Study On Loess Collapsibility And Potential Erosion Of New Railway In Shanxi Province

Railway construction in Shanxi Province is an important part of the national medium-and long-term railway network plan, and Shanxi provinces as an important component of China’s Loess Plateau, the loess stratigraphic distribution in the region is very broad, and the territory of the areas along more than a distribution of collapsible loess.Potential erosion as a unique way of erosion in the loess region, the loess areas of railway construction with a very serious potential harm. Collapsible loess areas, the harm caused by this potential erosion is more prominent. Therefore, in order to ensure that the railway route choice rationality and post-operation safety, the potential erosion of collapsible loess research is particularly necessary and urgent.In this thesis, Shanxi Province, the new railway from Datong to Xi’an Railway Passenger, environmental and geological conditions of Shanxi in central and southern overloaded channel. Luliang to Linxian County (Meng Gate) railway extension23along the railway line and the loess of engineering geological conditions of a detailed analysis and A field survey of typical sections of the loess potential erosion phenomenon to understand the distribution characteristics and laws of the railway collapsibility and potential erosion, to grasp the degree of development and characteristics of the potential erosion in the region.Collapsible loess and loess dust improved the field of independent design and personally organized and implemented large-scale test pit flooding contrast test, and the first earth pressure sensor and the moisture tension meter the introduction of the test, in collapsible loess along the railway line carried out a detailed analysis of study to clarify the District loess collapsible and collapsible distribution of submarine erosion control; of independent design and personally organized the implementation of the loess in situ disintegration test and to artificial rainfall simulation relying on loess erosion resistance test, for the loess disintegration of the potential erosion process, the linkages between the erosion resistance as well as controlling both the degree of development and developmental scale of the potential erosion.Through the field in situ testing and indoor findings, combined with the analysis of the study area are loess subsidence and the potential erosion of various factors, view of the collapsible loess potential erosion controlling the coefficient of collapsibility for instructions indicators, a model to predict the distribution of the degree of potential erosion of the railway, on the basis of the laboratory experiment, by analyzing the impact collapsible factors to determine the physical indicators related to the coefficient of collapsibility, the use of the MATLAB Fuzzy Neural Network Toolbox, using self-to adapt the fuzzy neural network (ANFIS) to establish the fuzzy relationship between the coefficient of collapsibility and select the main factors, a multiple regression model, and compare the prediction accuracy of these two models.Predict the Extent of the collapsible indirect distribution of the degree of prediction of the potential erosion. Thus provides a good collapsible loess potential erosion prediction methods for railway construction disaster prevention. Finally, the paper summarizes of loess collapsibility of railway engineering and the potential erosion hazard categories and characteristics and corresponding measures.