锚固系统与锚固介质材料中应力波波速的关系  

Relationships between Stress Wave Velocities in Anchorage System and Material of Anchorage Medium

作　　者：孙冰[1] 曾晟[1] 丁德馨[1,2] 綦春明[1] 郑绪涛[1] 

机构地区：[1]南华大学城市建设学院,湖南衡阳421001 [2]中南大学资源与安全工程学院,长沙410083

出　　处：《防灾减灾工程学报》2013年第3期305-310,共6页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(51204098);湖南省自然科学基金项目(11JJ6045);南华大学"十二五"创新团队项目(2012NHTD12)资助

摘　　要：应用低应变反射波法对锚杆锚固系统进行无损检测时,常因锚杆底端反射很微弱而影响锚固系统中应力波波速的准确确定,导致锚固质量无法准确判读,为此,采用低应变反射波法测试了不同围岩和锚固介质中的锚固系统应力波波速,并与采用超声波法测试的由锚固介质材料所制作标准试块中的应力波波速进行对比分析。结果表明,这2种波速与锚固介质材料强度密切相关;锚固系统中的应力波波速介于锚固介质材料与自由锚杆中的应力波波速之间,锚固系统中的应力波波速和锚杆介质材料中的应力波波速随龄期和强度均呈指数关系变化且对称分布。The reflected wave method is used to evaluate the integrity of the anchorage system, and the stress wave velocity in anchorage system is the most basic parameter. However, it is very difficult to measure the parameter since it is affected by many factors. Based on the reflected wave method with low strain, the transient dynamic response of anchorage systems with different anchorage medium and surrounding rock were conducted and the stress wave velocity in anchorage system was obtained, and the stress wave velocity in the material of anchorage medium was obtained with ultrasonic method. The results show： （1） both kinds of wave velocity are related to the strength of the anchorage medium; （2） the stress wave velocity in anchorage system ranges from which in the material of anchorage medium to in free steel bar; （3） both kinds of wave velocity vary in exponential law; （4） they are mutually symmetric with a certain wave velocity. This provides a new idea for the solution to the stress wave velocity in anchorage system.

关 键 词：岩土工程 锚固系统 锚固介质 应力波波速 

分 类 号：TU757.2[建筑科学—建筑技术科学]