A boom-type roadheader, a type of mechanical equipment used in the excavation of coal mines, has been used for the construction of a metro tunnel with complex cross-sections. The adaptability of this equipment directly depends on the mechanical behavior of surrounding rocks and the associated construction method. Practice has indicated that a boom-type roadheader is suitable for bench excavation without a temporary invert. The mechanical characteristics of surrounding rocks affecting the efficiency of such boom-type roadheaders include u-niaxial compressive strength and fissure spacing of the rock mass. The adaptability of the boom-type roadheaders is divided into 3 classes based on these characteristics. The problem of dust generation in the tunneling process can be solved by changing ventilation modes. Primary support and mucking are additional factors affecting the efficiency of the boom-type roadheaders. A high-strength resin anchoring bolt system and continuous mucking system pair with the boom-type roadheader very well. Through an application analysis of boom-type roadheaders, the adaptability of boom-type roadheaders in metro tunnels with complex cross-sections is discussed. Factors and problems affecting the efficiency of boom-type roadheaders are highlighted.%悬臂掘进机是应用于煤矿煤巷掘进的综合机械化掘进设备,将其应用于复杂断面的地铁隧道之中,其适用性与围岩的力学特性和施工工法有直接关系.工程实践研究表明,悬臂掘进机适用于无临时仰拱的台阶法开挖,影响悬臂掘进机掘进效率的围岩力学特性指标主要有:岩石的单轴抗压强度和围岩的裂隙间距,按照这2个指标可将悬臂掘进机的适用性分为3级；掘进过程中所产生的粉尘可通过改变通风方式来解决.除此之外,影响悬臂掘进机掘进效率的因素还有:初期支护方式和出碴运输方式,高强树脂锚固锚杆支护系统和连续运输出碴系统是否与悬臂掘进机较好的匹配.通过对悬臂掘进机在实际工程中应用情况的分析,探索了在复杂断面地铁隧道之中应用悬臂掘进机的适用性和影响悬臂掘进机掘进效率的因素以及存在的问题,且在实际工程中得到了验证.
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