A Model to Estimate the Height of the Water-conducting Fracture Zone for Longwall Panels in Western China
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TECHNICAL ARTICLE
A Model to Estimate the Height of the Water‑conducting Fracture Zone for Longwall Panels in Western China Xiang He1,2 · Yixin Zhao1,2,3 · Cun Zhang1,2 · Penghua Han1,2 Received: 25 November 2019 / Accepted: 21 September 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract 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 40 20–40
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