滚石冲击结构物动力响应特征数值模拟研究
投稿时间:2021-04-25  修订日期:2021-08-28  点此下载全文
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作者单位邮编
吴东东 成都理工大学环境与土木工程学院四川 成都 610059 610059
温继伟 成都理工大学环境与土木工程学院四川 成都 610059 610059
项天 成都理工大学环境与土木工程学院四川 成都 610059 610059
张杰 成都理工大学环境与土木工程学院四川 成都 610059 610059
肖烽 成都理工大学环境与土木工程学院四川 成都 610059 610059
基金项目:2020年省级大学生创新创业训练计划项目“非开挖钻具综合性能测试装置研发及钻具结构智慧设计”(编号:S202010616065)
中文摘要:在滚石冲击破坏建(构)筑物灾害中,滚石形状往往具有不确定性,建(构)筑物表面形状也不尽相同。当滚石冲击结构物时,由于滚石形状的不同导致其所表现出来的冲击动力响应特征也不同。采用ABAQUS有限元软件中的Explicit动力有限元方法,分别开展不同形状滚石冲击不同表面形状结构物的数值模拟研究,并对不同缓冲层的缓冲耗能特性进行对比分析。结果表明:在质量、初速度相同的初始条件下,形状不同的滚石冲击平面墙状的结构物时,冲击力峰值大小依次为正方体>圆柱体(底面)>圆柱体(侧面)>球体>三棱锥;当滚石冲击面形状由“尖”变“钝”时,结构物受滚石冲击处被破坏程度将变小,但其整体变形区域增大;对不同表面形状的结构物承受滚石冲击时,冲击力峰值大小依次为平面状>凸面状>凹面状>波浪面状>斜面状,相比而言,斜面状结构物具有较好的抗滚石冲击性能;对在结构物前方设置不同缓冲层时对滚石冲击的缓冲耗能特性进行对比分析,得出EPS-砂土复合垫层具有较好的缓冲耗散性能,其在实际的滚石灾害防护工程中具有广阔的应用前景。
中文关键词:滚石形状  结构物形状  缓冲层  冲击力  动力响应特征  地质灾害
 
Numerical simulation of dynamic response characteristics of structures impacted by rockfalls
Abstract:In the disaster of impact of buildings (structures) by rockfalls, the shape of the rockfall is often uncertain, and the surface shape of buildings (structures) is also different. When a rockfall impacts a structure, its impact dynamic response characteristics are also different due to the different shape of the rockfall. The Explicit dynamic finite element method in ABAQUS finite element software is used to carry out the numerical simulation of the impact of structures with different surface shapes by rockfalls with different shapes, and the cushioning energy dissipation characteristics of different buffer layers are compared and analyzed. The results show that under the initial conditions of the same mass and initial velocity, when rockfalls with different shapes impact flat wall structures, the peak value of impact force becomes from large to small in the order as cube>cylinder (bottom)>cylinder (side)>sphere>triangular pyramid; when the impacting surface shape of the rockfall changes from “sharp” to “blunt”, the damage degree of the structure impacted by the rockfall will decrease, but the overall deformation area will increase; when the structures with different surface shapes are subject to rockfall impact, the peak value of impact force is in the order of plane shape>convex shape>concave shape>wavy shape>inclined shape. The inclined structure has relatively better rockfall impact resistance. Through comparative analysis of the cushioning and energy dissipation characteristics of rockfall impact when different buffer layers are set in front of the structure, it is concluded that the EPS sand composite cushion has good cushioning and dissipation performance, and it has a broad application prospect in the actual rockfall disaster protection engineering.
keywords:rockfall shape  structure shape  buffer layer  impact force  dynamic response characteristics  geological hazards
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