多因素应力叠加冲击危险性评价应力增量取值实测分析

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。

Evaluation method of multi factor stress superposition impact risk

In order to make the value of stress increment in the method of multi factor stress superposition impact risk assessment more in line with the actual situation of the site, the stress measuring points of coal body are arranged in the different influence areas of different factors along the working face, the change of stress of coal body under different influence factors of impact pressure of the test working face is measured, and then the maximum stress increment of coal body under single influence factor is analyzed, which can be used for similar work The value of stress increment in the face impact risk pre evaluation can provide a reference to improve the accuracy of the impact risk pre evaluation. According to the actual measurement and analysis of the test working face, the maximum stress increment under the influence of "square" of the working face is about 2.50mpa, the maximum stress increment under the influence of the side bearing pressure of the goaf is 1.75mpa, the maximum stress increment under the influence of the fault structure is about 1.5MPa, and the maximum stress increment under the influence of mining is about 3.65mpa.