Based on that, the formulae of lithology factor and time factor of load transmitting were established. By means of these formulae, the problem of load calculation for roof key block can be solved.
提出了载荷传递因子的概念，给出了卸荷拱高度的计算公式和载荷传递因子的计算公式，解决了关键块上的载荷计算问题。
Factor of soil circumstance was an index of rocky desertification type and indicated the spatial difference of lithology.
土壤环境因子表征了石漠化在空间上岩性的差异特征，是石漠化类型的表现指标。
In Tazhong Area, the main factor of impacting average velocity is the depth of stratum and lithology of igneous.
在塔中地区，影响平均速度的主要因素是地层埋深和火成岩的岩性。
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