Modelling of control actions at the operational stage of the life cycle of roads

Introduction. One of the complex problems of road asset management is the lack of unified “integral” indicators of their condition, which simultaneously take into account the change in the longitudinal smoothness of the road surface, visual condition, and the general modulus of elasticity at the operational stage of the road life cycle. Their absence leads to the impossibility of effective modelling of various scenarios of changes in the operational condition of the road when various kinds of control actions in the form of maintenance, repair and overhaul are carried out. The purpose of this study is to develop this criterion and formulate the basis for modelling various scenarios for the application of control actions at the operational stage of the life cycle.

Materials and methods. As the main indicator of the road condition at the operational stage of the life cycle, it is proposed to use the integral level of safety, which is the product of the shares of the road section that are in satisfactory condition according to the indicators — the general modulus of elasticity on the surface of the pavement, longitudinal smoothness and visual condition. To substantiate the applicability of this indicator and develop a methodology for modelling control actions, the apparatus of the theory of reliability and mathematical statistics is used.

Results. Based on the dependencies characterizing the change in each of these indicators during the service life, taking into account the assumption of the normal nature of their distribution, the design curve of change of the integral level of safety for highways with heavy traffic (> 5,000,000 applications of the design load for the service life) was obtained. Various scenarios for assigning control actions are considered and their influence on the value of the integral level of road safety is shown. It is shown that for a number of cases, the restoration of the consumer properties of the road without the restoration of the bearing capacity will not provide an extension of the service life. Modelling of various scenarios for the assignment of control actions in the form of maintenance, repair and overhaul work was carried out based on the indicator — the integral level of safety.

Conclusions. It is shown that for a number of cases the restoration of the consumer properties of the road without the restoration of the bearing capacity will not provide service life extension. Modelling of various scenarios for the assignment of control actions in the form of maintenance, repair and overhaul has been carried out. The prospects of application of the given approach connected with the use of the apparatus of the theory of efficiency of technical systems are determined.

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