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排水边界是影响土体固结快慢的重要因素之一。针对目前透水和不透水这两种理想化的边界条件对实际工程的局限性,提出了严格满足初始条件的变孔压排水边界条件,建立了变孔压排水边界下一维非线性固结理论。采用分离变量法求出该边界条件下的土体超孔隙水压力、土体有效应力,并进一步推导得到按沉降定义的平均固结度U_s和平均孔隙水压力定义的平均固结度U_p以及边界处排水速度v,通过改变边界条件中的参数α,结合具体算例与已有的修正非线性固结理论解的结果进行对比分析。结果表明:提出的变孔压边界条件能更好地反映实际工程工况。
Drainage boundary is one of the important factors affecting soil consolidation rate. Aiming at the limitations of the two idealized boundary conditions such as pervious and impervious to the actual project, the variable pore pressure drainage boundary conditions which satisfy the initial conditions are established. The one-dimensional nonlinear consolidation theory . Using the method of separate variables, the excess pore water pressure and the soil effective stress under the boundary conditions were calculated, and the average degree of consolidation U_s defined by settlement and the average degree of consolidation U_p defined by the average pore water pressure and the boundary Drainage speed v, by changing the boundary conditions in the parameter α, combined with specific examples and the existing modified nonlinear consolidation theory results were compared. The results show that the proposed variable pore pressure boundary conditions can better reflect the actual engineering conditions.