Study On Evaluation System For Project Efficiency Of Highway Slope Treatment Project

In our country, the technicians have done large number of researches in preventing and controlling the hazards of high cutting slope, and have accumulated lots of experiences. The level of prevention and control has improved rapidly. However, because of the inappropriate design, construction and maintenance, there are always many potential hazards in some high cutting slopes. These potential hazards may cause crack, collapse, landslide, etc.. It is regrettable that these potential hazards can't be founded usually in time. There are many reasons for resulting in oversight, but the lack of reliable method and criteria of security evaluation for project efficiency is the main reason. For solving the above problems, this paper studies the method and criteria of security evaluation for project efficiency of highway slope treatment project, and develops the software system of security evaluation for project efficiency of highway slope treatment project based on the platform of GIS. The main contents researched in this paper are as follows:(1)Common types, features and mechanisms of slope problems are summarized.(2)Engineering measures of slop treatment project are classified as three categories. The mechanisms, advantages and disadvantages, applicable conditions of each engineering measure are summarized. The existing state and prospect of application about them are analysisd. Thirteen engineering measures that represent the technical level of preventing and controlling the hazards of slop, are introduced with emphasis.(3)Eight criterias of security evaluation for project efficiency of highway slope treatment project are proposed, namely the classification standard for stability, the classification standard for applicability, the evaluation standard for technical condition, the classification standard for traffic control, the classification standard of security control, the classification standard for security level, the early warning standard for danger, the classification standard for response to structural problem. On the basis of many references to the maintenance specifications for bridge and tunnel, three examination types of slop treatment project are suggested, namely the everyday examination, the periodical examination, the special examination. The content and demand of each examination type of slop treatment project are also put forward. Lastly, nine principles of slop treatment are suggested.(4)Based on classification of the structure hazard, the survey and analysis method, the evaluation method and standard for technical condition, the evaluation method and standard for local project efficiency, the evaluation method and standard for overall project efficiency, the evaluation method and standard for macroscopical status, the classification standard for response to structural problems about the prestressed cable framework, the anti-slide pile with prestressed anchor cables, the anchored frame, the anti-slide pile, the anti-sliding wall, are proposed. The reliability of each evaluation method is analysed. The flow chart of the evaluation of the project efficiency for every engineering measure is also brought forward. Additionally, the evaluation method for safety factor, the evaluation method for macroscopical status, the evaluation method for application about the grouting engineering measures, such as the grouted anchors, the grouted vertical steel pipes, and the anchored steel frame, are proposed. Lastly, four selection principles of the evaluation methods for project efficiency of highway slope treatment project are suggested.(5)According to above researches, the software systems of security evaluation for project efficiency of highway slope treatment project based on the platform of GIS, including the database system of slope information, the query system of slope information, the evaluation and decision system of project efficiency, the maintenance and management system, are developed, on the basis of Yuanjiang-Mohei highway slope treatment project. The software systems are used to evaluate the project efficiency of K2559+580 slope treatment project, which is located at the entrance to Sangongqing tunnel. The results show that the method and criteria of security evaluation, and the software system of security evaluation for project efficiency of highway slope treatment project based on the platform of GIS are reliable.Currently, the security evaluation for project efficiency of highawy slope treatment project is very important for our country. On the one hand, some slop projects constructed early need to be evaluted, on the other hand, the project efficiency of new slop treatment engineerings need to be examined too. So the researches of this paper will help improving the work of the security evaluation for project efficiency of highawy slope treatment project.