Qualitative analysis on the effect of flood control and engineering safety - , seizing lots of water conservancy effective adjust storage . then making water level risen and reservoir backwater enlarged in the same flow level ? effect on beach and the buildings across river , soil salinization caused by flow from a lower to a higher place and unsmooth groundwater drainage destroy of travel resource caused by disorder enclose tideland for cultivation in reservoir silt up flood plain are given , then presents enclose tideland for cultivation dyke is important cause which water level rise in reservoir 本文从青铜峡水库泥沙淤积入手，分析水库泥沙淤积特性和库区围垦堤开发利用淤积滩地的现状，对防洪安全及工程安全的影响、侵占大量的有效调蓄库容、造成同级流量下水库水位抬升水库回水上延、对沿岸及过河建筑构成影响、因水位抬升致使库区周边灌区地下水排水不畅乃至倒灌而造成土地盐碱化、对水库库区大量淤积滩地无序围垦造成旅游资源破坏等五方面影响的定性分析，提出库区围垦堤是水库水位抬升的重要原因。
Seismic fracture , fault fracture and permafrost fracture all gave negative effects on engineering construction and formed geological hazards at many localities along the golmud - lhasa highway and railway ice fractures formed in freezing rivers and lakes and on the top of pingos have not shown any hazard effect on engineering constructions up to the present 地震破裂、断层裂缝和冻土裂缝对青藏公路、青藏铁路及沿线工程安全具有不良影响，这些地裂缝切割错断路基，形成路面破裂和路基滑塌，产生显著的灾害效应。
The theory and method , such as analytic hierarchy process , grey system and so on , together with the knowledge of embankment engineering , are introduced into the thesis , which performs relatively detailed study on method of comprehensive safety assessment , synthesis assessment structure system , method of measuring assessment index and the precautionary mode of safety evaluation of the levee engineering 本文以河道堤防工程为主要研究对象，应用层次分析、灰色系统等理论和方法，对堤防工程的安全综合评价方法、综合评价结构体系、评价指标度量方法以及堤防工程安全预警模式等方面内容进行了深入的分析研究。
In the light of the implementation of construction safety supervision of donghai bridge , and environmental features of the bridge over open sea , the specific contents and bases of the construction safety supervision of the bridge are described , and several points of proposals and matters of attention for future implementation of bridge construction safety supervision are put forward 摘要通过本工程安全监理工作实践，针对外海跨海大桥所处的环境特点，阐述了本工程安全监理工作内容和安全监理工作依据，提出了以后开展安全监理工作的几点建议和注意事项。
