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运用黏着摩擦理论,分析结构面直剪过程中实际剪切面积的变化规律及其对剪切应力的影响,认为实际接触面积的最大点对应于结构面的剪切破坏状态,由此通过对试验过程的分析给出了剪切破坏的简易判别式,在此基础上提出抗剪强度选取的新方法。运用此方法对沪蓉西高速公路24标段岩体结构面的抗剪强度进行了选取,其选取结果与峰值强度折减后的结果比较接近,且该方法比峰值强度的折减系数选取更合理可靠。
Using the theory of adhesion friction, the change law of the actual shear area and its influence on the shear stress during the direct shear of the structural plane are analyzed. The maximum point of the actual contact area corresponds to the shear failure state of the structural plane, The analysis of the process gives a simple discriminant of shear failure, and on this basis proposes a new method for the selection of shear strength. Using this method, the shear strength of the rock mass structure section of the section 24 of Shanghai-Chengdu Expressway is selected. The results are close to those obtained after the reduction of peak intensity, and the method is more effective than the selection of the reduction coefficient of peak intensity Reasonable and reliable.