Research On Analysis And Evaluation Methods Of Environmental Vibration Of Agricultural Saturated Soil Sites Caused By High-speed Rail Transit

As a significant part of the national transportation industry,Chinese high-speed railway plays an increasing role and makes a huge contribution in promoting the development of the national economy.With the rapid development of Chinese high-speed railway,environmental vibration caused by high-speed rail transit has been paid more and more attention.In order to study the environmental vibration of saturated soil ground in the agricultural frozen area caused by high-speed rail transit,and evaluate its influence on surrounding buildings and agricultural facilities,Heilongjiang Daqing Longfeng wetland was chosen for the field observation.Furthermore,the vibration of saturated soil ground caused by high-speed train was observed on the spot.The acceleration time history of ground surface when high-speed train passed through agricultural saturated soil ground was collected.By analyzing the maximum acceleration amplitude and power spectrum,the attenuation relationship of environmental vibration of saturated soil site of high-speed rail transit was summarized.The influences of different train numbers and different speeds on the vibration level of saturated soil acceleration were analyzed and compared.Based on the results,the applicability of the environmental vibration evaluation index of China,Japan,the United States,and other countries in the application of high-speed rail transit to the environmental vibration of saturated soil site in the agricultural seasonal frozen area was analyzed.The main work carried out is summarized as follows:1.After the reconnaissance survey,the observation site is determined,and the attenuation array observation plan was drawn up according to the on-site situation.The wireless acceleration observer was installed at the fixed point of RTK to carry out the array observation.The acceleration time of CRH high-speed trains with different speeds,different running directions,and different numbers of carriages was obtained.On the basis of analyzing the time peak value and power spectrum of vibration acceleration at different speeds,the attenuation law of environmental vibration caused by high-speed rail transit in saturated soil site was summarized.2.The program for calculating acceleration vibration levels was developed.The power spectrum of environmental vibration acceleration caused by 8 and 16 high-speed trains were taken as the research object to analyze and compare the influence of different high-speed trains with the different number of coaches on the vibration levels of saturated soil acceleration.Bytaking the power spectrum of environmental vibration acceleration caused by high-speed trains with 16 carriages and running speeds of 180km/h,200km/h,and 244km/h respectively as the research object,the influences of different speeds on vibration stages of saturated soil acceleration were analyzed and compared.3.The evaluation indexes and limits of environmental vibration in China,the United States,Japan,and other countries were comprehensively analyzed.The observation results of environmental vibration of saturated soil sites caused by high-speed rail transit were analyzed by using the evaluation methods of environmental vibration in various countries respectively.Compared with the observation results of environmental vibration of saturated soil sites caused by rail transit,the applicability of each evaluation method was summarized.