小湾拱坝坝肩稳定平面地质力学模型试验研究

小湾水电站是澜沧江中下游河段梯级开发的“龙头”水库,大坝为292 m高的双曲拱坝,坝址具备修建高拱坝的优越地形条件,但地质条件较为复杂。针对小湾拱坝1210 m高程坝肩的地形地质条件,对坝肩未进行加固处理方案,采用地质力学模型试验方法,抓住影响坝肩稳定的主要因素,利用超载法进行破坏试验研究,分析坝体及坝肩变形分布特征,探讨坝肩失稳的破坏过程、破坏形态和破坏机理,确定坝肩超载稳定安全度。

Geo-mechanical Model Test and Study of Xiaowan Arch dam Abutment Stability

The Xiaowan reservoir plays a leading role in developing of cascade hydropower plants in the middle and lower reaches of the Lancang river,and the Xiaowan dam is a double-curvature arch dam,292m high.The dam site is topographically suitable for constructing a high arch dam,however its geological conditions are rather complicated.According to the topographical and geological conditions of the Xiaowan arch dam abutments located at EL.1,210m the geo-mechanic model test method has been used,taking into account the major factors which have impacts on the abutment stability.The overloading method has been used to carry out failure test and study,analyze deformation distribution characteristics of both dam body and abutments,study process,pattern and mechanism of failure,which might make the abutments unstable,and finally determine the stability of the abutments under overloading condition.