Stability Analysis And Remediation For High Cutting Slope Of Loess In Existing Railway

With the development of the western economy and the national economy "along the way" strategy,the railway construction in the loess area is in the ascendant. Restricted by the environmental conditions, technical requirements and so, inevitably, the railway construction in loess area will encounter problems of loess high slope and the high cut slope is most prominent. Slope stability analysis of high loess cutting slope and reasonable selection of treatment scheme is a primary problem of railway construction in loess area.Longhai railway downlink K1562+180-K1562+280 section of high cutting slope landslide destruction disaster renovation as the research object, combined with the general high cutting slope remedial measures, on the road of high cutting slope of landslide disaster characteristics and causes, effect of slope stability and treatment measures were studied, the following conclusions are obtained.(1) This paper introduces the general situation of the Longhai Railway K1562 +180-K1562+280 left high slope engineering, including geographical location, meteorological hydrology, precipitation, topography, line main technical standards, line operation conditions and main equipment and so on. For the collapse and landslide disasters that occurred in the region cut slope, the factors that influence slope stability are analyzed. The landslide monitoring displacement data is quantitatively analyzed and monitoring displacement trend is predicted to evaluate the load shedding emergency measures of cutting slope.(2) The common measures to improve high and steep slope stability and principles to treatment cutting slope are briefly stated. As K1562+180-K1562+280 section of high cutting slope landslide renovation which occurs slope collapse and landslide for the study, two alternative reference regulation scheme are proposed and a schematic diagram of slope after renovation drawn. After considering the advantages and disadvantages of two improvement programs combined with on-site construction conditions, the final remediation program is determined.(3) For the route cutting high loess slope, the finite element analysis model is established and the stress-strain relationship of the soil slope is analyzed by the Mohr-Coulomb elastic plastic model. By looking through the plastic strain area and analyzing the stability safety factor, the region of cutting slope which prone to geological disasters collapses and landslides is discussed. The conclusions can be drawn that the deformation of first level of the original platform slope and near the superplastic deformation is obvious and the safety factor is small. So it is extremely easy to lose stability damage and appropriate consolidation protective measures should be taken.(4) According to the finite element analysis model corresponding to regulation scheme of slope, the rationality and effectiveness of the selected scheme are demonstrated by comparing the plastic strain cloud of the overall slope and regulation of the safety factor variation in disaster-prone regions. Finally the Evaluation of the effect and advantages of the final treatment plan is made.