坡面形态对边坡动力变形破坏影响的模型试验研究

采用自主制作的单向振动试验台,对不同坡面形态土质边坡进行了失稳破坏过程的模型试验研究。试验设计了凹面坡、凸面坡和凹凸面组合型3类边坡共8个模型,通过单向振动试验台施加初始位移,触发模型边坡失稳破坏,利用摄像机对模型边坡破坏过程进行跟踪记录,并对变形破坏特征进行分析。试验表明:凹面坡主要由坡面上形成的横向裂隙带动整个坡体发生破坏,而凸面坡则是由于坡顶上形成的横向裂隙带动整个坡体发生变形破坏,凹凸面组合型边坡的破坏则是受坡面凸起部位所控制;进一步研究发现,凹凸程度越强的边坡越容易发生变形破坏,其变形破坏的程度越大。研究成果有助于了解不同形态坡面边坡的破坏特征,为工程边坡设计提供借鉴意义。

Model test of influence of slope surface morphology on dynamic deformation failure

A model test performs to study the failure progress of different slopes morphology soil slope by a self-made one-way vibration test-bed. The test includes eight test models and three patterns of slope (concave slope、convex slope and combination of concave and convex slope), The failure of slope is induced by applied initial displacement with the vibration test-bed and the failure progress is recorded with camera, slope models deformation and failure characteristics are summarized and analyzed. The result shows that the concave slope failure reason is slope surface formation of transverse crack drive the whole slope destroyed, convex slope failure is due to the slope top formation of transverse crack drive the whole slope destroyed, combination of concave and convex slope failure by the raised portion of slope surface control. Further studies proves that the more intense the degree of the concave and convex parts is, the more strong the slope damage is. The study results are useful to understand better the progresses and forms of soil slope failures with different surface morphologies and provide a scientific basis for treatment of engineering slope.