利用所编写的非稳定渗流计算程序，计算土石坝上游水位变化时自由面位置随时间的变化规律、孔隙水压力的分布情况。
The program is utilized to calculate soil rocks dam free surface position variation and pore-water pressure distribution condition with time when the up water level position changed.
压力是内弹道的基本指标，压力随时间变化的曲线可以表征内弹道的情况。
Because the pressure is a key feature of the internal ballistic inside, change curve of the pressure with time can show the circumstance of internal ballistic inside.
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