巷道顶板 meaning in English

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Roof control technology of mining roadway in 2 coal seam in liyazhuang colliery
煤层回采巷道顶板控制技术研究
The development and application of new - type detector of roadway roof strata structure
新型巷道顶板岩层结构探测仪的研制和应用
Application of the intelligent monitoring and warning system for the tunnel roof pressure
巷道顶板压力智能监测报警系统的应用
Evaluation of safety performance of soft rock roadway roof using neural network method
运用神经网络方法评定软岩巷道顶板安全性
The results show that the full - azimuth 3 - electrods electrical soundings can find out the geometrical shape and water content of the geological abnormal body , and make clear its hydrological relation with the main water containing layers
结果表明，采用巷道顶板、底板及侧帮电测深的全方位测深模式能够查明地质异常体的空间赋存形态、富水性以及与顶板或底板含水层是否存在水力联系等。