为探索超大断面马蹄形盾构盾体载荷分布特性，解决超大马蹄形盾体设计关键技术问题，针对适用于单洞双线铁路隧道的超大马蹄形盾构护盾薄壳体轴向、周向载荷分布特性和传递规律展开研究，构建了盾体受载数学模型。基于上述载荷分析与功能需求详细探究了超大断面马蹄形盾构盾体的结构设计，明确了马蹄形盾体受力的薄弱环节，通过三维建模和有限元分析优化了盾体结构： 壳体结构采用多半分体组合式结构，并通过法兰连接，满足了吊装和运输要求； 壳体箱型环梁结构设计，在保证结构强度要求的同时节省了材料、减轻了质量； 此外，进行了盾体的梭式结构、帽檐设计和超前注浆通道设计等针对性设计，有效提高了马蹄形盾构的适应能力。该马蹄形盾构的应用和盾体变形工业性监测试验表明，马蹄形盾构盾体结构满足整机平稳掘进、盾体微变形的要求，也印证了该数值模拟分析方法的正确性。

The exploration of shield load distribution rule of large crosssection horseshoeshaped shield and the key design technologies are very important. The axial and circumferential load distribution and transmission rules on shield of large crosssection horseshoeshaped shield used in singletube doubleline railway tunnel are studied; and the numerical model of shield load is established. And then the shield structural design is discussed; the weak point of shield loading is identified; and shield structure is optimized by 3D modeling and finite element analysis. The optimization of the shield structure includes using split combined structure and flange connection to meet the requirements of hoisting and transportation; the beam structure design of box type shell ring ensures the strength requirements, saving material and reducing weight; in addition, the shuttle structure, brim design, advance grouting channel design improve the horseshoeshaped shield’s adaptability. The application of the horseshoeshaped shield and industrial deformation monitoring results indicates the feasibility of the shield system and the validity of the numerical analysis method.