For the water conveyance tunnels in the longdistance water diversion projects constructed or planned in China, most of them have to pass through mountain areas with complex geological conditions, due to the constraints of route selection. These tunnels might face engineering problems such as harsh natural environment, high seismic intensity and steep terrain, leading to difficulties in construction and high operational risks. In this paper, some key technical issues on the construction of ultralong deepburied water conveyance tunnels under complex geological conditions are summarized into 5 aspects, namely, (1) exploration and testing techniques for deepburied tunnels, (2) prediction and prevention for large deformation and rock burst in the surrounding rock masses, (3) failure mechanism and antifaulting techniques of the surrounding rock masses and lining for tunnels crossing active faults, (4) synergistic loadbearing mechanism and lifecycle design theory for rocksupport system of deepburied tunnels, (5) disaster treatment for deep and long tunnels such as prevention of highpressure water inrush. The scientific and technical problems to be solved and their development directions are pointed out, which can provide some reference for engineering construction of ultralong deepburied tunnels.

我国兴建或拟建的若干长距离调水工程中的调水输水隧洞受选线制约，多要穿越地质构造背景复杂的山岭地区，面临自然环境恶劣、地震烈度高、地形地质条件复杂等诸多不利因素，工程建设难度及运营风险大。总结复杂地质条件下跨流域调水超长深埋隧洞建设需研究的关键技术问题，包括深埋隧洞工程的勘探、试验及测试技术，深埋隧洞围岩大变形及岩爆预测与防控技术，隧洞穿越活断层围岩-衬砌灾变机制与抗断技术，深埋隧洞围岩-支护体系协同承载机制与全寿命设计理论及方法，高压水害等不良地质条件下深埋长隧洞施工灾害处治技术5个方面，指出需要解决的工程科学技术问题及发展方向，为超长深埋隧洞工程建设提供一些参考。