The key achievements in the shield tunneling equipment made in China and abroad in the past decade(including technologies for replacing cutters under normal pressure,technologies for intelligent diagnosis of cutter status,technologies for wearing monitoring of cutterhead and cutting tools,technologies for sealing of main bearing,technologies for extending/retracting and swinging of main drive,and technologies for free grouping of thrust cylinders)and those in the shield tunneling itself(including technologies for intelligent shield boring,technologies for shield boring under high pressure,and technologies for shield launching in steel sleeve)are summarized;the main difficulties encountered during shield tunneling,such as the damage of the cutterhead,the damage of the main bearing and the deviation of the tunnel alignment,are analyzed.Suggestion is made on the management of shield tunneling from the following four aspects:tunneling technology management,tunneling equipment management,tunneling process management and risk management.Based on the above analysis,it is believed that the shield tunneling has the following development trends:(1)the applicationof multi-mode shield for tunnel construction has become a trend;(2)shield with non-circular cross-section has become a new choice for underground space development;(3)intelligent construction will gradually become a trend in the development of shield tunnels.
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