爆破开挖对岩质高边坡稳定性的影响分析

以某采石厂矿石爆破开挖形成高边坡为例,采用ABAQUS有限元软件对爆炸荷载引起的岩石振动效应进行模拟研究,得到了岩质高边坡在爆破作用下的位移规律和质点振动衰减规律。分析了开挖扰动下地应力释放和爆炸应力波耦合作用下的边坡应力状态与边坡稳定性。结果表明:爆破振动产生的应力为静力开挖的9倍,振动造成局部岩体裂隙发育,是边坡出现塑性变形的主要原因;最大位移出现在边坡的中下部,质点振动的最大速度为59.2 cm/s。最后通过对边坡应力状态、塑性区的发展、位移变化以及质点的运动速度四个方面对边坡的稳定状态进行了综合评价,并今后指导施工提供一定依据。

Influence of Blasting Excavation on High Rock Slope Stability

Taking a high slope formed by the quarry blasting as an example,the ABAQUS finite element software was used to simulate the rock vibration effect caused by the explosion load.The displacement law and the vibration attenuation law of the rock slope under the blasting were obtained.The stress state and slope stability of the slope un-der the interaction of ground stress release and explosive stress wave were analyzed.The results show that the stress generated by blasting vibration was 9 times than that of static excavation,and the local rock mass fissure was devel-oped due to vibration as the main reason for the plastic deformation of the slope.The maximum displacement appears in the middle and lower part of the slope,the maximum speed of particle vibration was 59.2 cm/s.Finally,the stabil-ity of the slope was evaluated comprehensively by four aspects,the stress state of the slope,the development of the plastic zone,the displacement change and the velocity of the particle.