摘要:
基于淮北矿区粉煤灰离层充填开采工程实践,为了查明粉煤灰离层充填体的赋存空间、水平与垂向运移通道、溶质在采动条件下的扩散特征,运用示踪试验和数值分析方法,对离层注浆液的储存位置、运移通道和溶质扩散特征进行了研究,研究发现离层等采动裂隙随工作面的推进而动态演化,粉煤灰浆液主要集中在离层带中,少量浆液通过采动裂隙和构造裂隙进入采掘空间,浆液对地下水的影响范围随时间的变化而逐渐减小,影响程度逐渐减弱。研究结果表明:试验矿井的导水裂隙带达到峰值并逐渐稳定后,顶板63~77 m上部区域出现了大面积的水平离层区,是粉煤灰充填体主要储存空间;粉煤灰浆液受地下水的稀释和净化作用,注浆20年后基本消除浆液对地下水水质的影响。
Abstract:
Based on engineering practice of abscission layer mining with flling in Huaibei Mining Area, in order to find out the spatial relationship of flling body of fl y ash in abscission layer, horizontal and vertical migration pathways and solute diffusion characteristics under the condition of coal mining by using the methods of trac er test and numerical analysis, the author studied the storage space, transmitting pathway and solute diffusion characteristics. Results showed that with the advancing of workface, the mining fracture was evoluted dynamically, fly ash slurry was mainly concentrated in the abscission zone, a small amount of slurry was poured into mini ng space by mining fissures and structural fissures. The influence scope of the slurry on the ground water decreased gradually with the change of time, and the effect d egree decreased gradually. Results also showed that, 63 ~ 77 m region of upper roof appeared horizontal abscission zone with large area, which was the main storage space of fly ash flling body. Affected by dilution and purification of groundwater, with 20 years' grouting, the influence of slurry on the quantity of groundwater could be eliminated.
百度学术
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