Concerted efforts were made by Kamoya project in May to successfully pass through the fissure aquifer during the development of LV decline and 1110mL backfill vent drift, with monthly target overfulfilled, marking a stage victory for UG water control.
LV decline (2890m long) and 1110mL backfill vent drift (560m) were both exposed to the threat of long-distance aquifer during development works, due to complicated hydro-geological conditions such as cavern water, fissure water and weak breccia.
To address such issues, the project prepared effective plans under the support of the headquarters and JCHX Overseas Divisions, with the management team and engineers frequently inspecting working site and proactively communicating with the Employer, to adjust design and change the ground support method. Then stage victory was attained regarding UG water inrush by applying cover drilling and construction method of "closely-integrated exploring, drilling, and grouting", which laid a solid foundation for overfulfilling the monthly target and provided valuable experiences for future grouting and water sealing under special rock conditions.
