| 摘要 |
A method is provided for installing a tubular member in a porous solid medium beneath the surface of a liquid body. The method is initiated by placing the member in a substantially upright position within the liquid body with an open end of the member positioned upon the solid medium and the opposite end of the member extending above the surface of the liquid body. A downward driving force is applied to the member in the direction of the solid medium, advancing the member into the solid medium. As the member is driven downward into the solid medium, a plug of the solid medium forms in the open interior of the member. The length of the plug corresponds to the depth that the member penetrates the solid medium. At the same time, liquids freely migrate into the open interior of the member from the liquid body or the solid medium respectively, via the open end of the member. A sufficient volume of migratory liquids, however, is withdrawn from the interior of the member to lower the level of migratory liquids in the interior substantially below the surface of the liquid body. As the level of migratory liquids in the interior drops below the surface of the liquid body, additional migratory liquids pass upwardly into the interior from the solid medium. The upward flow of migratory liquids within the plug causes a reduction in the effective stress in the plug, correspondingly causing a reduction in resistance from the plug to driving the member into the solid medium and facilitating installation of the member in the solid medium.
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