English translation for "顶板周期垮落"

roof periodic caving

Related Translations:

自然垮落:  spontaneous caving

顶板阶梯:  roof step

顶板撑:  crown stay

外顶板:  roof sheet

顶板裂缝:  roof fissure

平巷顶板:  roof of drift

货架顶板:  deck board

岩层顶板:  top of bed

人工顶板:  artificial roof

弱顶板:  poor roof

Similar Words：

"顶板支架" English translation, "顶板支梁" English translation, "顶板中薄煤夹层" English translation, "顶板中的煤夹层" English translation, "顶板中钟形结核" English translation, "顶板状况" English translation, "顶板钻头" English translation, "顶板坳陷" English translation, "顶板蜿曲" English translation, "顶版" English translation