拉剪型危岩发育过程的模型试验

Testing Research on Development of Perilous Rock in Tension-shear Fracture

拉张破坏和剪切破坏是拉剪型危岩发育的主要力学机理,基于平面应变假定,文通过室内模型试验对拉剪型危岩发育过程进行了试验研究,得到了该类危岩在荷载作用下的损伤断裂破坏是从陡崖脚部逐渐向陡崖顶部发育,危岩失稳破坏具有突发性,主控结构面在受荷初期表现为拉张破坏,当主控结构面端部扩展至距离危岩体底部一定距离后主控结构面的破坏型式表现为剪切破坏等结论,为深入进行危岩发育机理研究提供了重要的试验依据.

Both tension fracture and shear fracture is the dominant mechanic mechanism for perilous rock in tension-shear fracture to rupture. On the basis of assumption of plane strain, the authors make testing research on development process of perilous rock in tension-shear fracture through model testing in laboratory. Some important results are as following： Damage and fracture of the perilous rock under action of loads is developing gradually from foot area to top area of cliff. Perilous and fracture of the perilous rock is in abruption. Control fissure manifests tension rupture in initial stage under loads while become shear rupture when end area of control fissure extend certain site to bottom of the perilous rock, etc. These studies provide some important testing evidences about researching on development mechanism of perilous rock in the future.