不同形状落石冲击棚洞动力响应试验研究  

Experimental Study on Dynamic Response of the Rock Shed Under Rockfall of Different Shapes Impact

作　　者：沈沛泽 周晓军[1] 唐建辉[1] 喻炳鑫 张育锦 SHEN Peize;ZHOU Xiaojun;TANG Jianhui;YU Bingxin;ZHANG Yujin(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学土木工程学院,成都610031

出　　处：《交通科技》2024年第5期123-126,138,共5页Transportation Science & Technology

基　　金：四川省自然科学基金(2022NSFSC1127);中央高校基本科研业务费专项奖金(2682023CX075)资助。

摘　　要：为探明落石形状对棚洞结构动力响应、落石冲击荷载的影响,以框架型棚洞为研究对象,采用缩尺模型试验研究不同形状落石冲击作用下落石冲击力、冲击压应力、棚洞顶板位移、振动加速度的变化规律。结果表明,落石形状对棚洞顶板位移、振动加速度影响显著,与正方体落石冲击棚洞相比,不同高度球体与椭球体落石冲击作用下,棚洞顶板位移分别减小了41.1%,76.1%,棚洞顶板振动加速度分别减小了35.7%~68.9%,71.7%~87.6%。正方体落石冲击力、冲击压应力最大,球体落石次之,椭球体落石最小。In order to investigate the influence of rockfall shape on the dynamic response of rock shed structure and impact load of rockfall,the frame type rock shed was taken as the research object.The changes law of the rock impact force,impact compressive stress,displacement and vibration acceleration of the rock shed roof slab under the impact of rock fall with different shapes were studied by the reduced scale model test.The results show that the rockfall shape has significant influence on the displacement and vibration acceleration of the rock shed roof slab.Compared with the response of the impact of cubic rockfall on the roof of the shed,the displacements of the rock shed roof slab are decreased by 41.1%and 76.1%respectively,and the vibration accelerations of rock shed roof slab are reduced by 35.7%~68.9%and 71.7%~87.6%respectively,under the impacts of spheroidal and ellipsoidal rockfalls at different heights.The impact force and impact compressive stress of the cubic rockfall are the largest,followed by the spheroidal rockfall,and the ellipsoidal rockfall is the smallest.

关 键 词：落石 棚洞 形状 动力响应 模型试验 

分 类 号：U457.5[建筑科学—桥梁与隧道工程]