重复采动条件下覆岩下沉特性的研究

现场观测及实验室试验结果表明采动岩体碎胀量与深厚比成正比，据此得出了初次采动时地表及岩体现人部下沉系数计算式，同时，根据受初次采动影响的岩体在重复采动时碎胀量减小，假定减小量与初次采动碎胀量成正比，推出了预测重复采动条件下地表及岩体内部下沉系数的计算式，并可由现场实测得出有关参数，经与３６个初采观测站资料和１０个重采观测站资料的实测资料对比，证明了所给公式的正确性。

THE STUDY ON THE CHARACTER OF STRATA SUBSIDENCE DURING REPEAT MINING

The results of the field observation and lab. experiment show that the bulking of mining rock mass is directly proportional to ratio of mining depth and mining thickness. Based on this, the calculation formula of subsidence coefficient on the surface and strata subsidence in the first mining is obtained.Based on the fact that the bulking of the rock mass which was influenced by first mining, will be smaller during second mining, and suppose the reduced quantity is proportional to the bulking during first mining, the calculation formula for predicting subsidence coefficient on surface and inside rock mass under second mining condition is derived, the concerned parameters are obtained from site measurement. The given formula is proved to be correct through its comparison with field data from 36 first mining and 10 repeat mining observation station.