Landslide hazard became a major public concern in Hong Kong with the progress of urbanization. Disastrous landslides occurred frequently and induced the loss of life and property during rainy season. The large number of slopes renders it difficulty to maintenance all slopes at the same time. Such slopes would have to be treated based on a priority ranking system, taking into account their geotechnical conditions and potential consequences if a slope failure. The paper presents firstly the engineer's experience of Hong Kong in developing risk appraisal system. As so far, several procedures on slope maintenance priority had been set up under the supervision of Geotechnical Engineering Office (GEO), Department of Geotechnical Engineering, HKSRA. Those approaches represented the theme on Landslide Preventive Measures (LPM) of government at different stages. It should be noted that those approaches were also the summerization of many investigator's strive on risk analysis on slope stability. The methodology is still in its way of evolution with the new technology on computer and information science, the knowledge on decision-making, as well as the process of urbanization. It had been noticed that the uncertainty and vagueness of geological condition, environmental quality, natural ecological situation, as well as availability of resources makes current risk analysis unstable in practical operation. To develop fuzzy decision approach in landslide hazard evaluation, a pioneering work in risk assessment on slope failure, may be suitable in simulating the sophisticated decision process. Proposed hereafter aims at tentative work on developing an optimization appraisal scheme. Specifically, the theoretical frameworks of nonlinear programming and fuzzy decision must be merged with land planning consideration and evaluation of slope stability, dealing with information of the complex system.
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