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Abstract In order to study the status of global stability of a slope，the decision-making model of multi-attribute and interval number is constructed to carry out global stability analysis of slope. With this method，the research process can be realized. According to the actual geological conditions and the situation of engineering sections of Guanjia slope，the set of influence factors and research objects are established，and the decision-making model of multi-attribute and interval number is adopted，and the safe and stable states of slope are back analyzed. Moreover，the macroscopic signs of slope failure are referenced to perform comparison and verification. The research results show that through the model solution，the interval of global stability factor which can characterize the changing situation of global stability of slope ranges from 0.927 to 1.032，and the probability of sliding instability or failure is up to 70%. The slope，which has poor global stability and low safety level，is in an unstable state，and the tread of deformation expansion and sliding instability is obvious. In addition，the current active state of slope indicates that it has high possibility of sliding instability or failure. In order to maintain safety，stability and reliability of slope，it is noted that comprehensive treatment should be carried out for the slope. Thus it is shown that the decision-making model of multi-attribute and interval number can provide a feasible technical platform for state feedback and prevention countermeasures of slope disaster，which has positive guiding significance.
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Received: 28 February 2010
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2010, Vol. 29 
