岩溶区某堆石混凝土重力坝基础处理设计

Design of Foundation Treatment for a Rockfill Concrete Gravity Dam in Karst Area

某堆石混凝土重力坝最大坝高44m,基础为灰质白云岩,沙化严重,溶槽发育较多,地质情况复杂。根据现场实际情况,在抗滑稳定分析基础上,针对性的提出溶槽部分回填大级配C15微膨胀混凝土,沙化严重坝段通过基础垫层混凝土配置钢筋及增设锚筋桩等方式避免大坝不均匀沉降,增加大坝稳定安全保证。通过多种措施并举,实现岩溶沙化严重地区重力坝稳定布置。

The maximum dam height of a rockfill concrete gravity dam is 44m,and its foundation is lime dolomite,with serious desertification,large number of dissolution channels and complex geological conditions.According to the actual situation on site,based on the analysis of stability against sliding,this paper proposes to backfill large-scale C15 micro-expansion concrete in the solution tank.Severe desertification dam section avoids uneven settlement of dam and increases safety guarantee of dam stability by configuring reinforced bar in foundation cushion concrete and adding anchor bar piles.The stable layout of gravity dams in areas with severe karst desertification has been achieved by combining various measures.