1) safety roof
安全顶板
1.
The thickness reduction method in forecasting the critical safety roof thickness of gob area
采空区临界安全顶板预测的厚度折减法
2) safety thickness of roof
安全顶板厚度
1.
Mathematical forecasting model of safety thickness of roof for mining orebody under the complicated backfilling;
充填体下矿体开采安全顶板厚度数学预测模型
3) safe thickness
顶板安全厚度
1.
Studies on numerical manifold method for determination of safe thickness of karst roof in roadbed;
公路路基岩溶顶板安全厚度确定的数值流形方法研究
5) least security coping thickness
最小安全顶板厚度
1.
Through the comparisons, the reasonable least security coping thickness is obtained.
通过比较得出最合理的最小安全顶板厚度 ,对同类工程有很大的参考价
2.
According to axis geologic charts and tunnel axis distribution charts, the least security coping thickness for an underwater highway tunnel is researched.
根据轴线地质剖面和隧道轴线布置图,对某拟建中水下公路隧道最小安全顶板厚度的确定进行了研究,通过比较得出最合理的最小安全顶板厚度,对同类工程有很大的参考价值。
6) mounting of roof plate
顶板安装
补充资料：安全
没有危险；不受威胁；不出事故：～操作ㄧ～地带ㄧ注意交通～。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条