冰雪灾害条件下南方地区岩锚失效的机理研究

项目名称： 冰雪灾害条件下南方地区岩锚失效的机理研究

项目编号： No.41302232

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 天文学、地球科学

项目作者： 张伟丽

作者单位： 中国地质大学（武汉）

项目金额： 27万元

中文摘要： 在极端冰雪灾害条件下，冻融循环使锚固支护结构和边坡内部应力的平衡状态发生改变，支护结构力学性能劣化甚至失效，导致产生新的滑坡与崩塌，造成人民生命财产的重大损失。本项目拟综合运用模型实验、理论分析和数值模拟相结合的方法，对冰雪灾害气候下我国南方地区岩锚失效的机理进行研究。通过模型试验测定冻融循环过程中锚杆、砂浆-锚杆粘结面以及砂浆-围岩粘结面的应力变化情况；测定冻融循环前后锚杆锚固力的变化及预应力锚杆的预应力损失情况；研究冻融循环作用下岩锚粘结性能的退化机理，给出粘结退化的数学模型；分析冻融循环对锚杆支护结构耐久性的影响；建立温度场耦合应力场的锚杆支护结构的数值模型，研究冻融循环作用下锚固岩质边坡的稳定性。所得结论将为今后南方地区锚固支护结构的设计和施工提供理论依据，也为极端冰雪灾害条件下地质灾害防治标准及相关规范的建立提供参考，并为冻土区地质灾害防治标准及相关规范的补充和完善提供参考。

中文关键词： 注浆岩石锚杆；冻融循环；锚固力；力学性能；

英文摘要： Stress in anchor supporting structure and slope will be changed with extreme snow disasters, deterioration of mechanical properties of anchor supporting structure will occur with freeze-thaw cycles,even it can lead to landslide and collapse of slope and great damage to people's life and wealth. This project will study on the mechanism of mechanical properties of anchor supporting structure under extreme ice and snow disasters with laboratory model experiments, theoretical analysis and numerical simulation.In model experiments, stress in anchor, stress in cementation plane between anchor and anchor agent, stress in cementation plane between anchor agent and rock will be measured during freeze-thaw cycles. Anchor force and prestress loss in prestressed anchor also will be measured .The deterioration of bonding properties will be researched and a mathematical model of bond degradation will be given. The durability of grouted rock anchor with freeze-thaw cycles will be researched. The numerical model with temperature field and stress field will be built to analysis the stability of slope based on laboratory experiments. It will provide theoretical guidance for construct and design anchor supporting structure on rock slope in south China, and provide academic basis for the standards of prevention of geological disast

英文关键词： grouted rock bolt；freeze-thaw cycle；anchoring force；mechanical properties；