论文部分内容阅读
目前针对塑料排水板处理地基的固结计算均采用传统的砂井固结理论,即需要将扁长的塑料排水板等效为圆柱体之后再进行分析,这种简化过程可能会带来一定误差。为此,将塑料排水板视为与其形状较为接近的椭圆柱体进行研究。首先给出椭圆柱坐标体系下的塑料排水板处理地基固结基本方程,并基于椭圆柱坐标系理论得到超静孔隙水压和固结度的解析解,讨论新的解答与已有经典解答之间的关系,认为经典的排水板周长等效法高估了排水板的排水固结效果。此外,讨论了排水板渗透系数k_w随深度线性衰减和随时间指数衰减变化时的固结解析解,通过计算讨论认为,渗透系数随时间的变化对排水板地基固结影响最显著,参数A_2值越大,排水板地基固结速率越慢,以致于排水板严重淤堵而丧失排水能力。
At present, the consolidation theory of the plastic drainage board to treat the foundation adopts the traditional sand consolidation theory, that is, the flat plastic drainage board needs to be analyzed as a cylinder after the equivalent, and the simplification process may bring some errors . For this reason, the plastic drainage board is considered as an elliptic cylinder with a shape closer to it. First, the basic equation of plastic drainage plate under the elliptic cylindrical coordinate system is given, and the analytic solution of the excess pore water pressure and the degree of consolidation is obtained based on the elliptic cylindrical coordinate system theory. The new solution and the existing classical solution Between the relationship that the classic drainage perimeter method to overestimate the drainage board drainage consolidation effect. In addition, the consolidation analytical solution of the drainage board permeability coefficient k_w along with the linear attenuation of depth and the exponential decay with time is discussed. According to the calculation and discussion, it is found that the change of permeability coefficient with time has the most significant effect on the consolidation of drainage board foundation. The larger, the slower rate of consolidation of the drainage board foundation, resulting in a serious drainage plugging clogging and loss of drainage capacity.