撞击荷载作用下板状岩体破坏特性数值模拟分析  

Numerical Analysis on the Failure Characteristic of Rock Plate Under Impact Loading

作　　者：廖志毅[1] 唐春安[1] 高军程[1] 王海涛[2] LIAO Zhiyi;TANG Chunan;GAO Juncheng;WANG Haitao(State Key Laboratory of Coastal and OffShore Engineering,Dalian University of Technology,Dalian,Liaoning 116024,China;Shool of Civil and Safety Engineering,Dalian Jiaotong University,Dalian,Liaoning 116028,China)

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024 [2]大连交通大学土木与安全工程学院,辽宁大连116028

出　　处：《水利与建筑工程学报》2018年第4期120-124,共5页Journal of Water Resources and Architectural Engineering

基　　金：国家自然科学基金项目(51627804)

摘　　要：板状岩体的动态破坏特性对岩体工程和防护工程具有重要的研究意义。基于有限元方法,通过引入三维动态接触算法,建立撞击模型,研究板状岩体在子弹中心撞击作用下的破坏特征。数值模型中,通过采用Weibull统计学分布考虑岩体非均匀性;利用连续等效损伤理论描述岩体损伤演化过程。数值模拟结果表明,动态接触算法能够有效地模拟块体之间的撞击过程。岩板在子弹中心撞击作用下,破裂最先出现在岩板背面中心处,并逐渐向岩板四周及正面延伸。同时,在较低撞击速度作用时,岩板断裂由产生的径向裂纹控制。随着撞击速度逐渐增加,环向裂纹出现,并与径向裂纹共同决定了岩板的断裂形式。It is of great significance for rock engineering and protection engineering to investigate the dynamic fracture behavior of rock plate.In this paper,based on the FEM,numerical impact model is established with the help of the three-dimensional dynamic contact arithmetic to investigate fracture characteristic of rock plate under the center impact of cuboid striker.In the numerical model,the rock heterogeneity and damage evolution characteristics are well considered by adopting Weibull statistical distribution function and equivalent continuum damage theory.Simulation results show that the three-dimensional dynamic contact arithmetic did well in modelling the dynamic contact process of two blocks.Under the impact of the cuboid striker,the failure firstly occurs on the rear surface of rock plate,which gradually propagates outwards to the rock plate boundaries and the front surface.In addition,the fracture of the rock plate is dominated by the radial cracks when the impact velocity is relatively slow,while additional circular cracks come to being with increasing impact velocity,contributes to the fracture of the rock plate.

关 键 词：岩板撞击 动态接触过程 非均匀性 数值模拟 

分 类 号：TU452[建筑科学—岩土工程]