清江隔河岩大坝重(推)力墩设计

Gravity abutment design for Geheyan dam on Qingjiang river

隔河岩大坝为上重下拱坝型 ,因受坝址左岸地形与地质构造缺陷的限制 ,为不使拱推力影响垂直升船机与闸首 ,设计中采用了设置重力墩 (2 3～2 6号坝段 )承力的方案。重力墩顺轴线长 80～ 87m ,沿轴线深 74.36～85 .81m ,每坝段场设纵缝 ,灌浆至 150m高程时与拱坝连成整体 ,以承受拱推力并作挡水坝段。相应的设计研究分析了抗滑稳定性、重力墩在整体结构中的受力状态 ,并利用加固后的地质力学模型模拟了重力墩的承载情况。重力墩结构分析表明 ,设计研究成果是安全可靠的 ,并经过 1998年大洪水的考验 。

The dam of Geheyan hydropoject is of a gravity type in the upper part,and of an arch type in the lower part.As the limitation of topography and geologic structure defect of left bank,and for the purpose of eliminating the influence of arch thrust on the vertical shiplift and gate bay,gravity abutments (No.23～No.26 monoliths) are adopted.The gravity abutments are 80～87 m long in the direction of dam axis and 74.36～85.81 m high,with longitudinal joint grouted to 150 m elevation,integrating with the arch dam for bearing the thrust action and retaining water.The stability against sliding and the stressing state of gravity abutment were analyzed and simulated with geomechanical model.The analysis demonstrates that the design is safe and reliable.The 1998 flood-test to the dam demonstrates the integral structure design of the dam with gravity abutments is rational.