冲击荷载下带支撑泥石流拦挡坝动力响应试验研究  

Experimental study on dynamic response of debris flow dam with braces under impact loads

作　　者：李俊杰[1,2] 王秀丽[1,2] 朱彦鹏[1,2] 罗维刚[1,2] 梁亚雄[1,2] 吴长[1,2] 

机构地区：[1]兰州理工大学土木工程学院,兰州730050 [2]西部土木工程防灾减灾教育部工程研究中心,兰州730050

出　　处：《振动与冲击》2015年第18期79-86,105,共9页Journal of Vibration and Shock

基　　金：国家科技支撑计划(2011BAK12B07);国家自然科学基金(51278236)

摘　　要：泥石流拦挡坝能够拦截泥石流所含固体物质,削减其下泄流量和密度,从而减轻泥石流对下游的危害,现已被广泛应用于泥石流灾害防治工程中。在常规的重力式拦挡坝基础之上,提出了一种带钢支撑的钢-混凝土组合式拦挡结构,通过常规坝体与新型坝体在固体冲击荷载作用下的模型试验,对比验证了新结构的抗冲击优越性。结果表明:支撑起到了抑制坝身裂缝出现和减小裂缝宽度的作用,有效减轻了撞击区域的破坏程度;相较于常规坝体,带支撑坝体动应变及加速度峰值均显著减小,最高减幅分别可达69.2%和47.8%,坝体变形及振动受到了支撑的限制;新型坝体动位移峰值显著小于常规坝体,其平均减幅可达46%左右,结构刚度得到了大幅度增强。Debris flow dams can intercept solid matter contained in debris flow and cut down the rate and density of discharged debris flow so as to reduce been widely applied to the prevention the damages to the downstream by debris flow. This class those of structures has and control engineering of debris flow disasters at present. A kind of steel-concrete combined structure with steel braces was presented based on the conventional gravity dam structure and the superiority of the new structure in terms of impact resistance was verified by means of contrastive model experiments under solid impact force on the conventional and new-style dams respectively. The results indicate that braces play roles in restraining cracks and reducing their width. They can effectively alleviate the extent of damage in impact areas. Compared with the conventional dam, the dynamic strains and acceleration peak values of the dam with braces both observably reduce. The highest reduction ranges of them may be up to 69.2% and 47.8% respectively, so the deformation and vibration are limited by the braces. The dynamic displacement peak values of the new-style dam are significantly less than those of the conventional dam, and the average reduction range may reach to about 46%, so the structural stiffness has been enhanced to a great extent.

关 键 词：固体力学 动力响应 固体冲击试验 泥石流拦挡坝 HJC动态本构模型 

分 类 号：TU317.1[建筑科学—结构工程]