Data Analysis And Subsidence Assessment Of High-speed Railway Project

In the process of High-speed railway construction, the subsidenceassessment on inline engineering plays an irreplaceable role in thehigh-speed railway construction process and safety monitoring. Theinfluence factors at construction site and the unpredictable geologicalconditions increase the difficulty of forecasting. Especially in the districtwhere the difference of regional subsidence is relatively severe. Theconventional monitoring method has been unable to meet the actual needs,urgently need to breakthrough of traditional subsidence monitoring dataacquisition and analysis methods. This thesis does deeply study in severalaspects of the subsidence monitoring data acquisition and analysis, toprovide a theoretical support for future High-speed subsidenceevaluation.In the field of data acquisition and analysis, In the currentmonitoring and evaluation process, data acquisition and analysis areaffected by many interference factors. This causes the fact thatmeasurement data curves present up " and " break " wave form, which isabnormal and can not be assessed by the current evaluation methods. Ifwe try to assess the curve, the passing rate is less than20%. Analyzingthe cause, regional subsidence is the main reason. In order to reduce oreven avoid the influence of regional subsidence, we draw the substance ofthese kinds of leveling points monitoring results by comparing the datameasured with different types of leveling point as monitoring benchmark:Ordinary bench mark monitoring results=Engineeringsubsidence+30meters deep regional subsidence+The surface regionalsubsidence;Deep bench mark monitoring results=Engineering subsidence+30meters deep regional subsidence-30meters deep regional subsidence=Engineering subsidence； Bedrock bench mark monitoring results=Engineering subsidence+30meters deep regional subsidenceThen we come to the conclusion that the result of the measurementwhich is monitoring benchmark for deep bench mark is engineeringsubsidence, and that is what we need. After analyzing the feasibility onthe actual project cost, we believe that, if we increase the deep benchmark to1per kilometer, it only makes the total cost of the projectincrease less than0.00703%. Compared with the remarkable engineeringeffect, the payments are acceptable. This improvement by using deepbench mark instead of ordinary bench mark can dissociate of regionalsubsidence and engineering subsidence very well, which also make goodpreparation for the next step of the evaluation work.In the field of data evaluation, High-speed railway is different fromthe traditional ballasted track for its small subsidence deformation leveland relatively large fluctuation. We discuss the current mainstreamsubsidence assessment methods Hyperbolic method、 expandedhyperbolic method、Three point method、Asaoka method and Exponentialcurve method to see if they are suitable for the " little magnitude、largefluctuation "data. Because Three point method can responsesedimentation deformation trend better, has high sensitivity to theobserved data, and can timely find the abnormal subsidence section,finally it is recommended as the optimal method. Because hyperbolicmethod has been widely used in the related deformation monitoringengineering and is better inclusive of data, which make up for thedeficiency of the three point method in this respect, it is recommended asthe suboptimal method, to make the necessary verification andcomplement to the predictions of three point method.This study bases on the high-speed railway that under constructioncurrently, Reference and basis for actual measurement data and combinedwith related theories. The research done in this paper is an attempt onhigh-speed rail line subsidence monitoring...