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针对现有竖向排水井地基固结解析理论对影响区一律采用圆形等效假定的缺陷,研究了影响区真实形状为正六边形的按梅花形布置的竖向排水井地基的固结问题。通过建立新固结方程和引入新的边界条件,并考虑土体水平渗透系数变化,得到了相应的解析解。对于土体水平渗透系数的3种变化模式,分别给出了各种模式下的特殊解。在此基础上,分析了3种模式下3个主要的无量纲参数对地基固结性状的影响,并比较了计算结果和现有理论结果。分析结果表明,影响区和涂抹扰动区范围越大,固结越慢;土体的最大与最小水平渗透系数之比越小,固结越快;在相同条件下,考虑扰动区渗透系数线性变化的模式2固结最快,而假定扰动区渗透系数不变的模式1的解与现有理论解相当接近,验证了现有竖向排水井地基固结解析理论中对影响区采用圆形等效假定的合理性。
According to the theory of ground consolidation of existing vertical drains, the circular equivalent assumption is always applied to the affected area. The consolidation of vertical drainage well foundation with plum-shaped layout whose shape is regular hexagon is studied. . By establishing a new consolidation equation and introducing new boundary conditions, and taking into account the variation of soil horizontal permeability coefficient, corresponding analytical solutions are obtained. For the three kinds of variation modes of soil horizontal permeability coefficient, the special solutions under different modes are given respectively. Based on this, the influences of three major dimensionless parameters on the consolidation behavior of foundation under three modes are analyzed, and the calculation results and the existing theoretical results are compared. The results show that the larger the range of influence zone and smearing disturbance zone, the slower the consolidation; the smaller the ratio of maximum and minimum horizontal permeability coefficient, the faster the consolidation. Under the same conditions, considering the linear change of permeability coefficient Mode 2 is the fastest, while the solution of mode 1, which is assumed to be constant in the disturbance zone, is quite close to the existing theoretical solutions. It is verified that the existing vertical drainage well foundation consolidation analysis theory uses circular Effectiveness of the hypothesis.