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。
In Tazhong Area, the main factor of impacting average velocity is the depth of stratum and lithology of igneous.
虽然目前难以求得数值特解，但可用图解表示岩席应变状况、构造变形特点，估算拆离滑脱带最大埋深和计算盖层的绝对缩短量。
Although it is difficult to get numerical solution up to date, the sheet strain and the characters of the structural strain can be illustrated by graphic solutions.
以煤层上覆岩层组成、长壁回采工作面覆岩活动规律、煤层埋藏深度作为浅埋煤层开采界定指标，论证了指标合理取值。
The reasonable definitional feature of shallow coal seam is analyzed base on the overlying strata's composition, the activity law long-wall mining'soverlying layers and the depth of coal seam.
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