立洲水电站是木里河干流水电规划的重要梯级电站，该工程的大坝为碾压混凝土双曲拱坝，最大坝高132 m，坝址区地质条件较为复杂。为了研究该拱坝与地基的整体稳定问题，采用了三维地质力学模型超载法试验，在模型中充分反映断层、层间剪切带、长大裂隙及裂隙带等复杂地质构造对坝与地基整体稳定的影响，，而且在试验过程中将光纤光栅传感器布置在坝顶及上游坝面，监测坝体超载过程中的应变，从而分析坝体的开裂破坏过程。试验研究获得了坝肩抗力体变位分布特征，确定了拱坝与地基的超载安全系数和坝肩破坏形态，为工程的设计和施工提供了科学依据。

Lizhou hydropower station is an important cascade hydropower station located in the Muli River. The project adopts a roller compacted concrete (RCC) arch dam, and the maximum height of the dam is 132 m. The geological conditions in the dam area are very complex, therefore, the overload method of three-dimensional geo-mechanical model test was used to characterize the effects of the complex geological structures such as the faults, interbedded shear zone, large fissure, and fissure zone on the overall stability of dam and foundation. The optical fiber grating sensor was placed at the dam top and upstream dam surface to monitor the deformation of the dam under the overloading process, which can be used to analyze cracking destruction process of the arch dam. Through experimental study, the distribution characteristics of displacement of the dam abutment were identified, the overloading safety factors of dam and foundation were determined, and the failure modes of dam abutment were obtained. The results could provide scientific basis for Eengineering design and construction.

国家自然科学基金资助项目(51109152；50879050)；国家重点基础研究发展计划(973)项目(2010CB226802)；博士学科点专项科研基金（20100181110077）