煤层节理在煤层中普遍发育，它不仅是矿井构造研究的重要内容，同时也是极其重要的工程地质因素。
Coal bed joints are a widespread structure in coal beds. They are important objective in study of shaft structure and also a very important engineering geological factor.
煤层节理在煤层中普遍发育，它不仅是矿井构造研究的重要内容，同时也是极其重要的工程地质因素。
Coal bed joints are a widespread structure in coal beds. They are important objective in study of shaft structure and also a very important engineering geological factor.
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