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本文在理论上探讨了射流在侵彻或钻孔过程中,孔径和射流在孔底的堆积厚度之间的关系。用不可压缩流体理论证明在平面问题中孔宽具有极限值,当孔宽变小而趋于该值时,堆厚趋于无穷。 相似文献
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In order to investigate the influence of the vertical vibration loading on the liquefaction of saturated sand, one dimensional
model for the saturated sand with a vertical vibration is presented based on the two phase continuous media theory. The development
of the liquefaction and the liquefaction region are analyzed. It is shown that the vertical vibration loading could induce
liquefaction. The rate of the liquefaction increases with the increase of the initial limit strain or initial porosity or
amplitude and frequency of loading, and increases with the decrease of the permeability or initial modulus. It is shown also
that there is a phase lag in the sand column. When the sand permeability distribution is non-uniform, the pore pressure and
the strain will rise sharply where the permeability is the smallest, and fracture might be induced. With the development of
liquefaction, the strength of the soil foundation becomes smaller and smaller. In the limiting case, landslides or debris
flows could occur.
The project supported by the National Natural Science Foundation of China (40025103, 10202024) 相似文献
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