A Model to Estimate the Height of the Water-conducting Fracture Zone for Longwall Panels in Western China,Mine Water and the Environment

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A Model to Estimate the Height of the Water-conducting Fracture Zone for Longwall Panels in Western China
Mine Water and the Environment ( IF 2.8 ) Pub Date : 2020-10-08 , DOI: 10.1007/s10230-020-00726-2
Xiang He , Yixin Zhao , Cun Zhang , Penghua Han

Accurate prediction of the height of the water-conducting fracture zone (WCFZ) is very important for safe coal mining, water resource storage, and protecting the environment. The proportion coefficient of hard rock and the actual height of the top caving coal were defined to predict the height of the WCFZ more accurately. A multivariate regression analysis method was adopted to establish a nonlinear model for predicting the height of the WCFZ based on various factors, including mining height, panel width, proportion of hard rock, mining depth, and extraction rate. Investigations conducted using data from western China show that the ratio of the height of the WCFZ to the mining height obtained using the actual height of the top caving coal is ≈ 20, which is consistent with the distribution of the longwall full-seam mining technology. The values predicted by the multiple regression model in this study are closer to the measured values than those derived using traditional empirical equations, with a relative error < 10%. The ratio of the height of the WCFZ to mining height was generally higher in the western mining area than in the eastern mining area, due to the increase in panel dimensions and harder lithology. However, the influences of extraction rate and mining depth on the development of the WCFZ were found to be relatively weak. Finally, the model accurately predicted the height of the WCFZ in panel 12,511 of the Bulianta coal mine.

更新日期：2020-10-08

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