Abstract: In order to study the long-term bearing capacity of strip pillar, a strip pillar of Daizhuang coal mine is monitored. A strip pillar stability state structure model is established according with the engineering practice of Daizhuang coal mine, and the relationship between the stress of pillar and manometer reading is determined. The strip pillar is 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, and the actual maximum bearing capacity of the part which is 1，2，3 m away from the edge is respectively 6.31，6.96，9.76 MPa; the actual bearing capacity at the part which is 5 m away from the edge is greater than 11.90 MPa. In the end of field research, the maximum bearing part is 6~8 m away from the edge of strip pillar, and the bearing capacity of the central part of the 70 m-width pillar is smaller. The bearing shape of whole pillar presents as typical saddle during the whole period of the research, which indicates the pillar can keep stable for a long time.

Key words: drilling manometer, strip pillar, structure model, long-term field research, bearing capacity