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    Risk assessment for the safe grade of deep excavation
    
    
    
    
        
                    
                X. H. Bao;                    
                H. W. Huang                
            
        
        IS SHANGHAI '08
    
            
    
    4.Safety issues, risk analysis harzard management and control
    
            
                    
               Risk & Reliability,                     
               Deep Excavations