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对固结系数的非线性变化进行了理论分析,推导了固结系数的非线性控制方程,指出了y因子对固结系数非线性变化的影响。考虑到固结系数、渗透系数、压缩系数整体变化以及双层软土一维非线性固结方程求解困难,建立了差分格式的双层软土一维非线性固结差分方程,利用差分法对该方程进行了求解,为工程中复杂方程的计算提供了一种新的方法。研究表明:固结系数并不是决定双层软土非线性固结性状的唯一指标,须综合考虑各种因素的影响。
The nonlinear variation of consolidation coefficient is analyzed theoretically. The nonlinear governing equation of consolidation coefficient is deduced. The influence of y factor on the nonlinear variation of consolidation coefficient is pointed out. Taking into account the consolidation coefficient, permeability coefficient, the overall variation of compression coefficient and the difficulty in solving one-dimensional nonlinear consolidation equations of double-layered soft soil, a one-dimensional nonlinear consolidation difference equation of two-layered soft soil with difference scheme is established. The equation is solved, which provides a new method for the calculation of complex equations in engineering. The results show that the coefficient of consolidation is not the only index that determines the nonlinear consolidation characteristics of double-layer soft soil. The influence of various factors must be considered comprehensively.