ABSTRACT
But in the domain of optimization of tunnel and underground structure, there are many problems. Due to the complexity of tunnel and underground structure, a great many of parameters should be optimized (such as parameters of surrounding rock, parameters of support structure and decision options in constructing and so on). As to the optimization, there are problems such as multi-variable and highly non-linear, so the research and its application are still in the start stage, the references and examples are few.
