Abstract Stress states and geotechnical conditions often change significantly near major geological structures (e.g. faults, shear zones, dykes) which is the cause of most major mine instabilities and/or safety hazards including coal burst, roof falls, water inrush, gas outburst, etc. In order to understand and quantify the stress state near major geological structures, an integrated study had been conducted, which included a comprehensive field monitoring program in the vicinity of a dyke in an Australian underground coal mine; detailed analysis of monitoring data to identify the stress anomalies near the dyke; and three-dimensional numerical modelling to investigate the stress distribution and the strain energy concentrations for the purpose of coal burst risk assessment. The field monitoring program included installing microseismic geophones, stressmeters and extensometers in the roadway roofs and coal pillars, aiming to obtain seismic and stress change data during longwall mining. The monitoring results indicate that the stress state was clearly different on the inbye and outbye sides of the dyke. The inbye side had a much higher stress increase than the outbye side during longwall mining. It is apparent that the dyke had caused a stress redistribution in its vicinity, which led to a stress concentration in the “hanging wall” and stress release in the “footwall”. Three-dimensional numerical modelling was conducted with both a panel-scale large model and a roadway-scale small model to investigate the stress distribution and strain energy concentration in the vicinity of the dyke during longwall mining. The modelling results agreed well with the monitoring data, further clarifying the mechanisms of the dyke influenced stress distribution.

中文翻译：

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煤矿井下主要地质构造附近应力状态监测与建模进行煤爆评估

摘要 主要地质构造（如断层、剪切带、岩脉）附近的应力状态和岩土工程条件经常发生显着变化，这是大多数主要矿井不稳定和/或安全隐患的原因，包括煤爆、顶板坠落、突水、瓦斯突出等. 为了了解和量化主要地质构造附近的应力状态，进行了一项综合研究，其中包括在澳大利亚地下煤矿堤坝附近的综合现场监测计划；对监测数据进行详细分析，以确定堤坝附近的应力异常；和三维数值模拟，以研究应力分布和应变能集中，用于煤爆风险评估。现场监测计划包括安装微震地震检波器、巷道顶板和煤柱中的应力计和引伸计，旨在获取长壁开采过程中的地震和应力变化数据。监测结果表明，堤坝入、出两侧应力状态明显不同。在长壁开采过程中，入口侧的应力增加比外侧高得多。很明显，堤坝在其附近引起了应力重新分布，导致“上墙”应力集中，“下墙”应力释放。使用面板规模的大模型和巷道规模的小模型进行三维数值模拟，以研究长壁开采过程中堤坝附近的应力分布和应变能集中。建模结果与监测数据吻合较好，