safety of construction procedure of shield tunnel with tunnel boring machine(TBM).

safety of construction procedure of shield tunnel with tunnel boring machine(TBM). Write a research paper with focus on safety of construction procedure of shield tunnel with tunnel boring machine(TBM). publish this paper in a good journal with impact factor 1.2.. in this paper I have a reference for safety factors in construction of tunnel with TBM that i will attach it. find a real accident during the construction of tunnel with real reference for last two years and then analyze it with these factors. after that find the most important factor and find good solution for that.