钢管混凝土格栅坝抗冲击性能试验及参数分析

第50卷 第12期2018年12月

哈 尔 滨 工 业 大 学 学 报JOURNAL OF HARBIN INSTITUTE OF TECHNOLOGY Vol.50No.12Dec.2018 DOI:10.11918/j.issn.0367-6234.201801054钢管混凝土格栅坝抗冲击性能试验及参数分析

冉永红1,2,王秀丽1,2,周 锟1,2

（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（兰州理工大学),兰州730050)摘 要:为有效减轻泥石流大块石冲击造成的灾害,提出一种钢管混凝土格栅坝.通过固体冲击试验研究该结构的冲击动力响应,总结了结构的响应模式.同时对试验过程进行数值模拟,模拟结果与试验吻合较好.最后利用数值模拟方法对结构进行参数分析,研究桩管套箍系数二撑管径厚比和桩-撑刚度比对结构动力响应的影响.结果表明:结构的典型响应模式可以概括为构件轻微损伤二构件弯曲破坏二连接节点破坏;桩管受冲击时结构能发挥良好的整体耗能作用,而撑管受冲击时结构整体耗能作用不明显;桩管套箍系数二撑管径厚比和桩-撑刚度比对结构动力响应的影响受桩管和撑管外径二壁厚等单因素变化的制约.钢管混凝土格栅坝具有良好的抗冲击性能.

关键词:钢管混凝土格栅坝;动力响应;试验研究;参数分析;抗冲击性能

中图分类号:TU359;X43文献标志码:A 文章编号:0367-6234（2018)12-0045-08

Experimental study and parameter analysis on the shock resistance of concrete filled steel tubular crib dam

RAN Yonghong 1,2,WANG Xiuli 1,2,ZHOU Kun 1,2

（1.School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China;2.Western Center of Disaster Mitigation in Civil Engineering （Lanzhou University of Technology),Ministry of Education,Lanzhou 730050,China)Abstract :To mitigate disaster caused by the impact of debris flow boulders,a concrete filled steel tubular crib dam was proposed.Solid impact tests were carried out to study the impact dynamic response of the structure,and the response modes of the structure were summarized.The numerical simulation of the test process was performed,and the results were consistent with the test.The parameter analysis of the structure was carried out to study the influence of confinement coefficient of the piles,radius-thickness ratio of the braces,and stiffness ratio of piles and braces on the dynamic response of the structure.Results showed that the typical response modes of the structure included slight damage of member,bending failure of member,and joint failure.The structure performed good overall energy dissipation ability when the pile tube was impacted,while overall energy dissipation was not obvious when the brace tube was impacted.The influence of confinement coefficient of the piles,radius-thickness ratio of the braces,and stiffness ratio of piles and braces on the dynamic response of the structure was constrained by the single-factor variation of the diameter and thickness of piles and braces.These findings suggest that the concrete filled steel tubular crib dam provides good impact resistance.Keywords :concrete filled steel tubular crib dam;dynamic response;test study;parameter analysis;shock resistance

收稿日期:2018-01-10

基金项目:国家自然科学基金（51778273)

作者简介:冉永红（1988 ),男,博士研究生;

王秀丽（1963 ),女,教授,博士生导师通信作者:王秀丽,1135739056@https://www.wendangku.net/doc/fd16349731.html, 泥石流是易发于山区的严重自然灾害之一,自1950年到2011年,泥石流已在全世界范围内造成巨大的财产损失和人员伤亡[1].尤其近年来,山区泥石流灾害频发,引起越来越多的关注.

为减轻泥石流灾害,学者们展开了大量研究:文

献[2]提出了预测泥石流流速的理论模型,并通过

实验室和现场试验进行验证;文献[3]以泥石流强

度指标代替冲击力来确定建筑物的损坏,提出一种

泥石流灾害定量风险评估模型;文献[4]介绍了日本最新的自然灾害早期预警系统;文献[5]基于小尺度建模方法,并结合试验分析泥石流的冲击模型;文献[6]介绍了台湾泥石流非结构性预防策略的过程和影响;文献[7]将柔性防护系统引入泥石流防治工程中,提出其设计方法.目前研究大部分集中于泥石流特性和起动机理方面,对拦挡结构研究较少.另外,为了治理泥石流灾害,国内修建了重力坝二格栅坝及柔性体系等拦挡结构[8].早期的拦挡结构以浆砌片石筑成的重力坝居多,其抵抗泥石流冲击破坏的能力有限,尤其在大型泥石流作用下容易发生严重的整体破坏（溃坝),这样不仅不能减轻万方数据