高原梯度带地区碎裂岩边坡的地震破坏过程分析  

Analysis on Seismic Failure Process of Cataclastic Rock Slope in Plateau Gradient Zone

作　　者：陈渤 李超飞 李天斌[2] 周君波[2] 吴斌 狄海波 CHEN Bo;LI Chaofei;LI Tianbin;ZHOU Junbo;WU Bin;DI Haibo(Sichuan Tibet highway Co.,Ltd.,Chengdu,Sichuan 610041,China;State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu,Sichuan 610059,China;Sichuan Yakang Highway Co.,Ltd.,Chengdu,Sichuan 610041,China)

机构地区：[1]四川藏区高速公路有限责任公司,四川成都610041 [2]地质灾害防治与地质环境保护国家重点实验室,四川成都610059 [3]四川雅康高速公路有限责任公司,四川成都610041

出　　处：《矿业研究与开发》2022年第5期70-75,共6页Mining Research and Development

基　　金：国家重点研发计划项目(2016YFC0802203)。

摘　　要：针对高原梯度带地区地震诱发碎裂岩边坡变形破坏问题,采用UDEC软件对地震波45°斜入射作用下碎裂岩边坡的破坏进行了数值模拟。结果表明,边坡的变形破坏可以分为3个阶段:在地震波作用下,坡顶处的裂隙首先发育并迅速发展,边坡上部岩体被结构面切割而损伤破裂,完整性差,开始出现局部滑动;随着裂隙扩展贯通至节理面处,形成控制性结构面,边坡整体稳定性迅速降低,坡顶岩体开始局部下滑;随着岩体破碎严重区域增加,坡面上岩块以滑坡和崩塌2种形式掉落,形成堆积体,滑动区域逐渐扩展至边坡中下部,直至整体失稳破坏。地震动荷载对边坡的影响区域可分为破坏区和损伤区,破坏区对地震的动力响应明显大于损伤区;坡角和结构面倾角对边坡的变形破坏特征也有影响,坡角、结构面倾角越大,边坡变形破坏越严重。Aiming at the problem of deformation and failure of cataclastic rock slopes induced by earthquake in plateau gradient zone,UDEC software was used to numerically simulate the failure of cataclastic rock slopes under the action of 45°oblique incidence of seismic waves.The results show that the deformation and failure of slopes can be divided into three stages.In the first stage,under the action of seismic waves,cracks are first generated and developed at the top of the slope,the upper rock mass of the slope is damaged by the structural surface cutting,with poor integrity,and local sliding began to occur.In the second stage,as the crack expands and penetrates to the joint surface,the controlled structural surface is formed,the overall stability of the slope decreases rapidly,and the rock mass at the top of the slope begins to slide locally.In the third stage,with the increase of areas with serious broken rock,rock blocks on the slope fall in the forms of landslide and collapse to form accumulation.The sliding area gradually extends to the middle and lower part of the slope until the overall instability and failure.The impact area of the seismic load on the slope can be divided into the failure area and the damage area,the dynamic response of the failure area to the earthquake is greater than that of the damage area.Meanwhile,slope angle and structural surface inclination also affect the deformation and failure characteristics of the slope.The larger the slope angle and structural surface inclination,the more serious the deformation and failure of the slope.

关 键 词：高原梯度带 碎裂岩 边坡 地震波 斜入射 

分 类 号：TD824.73[矿业工程—煤矿开采]