Combinations of curved segments of the plan and longitudinal profile of forest roads
Annual economic losses due to the unsuccessful design of the route of the timber haul road cause enormous damage to enterprises and sectors of the economy. Therefore, an increase in the efficiency of road construction production is associated with the improvement of calculation methods for the design and construction of timber highways. With the increase in traffic intensity on forest roads, it became necessary to optimally design the geometric elements of the roads. The basis for the formation of the future road is its route, and the outline of this route largely determines the technical qualities of the future road. The work examines and analyzes various combinations of curvilinear sections of the plan and the longitudinal profile of the route of timber transport roads. The main reasons for the often obtained unsuccessful combination of plan curves and longitudinal profile are insufficient study of visual clarity and smoothness, as well as insufficient experience of practical use in design organizations of the known principles of spatial design of timber haul roads. The aim of the study is to analyze, which will make it possible to determine the typical combinations of the route in plan and profile and their frequency found in the projects of timber hauling roads and their frequency and to estimate, in a first approximation, the correspondence of these combinations of visual clarity and smoothness. In the work various combinations of typical sections of the plan and profile and their variants are systematized, indicators of the degree of mutual coordination of the curves of the plan and the longitudinal profile are obtained. The studies carried out gave a general idea of the types of combinations of plan and profile curves and their frequency in projects of timber transport roads.