顺层边坡开挖变形破坏特征模型试验研究

Model Test Study on Deformation and Failure Characteristics of Bedding Slope Excavation

以辽宁一处公路开挖边坡为研究对象,在现场调查的基础上获取边坡的工程地质条件。以相似原理为基础,使用底摩擦试验对边坡开挖后的变形破坏特征进行研究。试验结果表明:该含软弱夹层的顺层边坡的变形破坏机制为由下及上的渐进整体性破坏,开挖出露的底层软弱夹层控制了斜坡的整体破坏范围,其上的软弱夹层控制了各岩层间的相互错动。顺层斜坡在开挖时需尽可能降低开挖高度,提前采取防治措施治理。

Taking a highway excavation slope in Liaoning Province as the research object, the engineering geological conditions of the slope were obtained on the basis of field investigation. Based on the similarity principle, the deformation and failure characteristics of slope after excavation are studied by bottom friction test. The test results show that the deformation and failure mechanism of the bedding slope with weak interlayer is progressive and integral failure from bottom to top. The excavated weak interlayer controls the whole failure range of the slope, and the weak interlayer above controls the mutual dislocation of the rock layers. In order to reduce the excavation height, we should take preventive measures to control the consequent slope.