Abstract: the occupational exposure assessment in our country is in its infancy, most of them are in the stage of qualitative and semi-quantitative evaluation.
摘要：我国职业暴露评估正处于起步阶段，大部分都处于定性和半定量的评价阶段。
In the paper, a semi-quantitative evaluation method is provided for the minimum safe thickness of the floors of the karst tunnels by means of the load transferring line concept;
采用荷载传递线的概念，提出了岩溶隧道底板最小安全厚度的半定量评价方法；
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