The Research Of High Speed Railway Subgrade Compaction Quality Testing Method And Control Index

With the rapid development of high-speed railway, roadbed of the use ofperformance, the stability of the roadbed, the after work settlement control and otherissues of research is becoming more and more important. The high-speed railwaysubgrade construction quality, ensure the subgrade filling quality key measures inaddition to select the appropriate filler, and strengthen the process control, and theroadbed compaction quality detection and evaluation.The existing national standard specifies a high-speed railway roadbed compactionquality control index, detection method, and evaluation system, but due to the highspeed railway subgrade of existing methods for the detection of limitations andpacking their inhomogeneity, is very difficult to control for high speed railwaysubgrade filling quality, thus shortening the service life of high-speed railway, and onthe development of national economy caused great damage. At the same time, theexisting high-speed railway construction using multiple indicators to ensure that thecompaction quality of subgrade.In the domestic and foreign high speed railway subgrade research field, researchand reasonable and convenient compaction quality control index, detection method,and evaluation system is a new research direction. According to China’s high-speedrailway construction practice, through field tracing test and analysis of theoreticalmodel, to our country highway roadbed compaction quality control index, testingmethod and evaluation system, the research has made some achievements, it issummarized in the following three aspects:(l) The Wuhan-Guangzhou high-speed rail in Hengyang B group of fillers andweathered sand conglomerate in two kinds of typical filler inside and outside theexperimental results carried on the thorough analysis, established in Germany and China s compaction compaction coefficient coefficient of the intrinsic relationshipbetween; now due to high speed railway using the large granular filler and the trend ofmore and more widely, in order to reflect coarse particle filler real engineeringcharacteristics presented in the trial of the addition of large scale compactionequipment important proposal; because of using separate porosity as high speedrailway subgrade compaction quality control indicator of the presence of defects, soput forward the compactness as subgrade compaction control index, in compactiondegree detection process which has considered the soil ’s nature, also in considerationof the soil composition distribution, so that you can meet the requirements ofSubgrade of railway passenger dedicated line density, and in the Wuhan-Guangzhouhigh-speed rail roadbed compaction engineering application is successful. Through alarge number of spot test and theoretical analysis for the first time successfullyestablished and correlation.(2) In Wuhan-Guangzhou Passenger Dedicated Lines for different detectionmethod is tested, and the results were compared and analyzed,K30、E v2、E vd、n、K andE v2/E v1quantiles values and our normative values correspond to. Researchresults show that the continuous dynamic detection index can well reflect the highspeed railway subgrade compaction quality, higher reliability and higher rationality.(3) According to the continuous dynamic detection of large amounts of data, theuse of probability and statistics theory, obtained the high speed railway subgradedynamic measure compaction degree distribution, master the main factors affectingdistribution, so we can better continuous dynamic detection, to ensure the high speedrailway subgrade compaction quality.In addition, through the above study are also presented for high speed railwaysubgrade compaction of reflections.