福堂水电站震后厂房边坡锚索加固及应力监测与分析
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摘要
"5·12"汶川大地震后,震区边坡稳定性受到严重破坏,出现多种破坏形式,如崩塌、滑坡、变形等等。不稳定边坡存在巨大的安全隐患,所以对边坡进行加固势在必行。预应力锚索是高边坡危害防治的主要手段,将大吨位的预应力锚索锚固于边坡体内稳固的岩层中,通过施加预应力,可抵抗边坡体深层破坏和变形。锚索预应力变化监测对于岩土锚固工程具有重要意义,它通过监控施工过程中及工后的预应力状态,检验加固工程是否达到预期效果,根据长期的监测结果对坡体稳定状态做出评价,并决定是否需要采取适当的补救措施。结合福堂水电站震后厂房边坡锚索加固及其应力监测,探讨了压力分散型锚索应力损失及变化规律,对岩土锚固工程设计、施工提供技术支持。
After 5·12 earthquake in Wenchuan,the slope stability has been severely damaged in earthquake area,many destroyed modes appeared,such as collapse,landslide,deformation,and so on. Pre-stressed anchor cable is the main method of preventing high slope harm,with large tonnage pre-stressed cable anchoring in stable rocks of slope to resist the deep slope failure and deformation by pre-stressing. It is important to monitor the pre-stress variation,through the prestressed state monitoring both in and after construction process,the reinforcement effects can be tested and based on the long-term monitoring results to evaluate the slope stability state,whether to take appropriate remedial measures can be decided. According to the slope anchor cable reinforcement of Futang hydropower station after earthquake and the stress monitoring,the paper discusses the stress loss of pressure-dispersive anchor and the variation rule.
After 5·12 earthquake in Wenchuan,the slope stability has been severely damaged in earthquake area,many destroyed modes appeared,such as collapse,landslide,deformation,and so on. Pre-stressed anchor cable is the main method of preventing high slope harm,with large tonnage pre-stressed cable anchoring in stable rocks of slope to resist the deep slope failure and deformation by pre-stressing. It is important to monitor the pre-stress variation,through the prestressed state monitoring both in and after construction process,the reinforcement effects can be tested and based on the long-term monitoring results to evaluate the slope stability state,whether to take appropriate remedial measures can be decided. According to the slope anchor cable reinforcement of Futang hydropower station after earthquake and the stress monitoring,the paper discusses the stress loss of pressure-dispersive anchor and the variation rule.
引文
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[2]谭建国,祁志强,曹继军.三峡库区地质灾害治理中预应力锚索施工的技术难点与对策[J].探矿工程(岩土钻掘工程),2005,32(S1):184-186.
[3]王清标,路林海,王立华.压力分散型预应力锚索在高边坡滑坡处理施工技术[J].预应力技术,2006,(6):20-24.
[4]巩玉志,武换娥,袁志国,等.深基坑桩锚支护结构锚索轴力监测分析[J].探矿工程(岩土钻掘工程),2012,39(10):66-68.
[5]王虎法.压力分散型锚索现场抗拔试验测试与分析[J].探矿工程(岩土钻掘工程),2007,(6):47-49.
[6]陈宾杰,张有为.高速公路边坡工程预应力损失探讨[J].西部探矿工程,2007,(10):197-199.
[7]袁培进,吴铭江,陆遐龄,等.长江三峡永久船闸高边坡预应力锚索监测[J].岩土力学,2003,24(S1):198-201.
[8]韩侃.公路高边坡预应力锚索加固监测及分析[J].西部探矿工程,2008,(11):46-49.
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