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。
Abstract:
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 pre-stressed 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 de-cided.According to the slope anchor cable reinforcement of Futang hydropower station after earthquake and the stress moni-toring, the paper discusses the stress loss of pressure-dispersive anchor and the variation rule.
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