Risk assessment criteria and method for foundation pit anchor

Taking into account the difficulty of quantitative risk assessment because of the imperceptibility of bolting project, a two-class risk assessment criteria for both the overall project and process of bolt supporting of foundation pit were proposed based on risk management experience in foundation pit anchor from engineering application point of view. In the risk assessment criteria, dangerous sources were analyzed in detail from four aspects: scheme design of foundation pit anchor, geological and hydrological conditions, surrounding environment and construction technology, process and construction capability so as to establish classifying standard for general and individual process in bolt supporting, and then corresponding risk rating was endued based on different categories among various properties. It was also applied to the engineering for verification. The results show that this method is a semi-quantitative risk assessment approach, which can obtain relevant risk rating by comparing the engineering information with the risk assessment criteria to achieve dynamic assessment and timely control of risk. Owing to its simplicity of procedure and reliability of conclusion, it is worthy of popularization and application.