论文部分内容阅读
在基于相似模拟试验思想和地质力学模型试验新思路的基础上,在实验室搭建大型石门揭煤的煤与瓦斯突出试验平台,利用该试验平台研究石门揭构造软煤过程中煤岩应力的变化规律,同时结合数值模拟分析地应力在石门揭构造软煤诱发煤与瓦斯突出中的作用。结果表明:在石门揭煤过程中巷道前方围岩存在明显的应力集中,使煤体中积聚弹性潜能,增加煤体的瓦斯压力梯度,为突出的准备和孕育提供能量基础;发现地质构造断层附近存在明显的构造应力异常区并与由后期开挖导致的应力集中相互叠加,有利于形成自构造软煤向周围煤层深部扩展的大型突出。
Based on the idea of similar simulation and the new idea of geomechanical model test, a coal and gas outburst testing platform for large-scale crosscut coal blasting was established in the laboratory. The test platform was used to study the changes of coal and rock stress during the construction of soft coal in Shimen Jie Law and combined with numerical simulation to analyze the role of in-situ stress in coal and gas outburst caused by soft coal in Shimen exposing. The results show that there is obvious stress concentration in the surrounding rocks in front of roadway in the process of rock uncovering so that the elastic potential of the coal accumulates and the gas pressure gradient of the coal body increases to provide the energy foundation for outstanding preparation and gestation. The existence of obvious tectonic stress anomalies overlaps with the stress concentration caused by late excavation, which is favorable for the formation of large-scale prominence from the soft coal to the deep surrounding coal seams.