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本文对砂基在表面作用或不作用上覆压力、具有四种竖向排水的条件下，推出了地震期间砂基内超静孔隙水压力的计算公式，并给出了一个算例．
In this paper, under the condition that the sand base acts on the surface or does not act on the overburden pressure and has four types of vertical drainage, the calculation formula of the excess pore water pressure in the sand base during the earthquake is deduced, and an example is given.