Study on the effect of seepage control measures in double-barrel ultra-deep working wells of pumping stations

¹ Changjiang Institute of Survey, Planning, Design and Research, Wuhan 430010, China
² Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources, Yangtze River Scientific Research Institute, Wuhan 430010, China
³ National Dam Safety Research Center, Wuhan 430010, China

^* Corresponding author: This email address is being protected from spambots. You need JavaScript enabled to view it.

Abstract

Aiming at the problem of seepage control during the construction period of ultra-deep working wells adjacent to reservoirs, a three-dimensional seepage numerical model was established based on the working well of Qinglinjing Pumping Station in Shenzhen. The influence mechanism of reservoir water level, consolidation grouting, integrity of diaphragm wall and curtain on seepage field was systematically analyzed, and the seepage evolution laws of three excavation methods were compared. The results show that the consolidation grouting can reduce the seepage flow by 98.2 % and increase the anti-floating coefficient to 1.17 compared with the non-grouting scheme. The integrity of the diaphragm wall dominates the anti-seepage efficiency; different excavation methods have significant influence on the characteristics of seepage field during the construction of seepage wells. The results provide theoretical support for the seepage control design of deep and large shaft near reservoir.