西南某大型引水工程关键地质问题初步研究

Preliminary study on key geological problems of a large-scale water diversion project in Southwest China

西南某大型引水工程地处我国青藏高原南缘,输水总干渠长达660 km,跨越3个一级大地构造单元,地质构造背景与地震地质条件复杂。为论证工程的可行性,结合工程可行性研究阶段成果,对线路区穿越活动性断裂建筑物的抗震与抗剪断问题、隧洞涌水突泥与地下水环境影响问题、深埋隧洞关键地质问题、软岩等特殊岩土工程地质问题等进行了初步研究。结果表明,这些关键地质问题在部分线路段较为突出,但均可通过工程措施予以解决。对后续深化研究工作提出了相关建议。

A large - scale water diversion project located in south edge of Qinghai - Tibet plateau is 660 km long, which stret- ches over three geotectonic units of first - level, so its tectonic setting and earthquake condition are complex. In combination with the stage results in feasibility study, we carry out several preliminary studies on the following issues： anti - seismic and anti - shear problems of buildings in the areas of route passing across active faults, water inrush of tunnel and underground water envi- ronment problem, geological problems of deep buried tunnels, engineering problems of soft rock and other special geo - mechan- ics. The analysis results demonstrate that the above mentioned problems are prominent in local sections and could be solved by engineering measures. We put forward suggestions for further study.