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3D Geomechanical Model Test on Global Stability of Lizhou RCC Arch Dam on Muli River

机译：木里河River州碾压混凝土拱坝整体稳定性的3D地质力学模型试验

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摘要

Lizhou Hydropower Station is located on the Muli River,a large branch of the Yalong River.The double-curvature RCC arch dam is 132 m high which is the world-class high RCC arch dam.At the dam site,the river valley is narrow and steep with suitable topographic condition for constructing high arch dam.While some weak structural planes including faults,interlayer shear zones and fissure zones and large fissures,are developed in both abutments and affect the global stability of dam and foundation.It is necessary to be studied about this engineering issue.A 3D geomechanical model test is presented in this paper to simulate these adverse geological structures and analyze their negative impacts on stability.Through the overloading destructive experiment,the deformation characters,failure pattern and mechanism of dam,rocks and structure planes in abutment are obtained.The controlling factors and the weak regions impact the stability are revealed.And the overloading safety coefficients of dam and abutment at different destructive stages are determined as follows: K1 =1.4 ～ 2.2,K2 =3.4 ～ 4.3,K3 =6.3 ～ 6.6.The stability of dam and abutment is evaluated.Furthermore,some reinforcement measures for the weakness of dam abutment are advised.
机译：zhou州水电站位于雅long江大支流木里河上，双曲RCC拱坝高132 m，是世界一流的RCC拱坝。在坝址，河谷狭窄陡峭且具有合适地形条件的高拱拱坝。尽管两个断层，断层，层间剪切带，裂隙带和大裂隙等较弱的结构面均发育，并影响了大坝和地基的整体稳定性。针对这一工程问题，本文进行了3D地质力学模型试验，以模拟这些不利的地质构造并分析其对稳定性的不利影响。揭示了基台的平面，揭示了影响稳定的控制因素和薄弱区域，以及坝a的超载安全系数。确定不同破坏阶段的基台如下：K1 = 1.4〜2.2，K2 = 3.4〜4.3，K3 = 6.3〜6.6。评估了坝基和基台的稳定性。建议。

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