Field Test Study Of Seepage Well In Mazhen

The overall water resources in Northern Shaanxi loess hilly region is scarce,which is difficult to develop,with the construction of energy and chemical base in Northern Shaanxi is speeding up,the shortage of water resources will restrict the development of energy and chemical base in northern shaanxi.Therefore,accelerating the construction of energy and chemical base in Northern Shaanxi,which must develop water resources scientifically in order to guarantee the sustainable development of that the Yellow River,along the seepage wells is one of the effective ways to solve the problem of the shortage of water resources.MA Zhen seepage well located in east of the Yellow River ocean in Shenmu,the aquifer is mainly composed of the Quaternary aquifer and the aquifer of the Triassic clastic rock,which has a good water supply significance due to good water permeability,groundwater recharge conditions are good.Based on the seepage theory,after the analysis of a large number of seepage well engineering structure,hydrogeological conditions and water effect,the field test was carried out on the seepage wells under the condition of three-dimensional seepage field characteristics and surrounding changes,and using the method of numerical simulation of pumping test results are simulated.To establish a reliable calculation model for water intake of seepage wells basing on the " Coupling model of seepage and pipe flow “,which is used to explore the optimal design scheme of water intake in different aquifer lithology.The characteristics of three dimensional seepage field in the process of pumping test with stepped steady flow are analyzed by the observation hole data set around the seepage well: In the process of pumping,the change of the groundwater level in the Quaternary strata obviously changes with the fluctuation of the water level in the Yellow River,and shows a slight lag in time;During seepage well pumping,the water head difference exists between each aquifer,and which is also increasing with the increase of pumping quantity difference,showing that whether in the future or exploitation of natural condition,the water supply of the Yellow River river is carried out by the way of three-dimensional flow;When the underground water is exploited,there is little effect on the groundwater in the the Yellow River river.Based on the understanding of the geological conditions,weather conditions and hydrogeological conditions of the study area,the three-dimensional geological structure model model was established by using geological radar and drilling data.Based on the theory of seepage pipe coupling model,this paper sets up the 3D hydrogeological numerical model of seepage well.The model was identified by pumping test data,the hydrogeological parameters were calculated by fitting three fall outflow of seepage well.On this basis.There are three kinds of optimization schemes: the different elevation schemes of the radiation hole,the length of the same length of the tunnel,and the number of different radiation holes.Under the premise of considering the difficulty and cost of construction,there is a better effluent effect when the radiation hole angle is between 20 degrees-30 degrees and the radiation hole extends into the same length the Quaternary;There is a better effluent effect when the space between chambers is between 70m-100m;The increase of the number of radiation holes can increase the outflow of seepage wells,when the number of radiation holes increases to a certain extent,the effect of increasing the water intake of the seepage well is not ideal,but it will increase the difficulty and cost of construction.Through the analysis of hydrogeological parameter instability and comparison results of water discharge schemes for seepage wells with different river seepage capacity,In the design of the seepage well,it is necessary to strengthen the hydrogeological investigation in the early stage,to obtain the hydrogeological parameters of the study area as accurately as possible,and to improve the efficiency of the flowing well.