松散破碎岩体锚固与监测技术应用研究

Research on Anchoring and Monitoring Technology Applied to Loose and Fractured Rock Mass

松散破碎岩体质量差、变形大、强度低,其加固技术难度大。合理有效的锚固技术是保证松散破碎岩体锚固效果的关键,采用压力分散型预应力锚索锚固因具有诸多优点而成为加固松散破碎岩体的有效技术。针对浙江金丽温(金华—丽水—温州)高速公路K81段边坡特点,综合考虑多种因素对支护设计方案进行优化,探索压力分散型锚索现场施工关键技术(如锚固力短期损失控制技术、补偿张拉控制技术和初始锁定值大小控制技术等)。现场监测数据表明,优化后方案可改善锚固效果,增强边坡稳定性。

It is difficult to reinforce loose and fractured rock mass due to the poor quality,large deformation and low strength.Therefore,the key to ensure rock anchoring effect is efficient anchoring technologies of which the pressure dispersion-type pre-stressed anchor cable is the proper one.According to the slope characteristics for K81 in Jinhua-Lishui-Wenzhou Expressway in Zhejiang Province,the supporting design scheme is optimized through consideration of various factors and the construction key technologies of the pressure dispersion-type pre-stressed anchor cable such as anchoring force short-term loss controlling technology,compensation tension controlling technology and initial lock value controlling technology,are explored.Field monitoring data shows that the optimized scheme can improve the anchoring effect and enhance the stability of the slope.