泥岩高边坡锚索预应力变化规律分析  

ANALYSIS OF PRESTRESS VARIATION OF CABLE IN MUDSTONE HIGH SLOPE REINFORCEMENT

作　　者：张永安[1] 李峰[1] 蒋鸥[2] 

机构地区：[1]昆明理工大学国土资源工程学院,云南昆明650093 [2]中国水电顾问集团昆明勘测设计研究院,云南昆明650041

出　　处：《岩石力学与工程学报》2007年第9期1888-1892,共5页Chinese Journal of Rock Mechanics and Engineering

摘　　要：通过对泥岩高边坡锚索预应力变化规律进行系统监测和资料分析,探讨泥岩高边坡锚索预应力的锁定损失,短、长期变化规律及降雨、补偿张拉对预应力的影响。锚索锁定时的预应力损失,主要是由于锚具回缩导致,平均预应力损失为12.8%。锁定后预应力的变化规律可分为3个阶段:第1阶段为锚索预应力的急速下降期,时间为15 d左右,预应力损失率约6.2%;第2阶段为缓慢下降期,持续约6个月,该段时间预应力损失率约8.1%;第3阶段为基本平稳期,锚索预应力基本平稳,仍然有所下降,但是下降的幅度已经很小。强降雨会使预应力有不同程度的增加,增加率为1.9%～3.1%。补偿张拉能明显提高锚索预应力,同时还可以减缓预应力损失的速率。Cable is widely used in slope reinforcement engineering; the rules of prestress change in cable are not studied thoroughly and systematically yet, especial the prestress loss after lock and the lasting prestress of cable in mudstone slopes. Based on the systematical monitoring and analysis in the slopes reinforcement project, the prestress loss after lock with short-term and long-term prestress change rules are studied： and also the influence of rainfall on the cable prestress state and the compensation method are monitored and discussed. It is found that the prestress loss after lock is about 12.8%; and the reason is anchorage circle caused by the retraction. After being locked, the prestress loss can be divided into three stages. The first stage lasts about a half month after being locked; but the prestress loss velocity is quickly, about 6.2% in 15 days. It is mainly caused by the creep of mudstone after the cable is locked. Then it becomes into a relatively slow stage： the prestress loss is about 8.1% and the time lasts for about 6 months. Finally, the pretress comes to a steady stage, in this stage the prestress loss is seldom seen but also can be influenced by rainfall etc.. The compensation method can raise the prestress for about 15.4% and also can reduce the lost ratio. By studying the rules of prestress changes in the mudstone slopes, the influencing factors and the compensation method are analyzed.

关 键 词：边坡工程 泥岩 边坡加固 锚索 预应力损失 

分 类 号：P642[天文地球—工程地质学]