无铰拱形泥石流拦挡坝研究  

Research on non-hinged arch dam against debris flow

作　　者：张宇[1] 王青[2] 尹明[3] 

机构地区：[1]中国科学院成都山地灾害与环境研究所,四川成都610041 [2]西南科技大学环境与资源学院,四川绵阳621010 [3]中国科学院基建计划局,北京100864

出　　处：《自然灾害学报》2006年第2期20-24,共5页Journal of Natural Disasters

基　　金：国家自然科学基金资助项目(40201009)

摘　　要：在泥石流防治工程中,拦挡坝是应用得比较广泛的一种措施。利用土木建筑中的拱结构形式,结合锚杆技术,引入了无铰拱形拦挡坝的概念。在狭窄河谷中,采用无铰拱形坝既可以改善坝体的工作环境,提高其承载能力,又可以减少材料用量,从而降低造价。针对无铰拱形坝的受力特性,进行了分析,提出了加强坝体、实现无铰的构造措施。Until now, the dam of blocking sand is a usual measure to prevent and control debris flow general construction style in Chinese traditional buildings, which has many advantages, such as better Arch is a bearing capacity and lower cost etc. In this paper, the authors put forward a new conception, namely, non-hinged arch dam in virtue of arch construction style in civil engineering and anchor. It should be emphasized, in narrow valleys, non-hinged arch dam has outstanding qualities, namely, this style of dam has better structural system to bear load, meantime people would decrease the amount of material and the cost of building. The authors analyzed the capacity of bearing load and put forward some measures to reinforce dam and to realize non-hinged. In architectural mechanics analysis, the authors assumed the central axis of arch dam should be circular arc shape. The loads that dam should bear were calculated with experiential formulas. In the mechanical calculation, the elastic center method was used, namely, when the elastic center of non-hinged arch dam was made sure, researchers can utilize the elastic center of dam to calculate the other three restrains of the supporting end so that calculating a hyperstatic problem can be changed to calculating a static problem. On the two supporting ends of dam, the authors designed prestressed anchors to shape rigid supporting and non-hinged, which shall be pressed into cliff at one end while connected with dam at the other end. Some measures were utilized to reinforce dam, i.e. a series of reinforced concrete layers should be laid in the dam with a special space and a reinforced net concrete cover should be applied on the front face of dam, and etc.

关 键 词：泥石流 拦挡坝 无铰拱 锚杆 

分 类 号：TV642.4[水利工程—水利水电工程] P642.23[天文地球—工程地质学]