Research on the surface movement rules and prediction method of underground coal gasification
Research on the surface movement rules and prediction method of underground coal gasification
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DOI：
10.1007/s10064-015-0809-7
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发表时间：
2016-08
影响因子：
4.2
通讯作者：
Huaizhan Li;G. Guo;Jianfeng Zha;Yafei Yuan;Bin-chen Zhao
中科院分区：
文献类型：
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作者：
Huaizhan Li;G. Guo;Jianfeng Zha;Yafei Yuan;Bin-chen Zhao
随着煤炭地下气化技术的不断发展，煤炭地下气化逐渐走向商业化发展。然而，关于煤炭地下气化引起的上覆岩层和地表移动规律的实测数据和相关研究却十分有限，严重制约了煤炭地下气化的进一步应用。为解决煤炭地下气化开采地表沉陷预测问题，采用FLAC3D数值模拟软件，研究了UGC条带开采与条带开采覆岩和地表移动规律的差异，以及不同采出率下预测参数的差异。该模型是根据我国煤炭地下气化试验区的地质和开采条件建立的。研究结果表明，地下连续采煤与条带开采的覆岩和地表移动规律相似。因此，地下连续采煤法地表沉陷预测可作为条带开采地表沉陷预测方法的参考。不同开采率下地表移动极值的差值小于5mm，地表下沉边界的差值小于10m。因此，地下连续采煤法地表沉陷预测参数可作为条带开采的相应预测参数。最后，在上述研究成果的基础上，提出了地下连续采煤法地表沉陷预测方法，并编制了预测软件进行工程应用。研究成果对推动煤炭地下气化技术的应用具有重要的理论和现实意义。
With the continuous development of the technology of underground coal gasification (UGC), it gradually moves into commercial development. However, there is limited measured data and related research on the overlying strata and surface movement rule caused by underground coal gasification, which has severely restricted the further application of underground coal gasification. In order to solve the problem of surface subsidence prediction of underground coal gasification, this numerical simulation software, FLAC3D, is adopted to study the differences of overlying strata and the surface movement rule of UGC strip mining (UCG mining) and strip mining, and the differences of prediction parameters under different recovery ratios. The model is established according to the geological and mining conditions of the underground coal gasification experiment area in China. The research results show that overlying strata and surface movement rules of UCG mining and strip mining are similar. So, the surface subsidence prediction of UCG mining can refer the prediction method of strip mining. Meanwhile, the difference values of surface movement extrema under different recovery ratios are less than 5 mm and the difference values of surface subsidence boundary are not more than 10 m. Therefore, the surface subsidence prediction parameters of UCG mining can be chosen as the corresponding prediction parameters of strip mining. Finally, the surface subsidence prediction method of UCG mining is proposed based on the above research results and prediction software is compiled for engineering application. Research results have important theoretical and practical significance for promoting the application of underground coal gasification.