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地基排水控制法是一种通过加速施工期间地基超孔压消散并限制工程运营期间地基的超孔压消散,一方面促进沉降在施工期间尽可能多地发生,另一方面使工程使用年限内的工后沉降发生的速度尽可能降低,从而达到最大限度地控制地基工后沉降目的的新型地基处理方法。采用基于六面体孔压单元及塑料排水板线性单元等三维有限元技术,分析了排水控制法处理后地基的工后沉降与竖向防渗帷幕及塑料排水板深度的关系、工后沉降和超孔压随时间和空间的分布规律,得出了排水控制法具有以相对低廉的工程造价,在较短的工期内获得工后沉降为0的特殊处理效果,可以设置较浅的竖向防渗帷幕深度和较深的塑料排水板深度来寻求较高的性价比,工程运营期间密封区域以内超孔压上升导致的有效应力减小是排水控制法减小地基工后沉降的重要原因等结论。
Foundation drainage control method is a way to accelerate the dissipation of excess pore pressure during construction and to limit the excess pore water pressure during the construction operation. On the one hand, to promote as much as possible the subsidence during construction, and on the other hand, Post-construction settlement as much as possible to reduce the speed, so as to achieve the maximum control of the purpose of post-construction subsidence of the new foundation treatment. Using 3D finite element method based on hexahedral pore pressure unit and linear element of plastic drainage board, the relationship between post-construction settlement and vertical seepage curtain and plastic drainage board depth after drainage control method is analyzed. After settlement and perforation Pressure with the distribution of time and space, and concluded that the drainage control method has a relatively low project cost, in a relatively short period of time to obtain post-construction settlement of 0 special treatment effect, you can set shallow vertical seepage curtain Depth and depth of the plastic drainage board to find a higher cost performance, engineering operation within the sealing area increased pore pressure caused by the effective stress reduction is the drainage control method to reduce the foundation of the important causes of post-construction settlement and so on.