| The reinforcement design of the Dongbeidadai reservoir is the research analysis and evaluation based on practical engineering problems.The research object of northeast bad reservoir is mini reservoir area,reservoir basin above 14km2,there are hidden risks,such as that flood control standard is low,the current flood prevention capacity is less than 20 years;the main and auxiliary reservoir dam height is insufficient;the dam section size is insufficient;Seepage stability does not meet the requirements of the design specification for RCC dam.The dam has no slope protection for the dam face and back water slope,as well as the water conveyance channel of spillway,and the energy dissipation facilities are seriously damaged.In view of the existing problems,the following work has been done.First of all,the hydrological analysis and calculation of the reservoir are carried out by means of field surveys and collected data.Hydrologic analogy method and Annual runoff isoline method were used for calculation and comparative analysis in the designing annual runoff.Tiedi method and Regional flood comprehensive method were used to calculate flood peak and flood discharge.Flood routing of reservoir was carried out with the principle of water balance and results were used for the review and analysis of flood resistance capacity.Secondly,by using sampling analysis and in-situ test on rock and soil physical and mechanical indexes data of dam filling,stability evaluation of dam,dam foundation bearing capacity and the liquefaction of saturated sand;reservoir surface water and groundwater quality sampling analysis,evaluation of water environment on the erosion of concrete;find the regional seismic data,stability evaluation.Finally,combined the above analysis results with the relevant specifications,reinforcement of the Dongbeidadai reservoir is designed,including the design of reinforcement design,environment protection design and construction organization.The calculation results and conclusion provide that Dongbeidadai reservoir is a total capacity of 1.2543?107 m3 mini reservoir and the reservoir design flood protection standard is 20 years and check flood protection standard is 100 years.The reservoir area above the dam site is 14km2.The designed water level(P=5%)is 407.48 m with the corresponding storage capacity of 8.42?105 m3 and the check water level(P=1%)is 408.04 m with the corresponding storage capacity of 1.123?106 m3.The length of the main 270 m,and the auxiliary dam is 500 m long.The bottom elevation of spillway is 406.00 m.The discharge at the design water level is 63.00m3/s,and the discharge at the check water level is 97.90m3/s.The total duration of the project is 8 months. |
