Abstract: There are numerous small scale and unregulated abandoned coal and clay mineral mines in Zhangqiu City of Jinan. The backfill shafts were identified within the footprint of the proposed industrial building after the foundation excavation. The geophysical instigation using direct current induced polarization sounding was used to estimate the limits of the abandoned mine areas. The geophysical exploration results were verified by the conventional boring method. Based on the geophysical and geotechnical drilling results, the abandoned mining voids were compaction grout treated.

Key words: Coal Mines, Mined Out Area, Direct Current Induced Polarization Sounding, Boring Verification