341-2357,共17页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家重点研发计划项目(2018YFC0407000);中国长江三峡集团有限公司科研项目(JG/19055J);华能集团科技项目(HNKJ19–H14)。

摘　　要：围绕边坡锚固工程中“如何准确分析锚索抗剪效应、如何定量预测锚索使用寿命、如何有效延长锚索服役年限”三个关键难题,通过室内试验、数值模拟和理论分析,揭示锚索抗剪力学机制,建立基于三阶段变形破坏模式可全面反映预应力锚索抗剪作用的力学模型;基于锚索现场开挖检测成果及2160组锚索全浸、电解加速和干湿循环拟环境腐蚀试验,揭示锚索腐蚀机制和演化规律,提出考虑锚索健康状态的三阶段寿命划分方式,建立锚索性能衰变模型和寿命预测方法;通过对锚索防护结构体系的分析研究,提出“薄弱部位强化防护、超限应力动态调控、全程变形实时监测”的新理念,发明薄弱部位强化防护结构,研制超限应力动态调控专用装置,研发分布式应力变形实时监控和缺陷检测设备和技术,形成从结构措施、专用装置到监测设备的延寿服役成套技术。Focusing on the three key problems of how to comprehensively consider the shear resistance of anchor cables,how to quantitatively predict the service life of anchor cables and how to effectively extend the service life of anchor cables in the slope engineering,the mechanical mechanism of shear resistance of anchor cables in slopes was revealed through laboratory test,numerical simulation and theoretical analysis.Based on the three-phase deformation and failure mode,a mechanical model which can fully reflect the shear resistance effect of prestressed anchor cables was established.According to the results of in-situ exhumation and 2160 sets of corrosion tests,including immersion,electrolytic and dry-wet cycle corrosion tests,the corrosion mechanism and evolution law of anchor cables were revealed.A three-stage service life model considering the health status of anchor cables was proposed,and the performance deterioration model and life prediction method of anchor cables were established.To solve the problem of insufficient protective measures for anchor cables,a strengthened protective structure for weak parts was invented,a special device for dynamic control of stress over the limit was developed,and a distributed stress-deformation real-time monitoring and defect detection equipment were exploited.Thus,a complete set of life extension technology including structural measures,special devices and monitoring equipment was established.

关 键 词：边坡工程 预应力锚索 抗剪力学模型 寿命预测方法 延寿服役技术 

分 类 号：P642[天文地球—工程地质学]