Gradient-density PUF was produced in two ways : mould shaping and embed shaping, through changing volume filling coefficient, mass filling coefficient, and the size of foam core.

采用模塑成型和嵌入成型两种方法，通过改变体积填充系数、质量填充系数和芯体尺寸，制备了梯度密度聚氨酯泡沫塑料。

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The filling coefficient theory was put forward, a criterion for the filling coefficient of soil stratum failure and a critical hydraulic gradient chart were formulated.

提出了填充系数理论，制订了土体渗透破坏形式的填充系数判别式和管涌临界破坏坡降计算图。

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