厚松散层薄基岩不同开采方式下垮落带高度探究

Study on Development Characteristics of Caving Zone of Thick Alluvium and Thin Bedrock with Different Mining Methods

为了探讨厚松散层薄基岩下不同开采方式开采二叠系山西组特厚3煤层两带发育特征,以鲍店煤矿西部所在区域为地质背景,系统分析了研究区第四系松散层下组地层组成结构、厚度和视电阻率等量化指标,对下组地层进行了再划分,可按留设防砂安全煤岩柱进行开采。在此基础上,建立了厚松散层薄基岩下3种不同开采方式的工程地质模型,获得了不同开采方式下垮落带高度、垮采比和导水裂隙带高度量化取值参数,发现沿倾向开采顶板破坏程度和高度大于走向的,综放开采引起的垮落带高度比其他开采方式的结果明显变大,其增加幅度已是第1分层开采的2.5倍。研究结果对研究区开采方式选择具有重要的参考价值。

In order to study the development characteristics of two zones of extra-thick 3 coal seam of Permian Shanxi stratum mined by different mining methods under thick alluvium and thin bedrock,taking the western region of Baodian coal mine as the geological background,the quantitative indexes of stratum composition,thickness and apparent resistivity of the lower stratum of quaternary alluvium in the study area are systematically analyzed,and the lower stratum is redivided,which can be mined by sand proof safe coal pillar.On this basis,the engineering geological model of three different mining methods under thick alluvium and thin bedrock is established,and the quantitative value parameters of caving zone height,ratio of caving and mining and water-conducting fracture zone height under different mining methods are obtained.It is found that the caving zone height caused by fully mechanized caving mining is significantly larger than that of other mining methods,the roof damage degree and height of inclined mining are greater than that of strike mining.The increase rate is 2.5 times that of the first stratified mining.Research results have an important reference value to select mining method.