Pavement Evaluation And Measurement Technic Of Highway's Reconstruction And Extension Engineerings

In the recent twenty years, the highway construction of our country is compelling. The total length has exceeded 53 thousand kilometers, which the majority are four lanes. But along with the development of economy and the time of highway operation prolong, the situation of some highway is not good, need to enlarge the traffic capacity, and increase the lane. Considering the growing tasks of highway rebuilding, The dissertation, basing on the traditional evaluation guideline methods which aim at pavement maintain, combining the pavement covering and adding surface field practice, has done research on the evaluation of the pavement performance and introduced dynamical index and new Nondestructive test technology. Pavement performance was evaluated and classified using Grey cluster theory. Guiding comprehensive utilization of old road, and it would be helpful to the research on the pavement extension and reconstruction.Firstly, The dissertation introduces the essence ideology of the pavement evaluation and measurement methods among national and abroad. The key points, the research content and the technique route of the dissertation have also been presented.Secondly, according to the current specifications for maintenance of highway asphalt pavement, the research in calculation and analysis of the road traffic data, pavement distress, structural strength of pavement, pavement evenness, anti sliding performance of pavement, many detection terms etc. The mechanism and field appliance status of such Nondestructive equipment as FWD and GRP have been introduced detailedly.Thirdly, analysis on the traditional method of pavement performance evaluation, the practical working state of pavement is difference with current static mechanical system, can not reflect the force characteristics and structure working situation of pavement completely, reality. So, need using dynamical index in pavement evaluation. Analysis some dynamic modulus inversion method of asphalt mixture at home and abroad, propose application area positively algorithm to get pavement surface layer dynamic modulus from FWD deflection basins, combining engineering instance to evaluate the bearing capacity of pavement structure.At last, research on the SSI as pavement whole bearing capability index do not considering asphalt mixture dynamic modulus in the current pavement evaluation, can not reflect actual condition completely. Establish PMI index based on pavement surface layer dynamic modulus to evaluate structural strength of pavement. According to PCI and PMI, establish evaluation model based on Grey cluster theory, combined with pavement base construction detection results by GPR, guiding comprehensive utilization of old road, making the plan of pavement extension and reconstruction scientifically.