The research results of the effect of covered soil density on reducing radon emanation rate are introduced.

介绍了覆土密度对降低氡析出率影响的试验研究结果。

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Model tests of large driven pile jacked into sands were conducted to obtain the soil density changes due to the compaction.

通过砂土中的大型沉桩模型试验，得出了桩周土体相对密度的变化规律。

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The soil density is decreased, and the disperse coefficient and porosity are increased in the sites where were burnt in successive years.

连年火烧使土壤密度比未烧林地下降，而孔隙度和分散系数升高。

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Its deadliness was linked, among other things, to the weakness of buildings, the depth of the quake, the density of population, the fault and soil types, and the intensity of the shaking.

ECONOMIST: Why the Kashmir earthquake happened and what might be done