Study of quantitative risk index of metro tunneling-induced effects on surroundings

The safety risk evaluation of metro tunneling-induced effects on adjacent buildings and structures is one of the problems urgently to solve. Considering the interval distribution characteristic of ground parameters in engineering, the interval analysis theory is suggested to estimate the interval of the response of buildings and structures. Based the response interval, a risk index 1. is defined by introducing the risk evaluation function; and the other risk index 2. is defined by assuming the response is the uniform distribution. With the two risk indexes, the event that whether the buildings and structures adjacent tunneling are safe or not is classified into the impossible event, the risk event and the sure event. The risk event is further classified into 3 classes, and responding measures are recommended. In the end; the application of the defined risk indexes to engineering is explained in an example.