高边坡锚索预应力变化规律浅析  

Analysis of Prestress Variation of Cable in High Slope Reinforcement

作　　者：何伟[1] 刘秀平[1] 游萍[1] 陈科文[1] 陈向浩[1] 

机构地区：[1]四川大学水利水电学院,成都610065

出　　处：《长江科学院院报》2009年第12期89-92,共4页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金项目(50639100);科技部国际科技合作项目(2007DFB60100)

摘　　要：通过对某水电站高边坡锚索预应力的系统监测和综合分析,讨论坡积层边坡中锚索预应力张拉、锁定中的损失及其变化规律的时间效应,探求预应力损失的主要影响因素,得到以下结论:①锚索锁定损失与张拉力有关,张拉荷载的规格越高,损失率越小;②锚索预应力损失分迅速下降、缓慢下降、相对稳定3个阶段;③坡积层中锚索预应力损失的主要影响因素是岩(土)体的蠕变,施工、环境因素的影响具有时效性;④本工程区监测数据验证了临时断面监测仪器布置的合理性。On the basis of the systematical monitoring and comprehensive analysis of the prestressed anchorage cable on the high slope of some hydropower station, the prestress loss during construction and after locking are studied, the relationship between the prestress loss and time is discussed, also the main influence factors of the cable prestress loss are researched. The conclusion is as follows： 1. The prestress loss is related with the tension stress. The stronger the force, the less the loss percentage; 2. After being locked, the prestress loss can be divided into three stages： speedy decline stage, slow decline stage and relatively stable stage; 3. The major factor that affects the prestress loss of cable in diluvium slope is the creep of the rock, the influences of construction and environment fac- tors possess time effect ; 4. According to the monitoring data, it is proved that the disposal of the apparatus on provisional monitor section is reasonable.

关 键 词：坡积层 边坡工程 边坡加固 锚索 预应力损失 

分 类 号：TV223[水利工程—水工结构工程]