Study On Hydraulic Erosion Law Of New Chongli Railway During Construction Period

This paper takes the newly built Chongli Railway as the research object.Monitoring rainfall and erosion in the study area.Through runoff plot method and erosion ditch measurement method,the runoff and sediment yield under rainfall conditions are monitored.Therefore,the hydraulic erosion law of four construction sensitive units in the process of railway engineering construction is studied.The prediction method of hydraulic erosion in railway construction period is studied,and the prediction model of hydraulic erosion in railway construction period is constructed.The main research results are as follows:(1)The flow rate of the roadside slope is in a power function relationship with rainfall;The rainfall erosion of the cutting slope is a power function relationship with the maximum rainfall intensity of 30 min;The slope gradient of the cutting slope increases from 38 degrees to 45 degrees,and the discharge and sediment yield of the slope decrease.The erosion amounts of runoff communities No.l and No.2 in June and September of 2018 were 9250.68(t/km2)and 7537.60(t/km2),respectively.The production flow per unit area of the runoff plots 1 and 2 is 0.041 m3/m2 and 0.043 m3/m2.(2)Erosion in embankment is linearly and positively correlated with half-width rainfall.During the monitoring period,the soil erosion of the embankment slope from June to September was 6712.45(t/km2).(3)The slope erosion within the spoil area is linearly positively correlated with the product of rainfall and maximum 30 min rainfall intensity;Implementing plant and engineering measures can effectively reduce the amount of soil erosion During the monitoring period from June to September,the erosion of the No.3 spoil ground in the village was 14110.96(t/km2).(4)The amount of erosion of the construction access road is linearly positively correlated with the product of rainfall and maximum 30 min rainfall intensity;During the monitoring period,the construction road of No.1 spoil ground in Houcun Village was 8674.68(t/km2).(5)The USEL has a large prediction error for soil erosion in roads and embankments.Soil and water loss prediction models for roads,embankments,spoil grounds and construction access roads were constructed.