中文摘要：

根据剪切方向与制样误差角的相对位置关系，完善结构面抗剪强度参数理论解析修正公式的推导过程，采用数值试验方法验证结构面制样误差效应；依据直剪试验原理和概化模型提出的抗剪强度参数修正方法，通过室内结构面模型试验验证制样误差效应及理论解析修正方法和数值试验的研究成果。研究结果表明：结构面制样误差的几何形态由爬坡角α和偏角β所控制，抗剪强度参数c和φ对爬坡角α敏感，偏角β影响甚小；在正滑向条件下，结构面抗剪强度参数随着α增大而减小，随偏角β的增大而增大；在逆滑向条件下，试验结果与正滑向变化趋势相反。抗剪强度参数随误差角变化的趋势与理论解析修正方法规律一致，这比基于单元微截面的空间应力状态推导得到的理论解析修正公式更符合工程实际。制样误差效应是造成直剪试验结果失真的重要因素，需根据结构面真实受力状态对试验结果进行修正。

英文摘要：

On the basis of the relative positions of direct shear test shear direction and sample error angle, the improved deducing processes of shear strength parameters correction formula were presented. The numerical test results validated the effect of sample preparation errors. Finally, the influences of a and β on the direct shear test were respectively analyzed through the rock mass discontinuities model test. The geometrical form of rock mass discontinuities sample error angle can be determined by climbing angle a and deflection angle ft. Shear strength parameters of rock mass discontinuities are sensitive to a, but not sensitive to ft. Under normal sliding direction, shear strength parameters increase with a, while they decrease with the increase of β. This changing trend of the parameters is opposite under reverse sliding direction. The tendency of shear strength parameters of rock mass discontinuities is similar to the theoretical error angle correction method. The parameters correction method, based on the principle of direct shear and ideal generalized model is more consistent with engineering application than that of the theoretical formula according to stress correction of unit micro-section. The result of model test is similar to that of theoretical correction method and numerical test, which also verifies the effect of sample preparation errors. The synthetic analysis results indicate that the effect of sample preparation error has a remarkable influence on direct shear test results, so the experiment results must be corrected.