| Daning reservoir was built in 1985,and the design flood storage capacity is 36000000 m3,which is a middle size reservoir,one of the retarding reservoirs of Yongding river. the main target is flood controlling, controlling the Guanting flood., improving the flood standard of the Yongding river reach inside the Beijing. The main structures of the reservoir are the main dam, the auxiliary dam, levees, flood gate, inlet gate of the retarding reservoir, and so on. Both the main dam and the auxiliary dam are the earth dam, the crest elevation of which is 62.5m,pvc weave cloth an anti-seepage wall with pvc incline core .The main dam is 568.5m long, the maximum height is12.5m, the auxiliary dam is 711.1m long, the maximum height is 9.5m.Besides bearing the original flood control task, Daning reservoir project increases its storage function of south water to north,to produce the best possible flood control and water supply results. the original reservoir is designed to detain Yongding flood, the Storage duration is quite short, after long-period storage the water, it is needed to recheck the stability of the dam, redesign the seepage prevention, confirm the design scheme.Combining with the construction of Daning storage reservoir , it is analysed and summarized the experiment and calculate results in the process of the project design. First,Combining engineering example, this paper studies the feasibility of composite geomembrane to anti seepage, all performance indexes of the used composite geomembrane are determined by theoretical analysis and experiment. second,The design parameters , such as the friction coefficient between the geomembrane and the cushion layer, are determined by experiment. third, experiments are conducted to study welding, repairing geomembrane, and the effective connect format between geomembrane and concret. The summarized key technical point of the anti-seepage geomembrane of the earth dam is of great consultant significance in the future project. |
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