Analysis of the Interaction and Deformation and Failure of the Construction of Deep Soft Rock Chamber Group
The slip breaking system of underground mine has a long service life,which involves many large section cham-bers such as unloading and crushing.In order to solve the problem of complex deformation and failure characteristics of sur-rounding rock caused by mutual influence during the construction of chamber group,taking the chamber group of-550～-590 m horizontal slip breaking system in Zhongjiu Iron Mine as the engineering background,the extent of the plastic zone in a chamber was obtained based on elastic plasticity theory.The eight large-section chamber numerical models of ore and waste rock unloading chamber,lower chute,crushing chamber and ore storage chamber were constructed.The spatial and temporal distribution characteristics of surrounding rock stress and deformation during single chamber construction and sequential cham-ber group construction were analyzed.The mutual influence of chamber group construction was studied.The deformation control program was proposed based on this.The results show that with the sequential construction of the chamber group of the slip breaking system,the maximum deformation of the waste rock crushing chamber,the unloading ketone chamber and the side of the ore storage silo increases linearly,and the plastic zone of the side increases first and then remains basically unchanged.The completed chamber group makes the rock mass quality of the subsequent construction chamber area worse.Compared with the construction of a single chamber,the deformation of the side is increased by 21.7%and 53.4%respectively,and the plastic zone is increased by 32%and 92%respectively.The study results can provide guidance for the subsequent chamber construc-tion and support design of Zhongjiu Iron Mine,and also have a certain reference significance for the study on the mutual influ-ence of construction of similar mine chamber groups.
cavern groupmutual effectstability of surrounding rocknumerical simulation
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