滑坡治理中预应力锚索格构梁受力分析

Analysis on Prestressed Cable Lattice Beam of Landside Control in Taijitoudong Slope of the Three Gorges Reservoir Region

三峡工程库区巴东太矶头东滑坡是松散堆积体滑坡 ,采用格构锚固结构进行治理 ,格构梁按照Winkler弹性地基上的梁进行分析 ,并与三维格构锚固模拟的结果对比 ,对格构梁的设计提出建议 ,建议梁长与弹性特征λ满足 lλ≥ 2π,间距 ls满足 lsλ<π/2 ,同时采用较小间距的格构梁以及小吨位锚索 ,悬臂长度取 0 .3～0 .5 ls,建议设计时弯矩乘以系数 K=1.3。

Taijitoudong slope in Badong County of the Three Gorges reservoir region is a loosen body landslide,so lattice frame anchor structure is applied to its control project design.Prestressed cable lattice beam is studied by analytic solution of the beam on Winkler elastic foundation quantificationally and its analytic solution is compared with 3D FEM solution.Lattice beam is affected by the elastic characteristic λ ,space between beams l s and cantilever length.Lattice beam should be a long continuous beam and lλ ≥2π Space between beams should be short and l sλ< π/2 Cantilever length relates to space between beams,but not to λ The suggestion is that cantilever length is 0 3～0 5 l s