滑坡钢筋砼格构防治“倒梁法”内力计算研究

Internal force analysis on steel concrete lattice by reverse beam method for landslide control

格构锚固技术能有效地控制滑坡深部和浅表破坏,提高锚固体系的整体刚度。目前在格构+锚杆体系的设计中,大多采用经验设计钢筋砼格构,常导致配筋不合理,不仅造成浪费,而且可能埋下工程隐患。本文采用“倒梁法”对格构梁的内力计算方法进行研究,对滑坡防护钢筋格构进行如下简化:(1)锚杆对格构梁的作用以垂向力为主,轴向力可以忽略不计。(2)纵向格构梁的刚度大于横向格构梁的刚度,因而横向格构梁的内力计算可以简化,钢筋砼格构可以作为在锚杆施力下的超静定连续梁。结合三峡工程库区巫山新城秀峰寺滑坡格构防护工程设计,通过“三弯矩方程”进行了格构梁内力实例计算,为格构梁的合理设计提供了依据。

Lattice beam with anchor has been widely applied to landslide control since the technique is effective to prevent the deep and subsurface landslide failure, and prettify the environment. But design method is mainly based on experience, which may bring material waste and hidden trouble for the internal force analysis fault. The reverse beam method is discussed on internal force analysis on steel concrete lattice for landslide control in the paper. Following conditions are simplified： （1） the anchoring force is vertical with lattice beam and axis force is neglect. （2） the stiffness of longitude beam is greater than that of latitude, so the internal force analysis is based on exceeding static determinacy continuous beam. The method is applied to Xiufengsi landslide stabilization at the Three Gorges Reservoir.