Study On Stability Analysis And Reinforcement Measures Of High Loess Cutting Slope Of High Speed Railway

Geological disasters caused by slope deformation are one of the most frequent disasters in engineering.Due to the special environment and engineering geological characteristics of loess slopes,engineering diseases such as landslides,collapses,and foundation collapse often occur;natural loess can maintain steep slopes under natural conditions,but if environmental conditions occur Changes or various disturbances will cause corresponding changes in its stability,affecting or even threatening engineering safety.Based on the construction of the Lanzhou-Zhangye third and fourth line railway,this paper investigates and analyzes the engineering geology and design of the loess cut slope of the railway;compares and analyzes the similarities and differences between the railway and highway loess cut slope design related codes;through numerical simulation analysis Calculate the stability of high slopes of railway loess cuttings,study the influence of different slope ratios,platform widths and shallow soil moisture content of the slopes;and study slope reinforcement measures.The main research conclusions obtained are as follows:(1)Because railways and highways have different requirements for slope stability,the impacts and consequences of slope deformation and destruction of slopes are different,so the slope rate and step width of the two traffic facilities designed under the same geological conditions are,And the protection and reinforcement measures are different.(2)The slope stability analysis results show that the slope rate and platform width have a greater impact on the slope stability.In the case of the same slope rate,as the platform width decreases,the slope stability decreases;when the slope is gentle(slope rate 1:1.25),the decline is smaller,and the steep slope(side slope Ratio 1:0.75),the decrease is larger.In the case of the same platform width,as the slope rate increases(the slope becomes steeper),the slope stability gradually decreases;in the case of a small platform,the decline is greater.(3)In the natural state,among the 8 types of slopes analyzed in this paper,when only a gentle slope(slope ratio 1:1.25)is the case,the slope stability under the two platforms(large platform and small platform)meets the requirements Design specification requirements;the stability of the other six types of slopes does not meet the design requirements.(4)Rainfall infiltration causes the increase of soil weight,the decrease of matrix suction,the decrease of shear strength index,and the decrease of slope stability safety factor;the greater the thickness of infiltration,the greater the decrease.(5)By analyzing the effect of anchor rods on the reinforcement of high slopes of loess road cuttings,it is known that the safety factors of slope stability in general natural conditions and rainfall infiltration have been greatly improved.It shows that the use of anchor rod reinforcement measures can effectively improve the overall stability of the slope;the slope stability in the case of steep slopes and small platforms can meet the minimum safety factor requirements.