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Investigation on coal seam distribution and gas occurrence law in Guizhou, China

机译：贵州省煤层分布及瓦斯赋存规律研究

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摘要

In order to enhance the management level of coal mine safety production and promote the safe, accurate and efficient preventive treatments for gas in Guizhou of China, the occurrence and other prominent features of coal and gas are investigated. The characteristics and regularities of coal mine accidents in Guizhou during 2001-2015 are summarized to analyze the commonness of gas accidents in general and determine the characteristics of gas preventive treatment. Geological data, gas basic parameters, and physical properties of coal of 386 mines and 761 sets of coal seams in Guizhou are also statistically analyzed. Based on step control theory of gas occurrence structure and the regionally tectonic regularity of coal-bearing stratum distribution, the deformations of coal measures in Guizhou mine area are mainly caused by great variation of stratigraphic occurrence, complicated geological structure, and high crustal stress. The regional occurrence of coal seam is obvious with the highest content of Tongzi-Zunyi-Liuzhi-Xingyi line, which gradually reduces to the both east and west sides. Influence factors and weights of gas occurrence are expounded from geological and coal factor by mathematical statistics, and the main influence factors of gas occurrence are the sedimentary environment, syncline structure, and metamorphic grade in proper sequence. Combined with the risk prediction of coal and gas outburst area, the prediction of gas pressure by gas content is not suitable under the special occurrence conditions. The initial velocity of gas emission, the solidity coefficient, and the damage type in more than 77% of minable seams all exceed the critical value. This work provides guidance in improvement of the governance situation for gas control in Guizhou. The index prediction system which is suitable for mining conditions of special coal mines in Guizhou should be established.
机译：为了提高煤矿安全生产的管理水平，促进我国贵州瓦斯的安全，准确，高效的预防，对煤矿瓦斯的发生及其他突出特征进行了调查。总结了2001-2015年贵州煤矿事故的特点和规律，分析了一般性瓦斯事故的普遍性，确定了瓦斯预防措施的特点。还对贵州386座煤矿和761套煤层的地质数据，瓦斯基本参数和煤的物性进行了统计分析。基于瓦斯发生结构的阶跃控制理论和含煤地层分布的区域构造规律，贵州矿区煤系的变形主要是由地层发生变化大，地质构造复杂，地壳应力高引起的。煤层的区域性明显，童子-遵义-柳枝-兴义线含量最高，向东，西两侧逐渐减小。通过数理统计从地质和煤成因两方面阐述了瓦斯发生的影响因素和权重，主要影响因素是沉积环境，向斜构造和变质等级。结合煤与瓦斯突出区域的风险预测，在特殊的发生条件下，用瓦斯含量来预测瓦斯压力是不合适的。超过77％的可采煤层中瓦斯涌出的初始速度，固结系数和破坏类型均超过了临界值。这项工作为改善贵州天然气控制治理状况提供了指导。建立适合贵州特殊煤矿开采条件的指标预测系统。

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