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重力坝基础水平位移的测定方法是沿基础纵向廊道两端和中间布置倒垂线,其锚块埋入基础以下40～60m。以倒垂线为起始点布设引张线。为了研究坝基面下部岩体的变位,在基础的不同深度埋设接近基面及基面以下较深处的倒垂线组,每组包括2～4条垂线。拱坝基础的水平位移由敷设在坝体和两岸灌浆廊道内的导线来测定。导线控制点布置在灌浆廊道
The method of determining the horizontal displacement of gravity dam foundation is to arrange the vertical line along both ends and the middle of the longitudinal corridor of the foundation, and its anchor block is buried 40 ~ 60m below the foundation. The inverted vertical line as the starting point of laying lead line. In order to study the displacement of the rock mass in the lower part of the dam basement, the inverted vertical line group, which is deeper than the base surface and the base surface, is buried at different depths of the foundation, and each set includes 2 to 4 vertical lines. The horizontal displacement of arch dam foundation is determined by the wires laid in the dam body and the cross-strait grouting corridor. Wire control points arranged in the grouting corridor