The traditional Retinex algorithm for low-light enhancement suffers from local halo blurring,insufficient retention of edge details,and severe noise.To solve these problems,an improved Retinex mine low-light image enhancement algorithm based on improved Retinex is proposed.The Gaussian filter in the Retinex algorithm is replaced by an improved multi-scale bootstrap filter in HSV space,the Weber-Fechner law is applied to the illumination component for illumination equalization,the contrast-limited adaptive histogram equalization algorithm is fused with the improved bootstrap filter,and contrast enhancement and denoising are performed on the reflection component.Meanwhile,adaptive stretching is performed on the saturation component,and finally converted to RGB space to obtain the enhanced image.This indicates that the algorithm effectively improves image brightness and contrast,preserves edge details while avoiding halo artifacts,reduces noise effects,and provides a theoretical reference for low-light image enhancement.
On the basis of summarizing the knowledge sources in the field of mine safety monitoring system,a domain knowledge graph was constructed in a top-down manner.The technical implementation methods of knowledge source acquisition,knowledge extraction,knowledge storage and display were analyzed.The research results were applied to the abnormal analysis of the safety monitoring system,and the T0 alarm situation of the mining face was analyzed,which demonstrating the feasibility of the technology.The research results have filled the knowledge gap between on-site technicians and coal mine safety monitoring systems,laying the foundation for the intelligent development of coal mine safety monitoring systems.
The problem of gas control in soft and thin seam with high gas content has been puzzling the safety production of coal mine,and the pre-drainage of borehole gas in this seam is one of the effective measures to solve this problem.According to the occurrence characteristics of soft and thin coal seam with high gas content in a mine in Shanxi,studies the reasonable hole sealing depth and drilling construction technology of this coal seam,and determines that the reasonable hole sealing depth of pre-drainage drilling is 18 m,and the optimal drilling construction technology is pneumatic directional drilling,which improves the gas pre-drainage concentration of this coal seam to more than 52%,improves the gas control effect of this coal seam,and provides reference for gas control of other coal seams with similar occurrence conditions.
In order to reveal the deformation mechanism of surrounding rock in the three-soft coal seam with GSER(GSER), through physical simulation experiment, the roof strata fracture evolution under the three conditions of no roof cutting general support, top cutting high-strength support, and roof cutting public support is simulated, the roof structures mechanical structure model of roof cutting GSER in the three-soft coal seam is established. The research shows that based on the overburden characteristics in the three-soft coal seam, the roof-cut technology cuts off the stress transmission, and high-strength support is adept in the roadway. Therefore, the roof can form a "short cantilever beam-voussoir beam" structure. With no roof cutting general support, the average approach distance and the floor are 1000-1200mm. The moderate approach distance of the two sides is 600-700mm. Under the roof cutting general support, the middle approach distance of the roadway roof and the floor is 800-900mm. The intermediate approach distance of the two sides is 400-500mm. Under the roof cutting high-strength support conditions, the roadway roof and floor's average approach distance is 200-300mm, and the intermediate approach distance of the two sides is 200-300mm. Under the roof cutting combined support, the middle approach distance of the roadway roof and the floor is 50-100mm. The moderate approach distance of the two sides is 100-200mm. Therefore, the combined high-strength support can better control the severe deformation of the surrounding rock of the GSER in the three-soft coal seam. The remaining roadway can satisfy secondary reuse with no repair.
为实现新疆阿艾矿区瓦斯高效治理，利用实验测试、数理统计、现场测试、理论分析等方法对矿区瓦斯赋存规律及其主控因素开展研究，研究结果表明：矿区比尤勒包谷孜背斜单元瓦斯含量普遍在8 m~3/t以上，夏阔坦向斜单元瓦斯含量分布在4～8 m~3/t，捷斯德里克向斜单元瓦斯含量分布在0～3 m~3/t。比尤勒包谷孜背斜单元瓦斯含量主要受控于高煤化作用阶段导致的良好瓦斯生成条件、强烈构造挤压超低渗效应导致的煤层良好保存条件。夏阔坦向斜单元瓦斯含量主要受控于较高煤化作用阶段导致的较好瓦斯生成条件，高惰质组含量、高吸附能力、高孔隙度导致的煤层良好储气能力。捷斯德里克向斜单元低瓦斯含量主要受控于低煤化作用阶段导致的较差瓦斯生成条件，低惰质组含量、低吸附能力导致的煤层较差储集能力，浅埋深、高透气性导致的煤层较差保存条件。
