Measurement on Long-term Bearing Capacity and Stability of Deep Pillar

• 1、State Key Laboratory of Mine Disaster Prevention and Control, Shandong University of Science and Technology

Abstract：In order to study the long-term bearing capacity of strip pillar, a strip pillar of Daizhuang coal mine was monitored. A strip pillar stability state structure model is established accord with the engineering practice of Daizhuang coal mine, and the relationship between the stress of pillar and manometer reading is determined. The strip pillar was monitored with drilling pressure meter and automatic monitoring system for a long time. Monitoring results show that the edge of pillar can be destroyed easily, the actual maximum bearing capacity of the part which is 1m, 2m, 3m away from the edge is respectively 6.31 MPa, 6.96MPa, 9.76MPa; the actual bearing capacity at the part which is 5m away from the edge is greater than 11.90MPa. In the end of measurement term, the maximum bearing part is 6~8m away from the edge of strip pillar, and the stress of the central part of the 70m-width pillar is smaller. The bearing shape of whole pillar presents as typical saddle, so the pillar can keep stable for a long time.

Keywords： mining engineering drilling manometer strip pillar structure model long-term measurement bearing capacity