Numerical simulation on coupling method between mining-induced stress and goaf compression

JIANG Lishuai; WU Quansen; LI Xiaoyu; DING Nan

doi:10.13225/j.cnki.jccs.2016.1717

Abstract：The goaf stress recovery under the effect of overlying strata subsidence has notable effect on mining-induced stress field.Based on the coupling effect between ground stress and goal compression,the mechanical characteristics and properties back-analysis method of caved rock are studied,the tension-weakening characteristics of rock mass in fractured zone are analyzed,and hereby the coupling simulation method between mining-induced stress and goaf compression is proposed and verified using a simulation case study.The results show that the mechanical behavior of the compressed caved zone follows an exponential growth,the compression stiffness nonlinearly increases with the compression strain.The mechanical properties of caved zone obtained from back-analysis agree with the analytical results,which contribute to the simulation of the mechanical behavior of goaf.The tension-weakening model,which is developed from strain-softening model by adding the tension-weakening algorithm,can describe the weakening of Young's modulus,hereby achieve to describe the mechanical behavior of fractured rock mass rigorously.Based on the mechanical behavior simulation of caved and fractured zone,the proposed method can conduct the coupling numerical simulation of mining-induced stress field and the overlying "two-zone".