内蒙黄玉川煤矿4#煤层顶板稳定性评价

Stability assessment of No.4 coal seam's roof in Huangyuchuan coal mine of inner Mongolia

煤层顶板稳定性是影响煤矿安全生产的主要因素之一。通过分析影响顶板稳定的地质因素,运用岩石力学、分形理论以及沉积岩石学等方法,结合钻孔、地震资料选取定量评价指标,在AHP—模糊综合评价模型的基础上,应用Mathematica对4煤顶板进行了综合分区。结果表明:煤层顶板稳定性主要由顶板岩石力学性质和构造发育程度控制;研究区4煤顶板以泥岩、粉砂质泥岩为主,岩石力学强度低,小构造较发育,顶板完整性差,将顶板分为极不稳定、不稳定、较稳定和稳定四类。首采区中部顶板构造较复杂,岩石力学性质差,多为不稳定、极不稳定型顶板;东南部稳定性较好,利于大采高综采生产。

The roof stability of coal seam is one of the major factors concerning coal mine safety production.Base on the Analytic Hierarchy Process（ AHP） and the Fuzzy Synthetic Comprehensive Evaluation Model,a comprehensive assessment of 4 # coal roof is made with the assistance of Mathematica. The assessment is conducted through the theoretical analysis of geological factors that affect roof stability,with the application of such methods as rock mechanics,fractal theory and sedimentary petrology etc. as well as the selection of quantitive assessment criteria on drill hole and seismic data. According to all the researches above,it is found that the roof stability is mainly determined by mechanical properties of the roof rock and the degree of structure-development. The research area of 4 #coal roof is mainly mudstone and silty mudstone,which is of low mechanical strength with relatively numerous minor scaled structure and poor roof integrity. Four types of stability are thus classified,known as extreme-instability,instability,relative-stability and stability. The roof in the central section of the chief mining-district is mainly of instability and extreme-instability types with relatively complex structure and poor mechanical properties,while the southeastern section is of preferable stability which is conducive to mechanized mining production.