Study On Seepage Field Simulation And Drainage Effect In Landslide Area Of Maoxian Electrochemical Factory

Water is the main influencing factor in slope sliding,so water drainage is very important in slope treatment.In engineering treatment,the related software of groundwater seepage numerical simulation can be used to simulate and analyze the drainage of water in slope treatment,so as to understand the change of groundwater seepage field in slope treatment and the drainage effect of treatment project.This paper is based on the investigation report,field measurement,theoretical analysis,empirical value and test data of the slope to the west of the plant area of Minjiang Electro-chemical Co.,LTD.,Tuanjie Village,Fushun Township,MAO County,Aba Prefecture,Sichuan Province.Using Modflow software as a research tool,the 3d geological model of slope body is established based on the parameters required for numerical simulation and the parameters of each rock layer and hydrogeological conditions after the test.The initial permeability coefficient of each rock layer is obtained through the variable head permeability test.Cultivated soil and artificial filling soil K=1.210m/d,gravel soil K=1.723m/d,fully weathered phyllite K=1.070m/d,strongly weathered phyllite K=0.509m/d.After the fitting calculation of two time periods from January 20,2019 to April 27,2019 and August 3,2019 to January 3,2020,the equivalent replacement values of the parameters of each layer of the slope body and the pumping/injection Wells of each drainage structure are respectively.Cultivated soil and artificial fill soil K=0.820m/d U water supply degree=0.14,gravel soil K=1.310m/d U water supply degree=0.2,fully weathered microne K=0.790m/d U water supply degree=0.08,strongly weathered microne K=0.076m/d U water supply degree=0.03.The equivalent flow of recharge boundary(injection well)and discharge boundary(pumping well)is 0.09m~3/d,the equivalent flow of drain boundary(pumping well)is 0.15m~3/d,the equivalent pumping water of dredge well is 0.14m~3/d,the equivalent pumping water of tilt drainage hole is 0.2m~3/d,the equivalent pumping water of surface drainage ditch is 0.1m~3/d,and the equivalent pumping water of drainage hole is 0.16m~3/d.Is to build a reliable model on the basis of the prediction with and without drainage drainage structure structure in the different time rainstorm slope under the condition of water level change,selection of April 1,2019 as the initial water level,water level in maoxian county area in April 2018?August 2018(4.59 mm/d),rainfall rainfall of July,2018(9.54 mm/d),the last week of June,2018 rainfall(20.44 mm/d)as a condition of calculation to predict,At the same time,the seepage field of the slope body with or without drainage structure in the dry water season(January 2019?April2019)is simulated,and the corresponding results are obtained.In the absence of drainage structure,the water level of slope body is mainly controlled by rainfall,and in the presence of drainage structure,the water level of slope body is mainly controlled by drainage structure.Taking into account the fitting error,the final calculation results show that the draining proportion of drainage structure is between33.7%and 49.6%.According to the design requirements of slope drainage structure,the slope body is in a stable state when the proportion of drediness should reach about30%?32%,and the calculated results show that the slope drainage structure meets the design requirements.