Soil Nailing Project Risk Analysis

Project risk is the hotspot in recent years. But because of the peripheral environment foundation is complex and the uncertainty factors are too many, the foundation engineering construction becomes high-risk type of projects in civil engineering. Therefore, the establishment of early operation risk management system and development to prevent the insurance mechanism has become a top priority. Risk analysis theory therefore provides a feasible way. This research mainly divides into three parts.In the first part, through to the domestic cities and some excavation engineering project accident statistics and analysis, Added to the analysis of "senven to eight not to" in the poker' s "Shi dian ban", people will accept and are willing to take risks in the process of investment in certain extent. And they verify that the limits of acceptable risk that the risk threshold. And On the basis of people develop risk decision-making risk accept standard.In the second part, according to the foundation pit engineering damage from two aspects of the supporting system (its destruction and supporting system of peripheral environment destruction, to determine the destruction) using soil nailing support horizontal displacement of foundation pit occurs when coping, supporting structure and the surrounding environment risk loss risk loss and quantitative calculation rules.In the third part, according to allow maximum deformation corresponding acceptable, maximum probability of accident of soil nailing supporting structure of potential failure probability P and peak horizontal displacement of the function equation between x. Combined with practical engineering, the soil nailing support realize quantitative risk analysis of foundation pit engineering.Finally, to study the deficiencies and the direction of further work are also discussed briefly.