多因素应力叠加冲击危险性评价应力增量取值实测分析

Analysis of stress increment in multi-factor stress superposition rock burst risk assessment

为了使多因素应力叠加冲击危险性评价方法中应力增量取值更加符合现场实际,对双合煤矿冲击地压多因素耦合叠加影响区域进行了分区,通过不同分区的现场实测数据分析,研究了不同分区冲击地压多因素耦合叠加及单一因素影响下的煤体应力增量。结果表明:工作面采动影响下的应力增量系数为1.73,断层构造应力增量系数为1.3,采空区覆岩传递应力增量系数1.35,见方影响下应力增量系数1.5。研究成果可为条件相似工作面或相邻工作面冲击危险性预评价中的应力增量取值提供参考,提高多因素应力叠加冲击危险性预评价的准确性。

In order to make the value of stress increment in the multi-factor stress superposition rock burst risk assessment method conform better to the actual situation,a typical working face in Shuanghe coal mine is taken as an example,the influence area of multi-factor coupling and superposition of rock burst is divided.Through the analysis of field measured data in different zones,the stress increment of lower coal body under the influence of multi-factor coupling superposition and single factor in different zones is studied.The results show that,under the mining influence,the stress increment coefficient of working face is 1.73,the increment coefficient of fault tectonic stress is 1.3,the incremental coefficient of transfer stress of overlying rock in goaf is 1.35,and the coefficient of stress increment under square influence is 1.5.The research results can provide reference for the value of stress increment in the pre assessment of impact risk of working face with similar conditions or adjacent working face,and improve the accuracy of pre-assessment of multi-factor stress superposition rock burst risk.