地层的基础上，针对黄土隧道盾构施工，提出“湿陷性新黄土地层二元结构”，结合‘西安轨道交通地铁二号线盾构施工地面沉降监测’数据，采用数值模拟计算与理论分析，揭示湿陷性新黄土层盾构施工的变形规律，指出：在新黄土上元非饱和地层中盾构施工，与一般地层比较地层变形具有五个阶段，地层沉降变形主要影响因素是地层损失、盾尾注浆黄土湿陷和固结变形，地层变形存在湿陷突变脆性破坏；同时，与上元非饱和黄土结构相比较，下元饱和黄土盾构施工地层变形是地层损失，不存在盾尾注浆黄土湿塌的沉降突变，在上元非饱和黄土结构稳定区域产生“压力拱”，约束下元结构的沉降变形。在分析施工掌子面稳定极限状态基础上，通过数值计算分析和施工监测，认为在盾构施工过程中，盾构施工围岩地层存在三区（挤压区、剪切区和松动区），黄土盾构施工影响范围在10~30％D。High-Speed Rail Construction Drives Rapid Growth of Domestic Piling Machinery
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