特高拱坝基础倒垂线锚固深度研究

On the Anchor Point Depth of the Inverted Vertical Line Anchored in the Foundation in an Extra-high Arch Dam

垂线系统是特高拱坝水平位移监测中最可靠、精度最高的系统,基础倒垂线作为整条垂线组的基准,其测值可靠性将直接影响拱坝整体变形测值。文章在有限元计算的基础上,在白鹤滩特高拱坝基础布置不同深度锚固点的倒垂线,并结合蓄水期实测数据进行验证分析,研究经济、合理、技术可行的特高拱坝倒垂线锚固点深度,可供类似工程基础倒垂线锚固深度设计借鉴。

The vertical line system is the most reliable and accurate system for horizontal displacement monitoring of extra-high arch dams.The inverted vertical line anchored in the dam foundation serves as the benchmark for the whole vertical line system.Its measurement reliability will directly affect the overall deformation measurement of the arch dam.On the basis of finite element calculations,inverted vertical lines anchored at different anchor points with different depths are arranged in the foundation of Baihetan extra-high arch dam.Analysis is carried out based on the measured data during the water storage period.The economic,reasonable and technically feasible anchor point depth of the inverted vertical line for extra-high arch dams is obtained.The result provides useful reference for the design of the anchor point depth of inverted vertical lines in similar projects.