Study On Anti-seepage Technology Of Hongyanhe Reservoir

The construction of Hydraulic Engineering is the rational use of water resources,the promotion of profits and the elimination of harm,the contribution to the National economic development,and the guarantee of people's well-being and national prosperity.How to use the existing construction technology to ensure the smooth implementation of water Conservancy projects,play a role,produce benefits,especially for reservoir construction,how to solve the problem of reservoir leakage,make the reservoir impoundment according to the design water level,and play the role of the reservoir is the final result and goal of the construction of the project.How to choose the most suitable anti-seepage scheme is a subject that engineers and scholars have been studying.It is not only of reference to the current water Conservancy construction,but also has guiding significance for the reinforcement of existing reservoirs with diseases.Based on the above background,the thesis is based on the previous research results,This paper analyzes the advantages and disadvantages of high pressure injection grouting impermeability technology,dam cracking grouting reinforcement technology,concrete impermeable wall technology,mixing pile impermeable wall technology,composite geotechnical film impermeability technology,curtain grouting impermeability technology and its application range.It is concluded that the technology of splitting grouting and backfilling anti-seepage wall is generally suitable for dam body.High-pressure injection grouting technology is generally used for reinforcement and impermeability of dam foundation,and it is suitable for all the fourth strata,and the treatment depth is large;Concrete impermeable wall technology is mostly used in dam foundation,concrete gate dam foundation,soil and stone cofferdam body and barrier foundation impermeable treatment,dangerous dam impermeable reinforcement treatment,etc..It is generally applicable to silt,powdery clay,sand soil and gravel soil with a diameter of less than 10mm;Stir pile impermeable wall technology is generally applied to dam foundation impermeable treatment,suitable for all kinds of soil layers with particle size less than 5cm;Composite geotechnical film impermeability technology can be used not only for impermeability in the construction of hydraulic buildings,but also for impermeable reinforcement of self-constructed hydraulic buildings.For foundations with little(about 10m)thickness of permeable soils,verticalmolding technology is used.The impermeability is relatively reliable and effective.For the deep foundation of permeable soil layer,the composite geotechnical film inclined wall is used to cover or other impermeable structure.Curtain grouting is suitable for crevices and voids in dam rock formations,with a wide range and depth.Taking Hongyanhe Reservoir in Gaoqu Village,Binzhou City,Shaanxi Province as an example of the project,based on the full analysis of the engineering geology and hydrogeological conditions of Hongyanhe Reservoir,combined with the engineering Geological Survey data,the leakage of the dam foundation and dam shoulder of the reservoir was analyzed and calculated.With reference to similar projects and experience practices,The impermeable curtain grouting scheme was chosen to treat the dam foundation of Hongyanhe Reservoir,the seepage problem was handled by means of the interception hole scheme for the right and left dam shoulder Pebble layer,and the impermeable rock mass in the strong to weak weathering zone of the left and right banks was treated by curtain grouting.After the anti-seepage treatment,the dam foundation was tested and designed and constructed according to the test results.After the trial water storage test after the construction of the reinforced curtain grouting,the seepage flow of the dam foundation of the Hongyanhe Reservoir was reduced by 60%.It can effectively control the seepage phenomenon of Hongyanhe Reservoir dam in the construction stage.Due to the integrity of the reservoir floor rock layer in the reservoir area,there is no permanent leakage problem and there is no need to do anti-seepage treatment.Considering that the contact area between the lower reaches of the dam foundation combined groove and the dam foundation gravel horizontal drainage layer is a weak site,in addition to fully compacting the soil material at the combined groove site,the dam foot adopts a composite geotechnical membrane and clay paving to prevent seepage.The composite geotechnical membrane is connected to the dam composite geotechnical membrane.The formation of a complete anti-seepage system,Hongyanhe reservoir anti-seepage achieved a very good effect.