Research On Law And Prevention Measures Of Road Erosion Disaster In North Shaanxi Oilfield Work Area

As one of the regions with the most abundant oil and gas reserves in China,the northern Shaanxi region is home to Petro China Changqing Oilfield and Yanchang Oilfield.However,because the northern Shaanxi area is dominated by loess hills,complex geomorphological conditions,special geotechnical properties,and significant differences in weather and climate,the roads in oilfield construction areas are prone to erosion disasters,which seriously threatens the safety of oil production equipment,on-site personnel,and crude oil transportation.Combined with data analysis and on-site inspection,the characteristics of road erosion in the oilfield work area were analyzed,and the formation mechanism and influencing factors of erosion were summarized.The morphological characteristics of the rills and the variation law of the sediment production rate;based on the model test results,the TOPSIS evaluation method of intuitionistic fuzzy sets was used to classify the risks of each section of the model,and the key sections were treated by spraying biological sand-fixing agents and flushing with water.The experiment verifies the feasibility of the treatment plan,and provides a theoretical basis for the sand and loess road erosion disaster management in the North Shaanxi Oilfield Work Area.This paper mainly draws the following conclusions:(1)The road erosion disasters in the North Shaanxi Oilfield work area are seriously developed,mainly manifested as rills of different sizes on the road surface.Both the slope and the rainfall have a significant impact on the development of the rill morphology.The main causal mechanism of disasters can be divided into two parts: internal mechanism(sandy loess properties)and external mechanism(water flow scouring),while other natural and human factors affect the internal mechanism and external mechanism through direct or indirect means.In the mechanism,which in turn affects the occurrence of road erosion disasters.(2)The development process of rill erosion is mainly divided into four stages: surface erosion stage-crater formation stage-rill development stage-cutting gully erosion and collapse stage.The formation of the ditch marks the transition of the water flow from the slope flow to the rill flow,and the formation of the multi-level gully head is the sign of the development stage of the rill.(3)According to the results of the indoor water discharge scouring test,it can be seen that the relationship between the rill morphological characteristics and the test duration under different working conditions is well fitted by the power function equation;Increase,the special cases are two working conditions of slope 18°,flow rate 6L/min and 9L/min,the test results fluctuate greatly,and the law is less obvious,mainly due to the simultaneous action of various erosions;When the slope is 6° and 12°,the overall decrease trend is shown with the increase of the test time,while the fluctuation is violent when the slope is 18°;it can be seen from the variance analysis that flow and slope have significant effects on the sediment production rate,and the interaction effect of slope and flow The effect on the average sediment production rate was not significant.(4)Using the intuitionistic fuzzy set TOPSIS evaluation method to evaluate the risk and risk level of each section of the model,the risk level of sections 1,3,and 7 is obtained as II,which is relatively dangerous;compare the relative proximity of the three(equivalent to the risk)(0.8 > Section 7 > Section 1 > 0.7 > Section 3 > 0.6),it is considered that Sections 1 and7 have higher risks and are the key sections of governance,and Section 3 is the sub-key section of governance.(5)According to the assessment results,spray biological sand-fixing agent on key sections,and compare the test results before and after treatment through the water flushing test.and the development of the average width,effectively reduce the road erosion disaster,and the more treatment sections,the more significant the effect.Therefore,it is believed that it is reasonable and feasible to control road erosion disasters in oilfield construction areas by spraying biological sand-fixing agents in key sections and sub-key sections,and provides a new idea for the control and prevention of road erosion disasters in oilfield construction areas.