格栅坝在泥石流防治中的应用——以汶川地震引发的烂泥沟泥石流治理为例  

Application of Grille-dam to Prevention and Control of Debris Flows:A Case Study on Control of Lanni Gully Debris Flow Caused by Wenchuan Earthquake

作　　者：吴强[1] 陈征宙[1] 刘裕华[1] 张明瑞[1] 曹东方[1] 

机构地区：[1]南京大学地球科学与工程学院,南京210093

出　　处：《防灾减灾工程学报》2011年第3期341-348,共8页Journal of Disaster Prevention and Mitigation Engineering

摘　　要：受汶川地震影响,四川等地泥石流治理更为迫切。泥石流的暴发具有突发性,在防治工程中,相比实体坝而言,格栅坝是一种节省材料、稳定性更高的拦挡结构,使用范围越来越广,但是目前尚无成熟的格栅坝设计方法。本文参考梳齿坝的已有理论确定了支墩间距的计算方法,并结合已有实验资料提出了格栅坝格栅间距的计算公式,改变了以往不同坝体乃至同一坝内各横梁间距一致的计算方法。另外,因支墩间隔相对较小,以简支模式计算石块对横梁冲击力并不合适,本文基于固定梁模式重新推导了计算公式,其计算结果与简支梁模式比较,数值大了3倍。最后考虑坝体建成后的不同情况,提出了支墩、横梁及两侧翼墙的详细计算工况,并基于以上设计理论,对烂泥沟泥石流治理工程的部分格栅坝进行了具体设计。Under the influence of Wenchuan earthquake,it is more urgent to prevent and control debris flows in many provinces especially in Sichuan.The outbreak of debris flows has suddenness,now we give first place to its prevention.Compared to solid dams,the grille-dam with material saving and higher stability is used for debris flow disasters mitigation more and more widely.But there is no systematic method for grille-dam design.With reference to the theory for calculating the distance of comb-dam-piers we present a method to calculate the distance between two piers of grille-dam,and put forward a formula to calculate the distance of beams of grille-dam based on the existing experiment data.It changes the calculation situation,in which the distances on beams in different dams or in different parts of the dam are the same. Seeing that the distance between two piers is not large enough,taking the beam of grille-dam as a simply supported beam is not reasonable,we consider the beam to be a fixed beam and calculate the force caused by the big stone＇s impact on the beam.The result from this mode is 3 times larger than that from simply supported beam mode.Finally,considering different situations of the dam after construction,detailed calculation condition for pier,beam and side dam of the grille-dam is presented,and on the basis of the design theory mentioned above,the design of control project of Lanni Gully debris flow is carried out.

关 键 词：泥石流 格栅坝 固定梁 冲击力 防治 

分 类 号：TU435[建筑科学—岩土工程]