Water Supply Project in the Central City of Jilin Province is a large scale project which involves complex geological condition and high technical difficulties. In order to maximize the water delivery, the overlength pressure hydraulic tunnel is introduced. Based on detailed geological survey and other reliable technical references, this project can be treated as a demonstration in terms of how to lay large diameter TBM through a karst area with limestone. The insitu test is introduced to test the nonbonded prestress circumferential anchor tunnel structure and culvert structure when the water transmission engineering line crosses the shallowburied valley section. The Class Ⅰ and Class Ⅱ granite tunnels excavated by TBM is not aligned with saving project investment and speeding up construction progress. The BQ method is introduced to analyze the rock quality classification of long tunnels. There are not many domestic engineering examples of the abovementioned key technologies, and there are no mature theories and experiences to refer to. Based on theoretical research, numerical calculations, model tests, and productive insitu tests, those key technical problems of ultralong and pressurized tunnels are solved. This project has a great theoretical and engineering value.

目前国内输水工程线路穿越浅埋沟谷段进行后张法无黏结预应力环锚隧洞结构和涵洞结构的现场原位试验工程实例不多，节省工程投资和加快施工进度采用TBM开挖的Ⅰ、Ⅱ类花岗岩隧洞不衬砌技术的成功案例较少。吉林引松工程在规模大、地质条件复杂、技术难度高建设条件下采用超长有压引水隧洞，利用BQ法进行长大隧洞岩石质量分级对比分析，通过理论研究、数值计算、模型试验和生产性原位试验，解决了超长有压隧洞关键技术问题。工程建设中采用的岩溶地质勘察和可靠的技术手段，可为大直径TBM穿越灰岩岩溶地区方案布置提供借鉴意义。