近水平红层开挖边坡变形破坏特征

Distortion and failure character of excavation slope in approximate level red beds

通过对四川盆地近水平红层公路建设中路堑边坡开挖病害的调查分析,归纳出近水平红层边坡开挖引起的主要变形破坏型式是堆积层滑坡、顺层座滑型滑坡、边坡拉裂变形、边坡岩体倾倒破坏,总结了近水平红层边坡的主要工程地质特征,提出边坡变形破坏的过程一般经历开挖卸荷变形、陡倾节理发展扩大、变形破坏形成三个阶段,并结合工程实例分析了其形成机理。

By diagnosing the slope excavation diseases during the highway construction in Sichuan basin, the main distortions and failure types of slopes in approximate level red beds are concluded, which is accumulation formation landslide, bedding landslide, rip distortion of rock mass and rock mass collapse. The main geological character of slope in approximate level red beds is summed up; the three phases of slope distortion and failure, which is excavation load-off distortion, developing and widening of steep joint, distortion and failure come into being, are put forward. The failure mechanism is analyzed combined a project example.