Research On Rapid Detction Indicators Of Subgrade

With the economy development, the mileage of highway increased from888000in1980to4.1million in2012, among which the traffic mileage of highway reached to96000. Our country gradually enters into the maintenance phase from the large-scale highway construction.We should understand the working condition of the road itself. Once we make a plan to maintenance the scientific road way, or before make a dicision on the road care.To understand the status of the highways in response to its for testing and evaluation,There is a large number of highway safety survey assessment that requires fast and nondestructive testing. Therefore, the research and development of efficient,rapid and nondestructive subgrade detection techniques is of great significance.This research, on the one hand, research results will fully absorb the existing, on the other hand, aiming at the characteristics of subgrade work condition,and on the less research has involved or not very explicit content,will take some means, such as, data retrieval collection, investigation, model test, field test, theoretical analysis, numerical simulation, relying engineering verification. The research content is as follows:First,study the roadbed disease and operation condition, summary the subgrade and roadbed disease type, analyse the influence factors of performance of roadbed.Second, propose the characterization of the subgrade work status indicators, and study its significance and obtain basic meaning, characterize methods, select out the indicators which can realize rapid detection.Third,research the rapid detection method, detection basis theory and technology, implementation method and steps.Finally,through the practical engineering detection experiment, verified the water content, compactness of two indicators of rapid detection. through the testing results of evaluation of subgrade work condition, and roadbed treatment advice is given.