(1. College of Water Resources and Hydropower，Sichuan University，Chengdu，Sichuan 610065，China；
2. State Key Laboratory of Hydraulics and Mountain River Engineering，Sichuan University，Chengdu，Sichuan 610065，China)
Abstract：The global stability of Lizhou arch dam is studied by overloading model test in the 3D geomechanical model，the complex geological structures including faults，interlayer shear zones，fissure zones and large fissures affecting the global stability are considered and simulated. Through the overloading destructive test，the deformation characters，the failure process，pattern and mechanism of dam，rocks and structure planes in foundation and abutment are obtained. The controlling factors and weak regions impacting the stability are revealed. And the overloading safety factors of dam and foundation at each destructive stage are determined as follows：the crack initiation overloading factor K1 = 1.4–2.2，the nonlinear deformation overloading factor K2 = 3.4–4.3，the ultimate overloading factor K3 = 6.3–6.6. Furthermore，comparing with other similar projects，the safety factor of Lizhou dam is within the statistical range of overloading test safety factors. While local parts of rocks and structure planes in middle and upper abutments are damaged seriously，their reinforcements should be paid more attention to improve the global stability of Lizhou arch dam.
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2012, Vol. 31 
