中文摘要：

为研究长壁留煤柱采空区系统荷载传递规律,采用改进矩阵力法并结合数值模拟对煤柱群-顶板结构荷载传递规律进行研究。以某煤矿长壁留煤柱开采为例,采用改进力法,即支反力F取代等效弯矩Xn,建立了煤柱群-顶板力学模型;结合数值模拟研究局部煤柱承载力衰减对临近煤柱承载力影响规律,以及煤柱群-顶板整体系统塑性区域扩展和应力分布规律。结果表明：1）随局部煤柱承载力衰减,荷载逐渐转移到周围煤柱之上,临近煤柱分担荷载最多,相隔煤柱受到的影响较小;2）若相邻煤柱因转移荷载而压溃,则荷载将进一步向外转移扩散,影响煤柱顶板系统整体稳定性;3）荷载转移率是影响煤柱群-顶板结构稳定性的重要因素,当各个煤柱承载力较为均衡时,荷载转移率较高,与力法分析结果相近。当转移荷载过大时,顶板围岩也参与到分担转移荷载的工作中,顶板围岩系统稳定性影响非常大,很可能在未导致临近煤柱失稳时,该处局部顶板已经发生了垮落,对整体稳定性产生威胁,这不但与荷载转移率有关,也与顶板围岩性质密切相关,也是继局部煤柱失稳后威胁煤柱群-顶板整体系统稳定的原因所在。

英文摘要：

The paper is devoted to a study of the load transfer regularity of the long protective wall sustaining coal pillar goaf system by taking the longwall coal pillars exploitation in Baiyangling coal mine as a case study sample.For the study purpose,we have adopted a renovated matrix force method and the numerical simulation method to explore the load transfer mechanism of the coal pillars-roof structure and established a dynamic model of the coal pillars-roof with an improved force method,that is,with the reaction force F to substitute the bending equivalent moment Xn.In addition,we have also studied the influential regularity of the sustaining capacity in the adjacent coal pillars,the plastic zone extension of the entire coal pillar-roof system and the stress distribution regularity through an integrated numerical simulation,in addition to the local pillars bearing capacity decay.The results of the above said simulated study have shown that：（1） with the decay of the bearing capacity of the local coal pillars,the rock load may tend to transfer gradually to the surrounding coal pillars,with the adjacent coal pillars jointly sharing the maximum load,which makes the effect of alternative coal pillars a bit less;（2）in case the adjacent coal pillars turn to be squashed due to loadtransference,the load would be further propagating outwardly and then affect the stability of the entire coal pillar-roof system;（3）moreover,the load transfer rate can also be an important factor to influence the stability of the coal pillar-roof structure.For example,if the bearing capacity of the coal pillars is relatively balanced,the load transfer rate may turn to be higher and much the same as is done by the force method analysis;however,if the transfer load becomes too great,the roof rock above the coal pillars may also be involved with the stress of load transfer sharing,which may also influence seriously the stability of the roof surrounding rock system.And,if it cames to the extreme extent,the local roof may get collapsed,