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三河口水利枢纽工程是引汉济渭工程两大水源工程之一,岩体抗剪强度特征是边坡岩体主要岩体力学问题之一。为研究边坡岩体抗剪强度特征,在坝肩边坡针对不同岩性不同风化程度岩体开展多组原位直剪试验,试验应力与拱坝实际受力状态相同。通过综合分析7组岩体直剪试验和7组岩体/混凝土接触面直剪试验成果,获得不同岩体抗剪强度参数变化范围,研究了试验成果的影响因素、直剪试验破坏特征,最后对比混凝土/岩接触面直剪试验与岩体直剪试验成果及破坏特征。
The Sanhekou hydro-junction project is one of the two major water sources projects leading to the Hanjiwei Project. The shear strength characteristics of the rock mass are one of the main mechanical problems of rock mass. In order to study the characteristics of shear strength of slope rock mass, multiple sets of in situ direct shear tests are conducted on rock slopes of different lithologies and different degrees of weathering on the abutment slope. The experimental stress is the same as the actual stress state of arch dam. By comprehensively analyzing the direct shear tests of seven groups of rock mass and the direct shear test results of seven groups of rock mass / concrete contact surface, the range of shear strength parameters of different rock mass is obtained, the influencing factors of the test results and the failure characteristics of the direct shear test are studied, and finally Contrasting between the direct shear test of concrete / rock contact surface and the direct shear test results and failure characteristics of rock mass.