| In order to solve the problem of imbalance between supply and demand of water resources,many reservoirs have been constructed in plain areas.Once the leakage occurs,it will cause the continuous loss of water resources in the reservoir,and will cause a certain impact on the safety of the reservoir and cause the collapse of the reservoir.Therefore,it is necessary to carry out the seepage prevention treatment.At present,geomembrane impervious construction technology has been widely used because of its low investment,short time,good seepage control and small damage to other parts.However,with the popularization and application of geomembrane seepage prevention technology,some problems and difficulties have appeared in the actual construction process.Under the condition of large construction scale,the groundwater level is high.How to avoid the breakage of the geomembrane,how to deal with the problem of drainage and drainage,how to ensure the laying quality of the geomembrane,and strengthen the laying of the geomembrane.The construction management needs to be further strengthened in order to achieve good comprehensive benefits.This paper takes the project of Dezhou plain reservoir as a case.In view of the above problems,this paper studies the construction technology and construction management of the full tank geomembrane.Taking the Datun reservoir as the research object,it has certain representativeness.The reservoir of Datun reservoir has been used in the whole reservoir plate horizontal paving to prevent seepage.In the way of laying the two cloth and one film,a total of 5 million 220 thousand parties have been completed.The level of horizontal laying is the most in the country.The groundwater depth is shallow in the reservoir area and the elevation of the water level is higher than the design height of the basement membrane.Low ground water to the bottom of the paving bottom 0.5 meters below the height.Before the construction,the excavation drainage ditch was adopted to dewatering and drainage,and the main drainage ditch and branch ditch were arranged in combination with the site topographic layout.The subarea and drainage scheme was formed.Because of the large area of the geomembrane and the shallow underground water,the roof failure of the geomembrane must be taken into consideration when the reservoir was stored and the water level changes,and the construction technology was adopted in the design.Drainage and drainage blind ditch,check valve and earth pressure and weight combination measures have effectively solved the problem of air inflation caused by large area geomembrane laying.In this paper,the leakage status of the reservoir 1s analyzed with the help of the geological conditions,hydrologic environment and other factors.Through the analysis of the necessity of technology and economy,the construction scheme of the full reservoir seepage proof membrane is established.Secondly,based on the relevant theories,the destruction form and the influence factors of the geomembrane during the actual construction process of the geomembrane are deeply discussed.The quality control method of the geomembrane is formulated,and the drainage scheme of the construction site is studied again through the test,the drainage scheme of the open ditch is adopted and the drainage ditch is arranged in combination with the site terrain.Finally,in order to ensure the construction quality of geomembrane,the construction operation parameters are determined,and the main measures of construction technology and construction management are formulated..The key points of construction technology and main measures for construction management are put forward.At present,the operation condition of the dam is good,the seepage control effect reaches the design requirement,and the construction technology and management are studied,which can be used for reference for the seepage prevention construction and management of the whole reservoir plate geomembrane in the plain area. |
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