2Study and trial on explitation of retaining safety coal pillar against sand under medium-thickness aquifer layer342-346
3Analysis of superiority of tunnel arrangement new mode in coalbed group with the small inclination347-351
4Re-understand the technology of reducing the subsidence due to mining by injecting grouts into separated beds in overlying disrupted strata by extraction352-356
6Analysis of model in series and parallel of rock bolt reinforcement system and its reliability computation361-365
9Monitoring the seeper subside in coal district by the remote sensing——examples from Huainan coal district374-378