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泥化夹层作为最常见的次生型软弱夹层,抗剪强度指标极低,常常是导致斜坡失稳的主控因素,泥化夹层强度参数对合理进行边坡稳定性分析至关重要。采用常规的直剪试验或三轴试验测试泥化夹层剪切强度参数均存在一定缺陷且可能导致测试结果失真。在泥化夹层应变破坏准则的基础上,通过无侧限压缩试验,结合ARAMIS数字散斑监测压缩过程中剪切带形成、发展和变化及压缩破坏后破坏面与水平面的夹角α,并基于土体极限平衡理论提出了一套对泥化夹层剪切强度参数试验预测的新方法。
As the most common secondary soft interlayer, mudstone interbed is extremely low and often the main controlling factor causing slope instability. The strength parameters of muddy interlayers are very important for the reasonable slope stability analysis. Using conventional direct shear test or triaxial test to test the shear strength parameters of the masonry has some defects and may lead to distortion of the test results. Based on the criterion of strain failure in muddy intercalation, through the unconfined compressive test, combined with ARAMIS digital speckle monitoring, the formation, development and variation of shear band during compression and the angle α between failure plane and horizontal plane after compression failure are analyzed. Soil limit equilibrium theory presents a new method for predicting the shear strength parameters of muddy interlayers.