Browsing by Subject "Forest roads"
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Item A Data Base for the U.S. Forest Service Pavement Management System(Council for Advanced Transportation Studies, 1981-05) Hernandez, Jorge E.; McCullough, B. Frank; Hudson, W. RonaldThis report is the first phase of a proposed three-phase project developing and implementing a database for the Pavement Design Management System (PDMS) which was developed by The University of Texas at Austin in cooperation with the U.S. Forest Service. PDMS may be used to design asphalt concrete, surface treatment, and aggregate surfaced pavement structures. Results from the implementation of PDMS in certain Forest Service design offices indicate good performance of PDMS regarding the asphalt concrete and surface treatment pavement designs. However, the implementation results also indicate that the models used in PDMS for the design of aggregate surfaced roads need to be improved. This is not surprising, since these models were not developed with data from Forest Service roads. The characteristics of the Forest Service road system make it truly unique in the world. Because of this, roadway structure design and management methodologies developed by other transportation agencies are not adequate for Forest Service needs. To improve these methodologies in PDMS, performance information on Forest Service roads must be collected and analyzed. Even a small improvement in the management of pavement structures system-wide will result in the saving of millions of dollars annually. Therefore, a data base is a necessary and valuable tool.Item A Pavement Design and Management System for Forest Service Road : A Conceptual Study(Council for Advanced Transportation Studies, 1974-07) McGarragh, Thomas G.; Hudson, W. RonaldThe design of pavements for low-cost, low-volume roads is a complex procedure involving numerous variables. Because of the development of new information in the pavement field during the past decade, the complexity of the interaction of these design variables has become better understood and the need for a systematic approach to the problem of pavement design and management has become evident. This report is an attempt to apply this systematic approach to the design and management of low-volume Forest Service roads. The report summarizes the problem analysis efforts of the project staff, beginning with the identification of the problem through its recognition and definition. Using the FPS type of working Pavement Design System developed in Texas as a conceptual base, an extensive examination of the major subsystems that make up the majority of existing pavement management systems for "higher type" roads was conducted. In attempting to define these basic components for the proposed low-volume road system, it was found that interaction between the project research staff and Forest Service personnel was of great importance. This interaction was achieved in the form of an interagency "brainstorming session" and later an "importance rating" of the ideas presented at this meeting. The results of this interaction along with the research efforts of the project staff allowed for an initial definition of the major components in the proposed system. Where complete definition of these subsystems was not possible, relevant questions and ideas were formulated for consideration in their further development. Finally, an example conceptual pavement management system for low-volume roads that incorporates all the ideas and concepts developed during the past year's research is presented. It is concluded that the development of pavement management systems for low-volume Forest Service roads is indeed feasible and should be pursued in Phase II of the project. Recommendations for major areas of further research are also given.Item A Pavement Design and Management System for Forest Service Roads: A Working Model. Final Report, Phase II(Council for Advanced Transportation Studies, 1977-02) Roberts, Freddy L.; McCullough, B. Frank; Williamson, Hugh J.; Wallin, William R.This is the second phase of a three-phase effort to develop and implement a pavement design and management system for low-cost, low-volume roads, in particular, Forest Service roads. The specific object of this phase is to develop working pavement design and management models and other information needed for optimization and decision making. Using the results of the Phase I conceptual study and a pre-existing program, an initial computerized working pavement design and management model was developed. During this phase, through continual coordination with various Forest Service engineers, this initial model was constantly modified to better consider the Forest conditions, design requirements and operating procedures. The resulting model, LVR, which is now ready for implementation and trial usage by the Forest Service during Phase III of this project, will design pavement structures based on an equal-effectiveness criterion for bituminous surfaced, aggregate surfaced or surface treatment roads. Two roads are considered to have equal effectiveness if they provide the same quality of service for the same length of time. Bituminous surfaced pavements are designed using a single failure criterion which is based on the AASHTO method currently in use by the Forest Service.