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采用堆载法进行天然状态与饱和状态下强风化角岩边坡岩体的现场直接剪切试验,获得不同正应力水平下剪切应力-剪切变形关系曲线和剪切强度参数,对其剪切应力-剪切变形关系曲线特征和不同正应力作用下剪应力随正应力的变化规律以及水-力耦合作用对剪切强度与变形特性影响进行了分析。试验结果表明:岩体峰值剪切强度和屈服剪切强度均随正应力的增大而增大;天然状态和饱水状态下剪应力随不同正应力的变化趋势基本相同;岩体剪切强度随含水率的增大而减小,在低法向应力下尤其敏感;水对岩体强度参数中黏聚力c的弱化作用更加明显,同时加大了岩体变形量,延长了岩体变形过程;通过现场直剪试验测得的法向变形可以估算岩体的压缩模量,为边坡稳定性分析提供参数。
The shearing method was used to carry out direct on-site shear tests of rock masses with strong weathering angle rock under natural and saturated conditions. The shear stress-shear deformation curves and shear strength parameters under different normal stress levels were obtained. The relationship between shear stress and shear deformation curve and the influence of different normal stresses on the shear strength and deformation characteristics of shear stress under normal pressure and water-force coupling are analyzed. The experimental results show that both the peak shear strength and the yield strength of rock mass increase with the increase of normal stress. The change trend of shear stress with different normal stresses is basically the same under natural and saturated conditions. The shear strength of rock mass It decreases with the increase of water cut and is particularly sensitive to low normal stress. Water softens the cohesion c in the strength parameters of rock mass more obviously, increases the deformation of rock mass and prolongs the deformation of rock mass The compressive modulus of the rock mass can be estimated by the normal deformation measured by the direct shear test in the field to provide parameters for the slope stability analysis.