热害隧道全长粘结式锚杆力学性能及损伤机理研究

项目名称： 热害隧道全长粘结式锚杆力学性能及损伤机理研究

项目编号： No.51308471

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 建筑科学

项目作者： 李福海

作者单位： 西南交通大学

项目金额： 25万元

中文摘要： 锚杆支护是保证隧道围岩稳定的一种有效支护方式，其锚固体系本身的性能、灌浆料与围岩基体之间的粘结性能是关系到支护结构作用能否很好发挥的关键问题。随着隧道建设逐渐向长大深埋方向发展，热害（高地温）问题日渐突出，在湿（干）热环境下，灌浆料的物理性能指标、灌浆料与锚杆（第一界面）及灌浆料与围岩（第二界面）的粘结性能都会发生较大的变化，可能出现强度倒缩加剧、系统体积稳定性变差以及第一、第二界面粘结力严重损失，甚至脱粘开裂丧失支护作用。本项目通过材料组配性能试验、模拟环境试验和数值方法及微观测试技术研究揭示不同高地温情况下灌浆料物理性能、第一界面及第二界面粘结力学性能的变化规律，热微观结构及界面过渡区作用机理。建立高地温情况下第一界面及第二界面粘结力学模型及脱粘损伤判据。分析热害对灌浆料微观结构和宏观性能的影响，提出有效的热害情况下灌浆料及锚杆的合理组成材料和施工措施，以保证围岩支护安全及长期稳定。

中文关键词： 全长粘结式锚杆；高地热；粘结强度；围岩粗糙度；损伤

英文摘要： Bolting is a kind of effective method of ensuring tunel adjacent rock stability. The property of bolt system and bond property between grouting material and adjacent rock are key issues about supporting structure. Heat-harm becomes more extrusive as turnal construction towards long,wide and deep. Physical properties of grouting material, bond properties between grounting material and bolt, adjacent rock will occur larger changes. Intensity may significantiy reduced and system volume stability become poor in the hygrothermal (hotdry) environment. Binding power of first interface and second interface will also deteriorate seriously. Some may debond or crack and lose its support function. The experiments of matching property of materials , environment simulation, numerical simulation and microscopic test technology will be carried out in the project. The changing regularity of physical propertyes of grounting material and bond property of first interface and second interface, hot microstructure, interface transition zone mechanism will be research and revealed in thedifferent high geotherm environment. The bond mechanics model and debond deterioration criteria of first interface and second interface will be setted up. The influences of heat-harm to grounting material microstructure and macroscopic properties will

英文关键词： Wholly grouted rock bolt；high geothermal；bond strength；surrounding rock roughness；deterioration