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一般说来,在Biot固结理论中,任何时刻t的骤加荷载(例如逐级加载的每级荷载)都可能引起土体的位移、应力和孔隙压力的突变,因而形成这些场对时间坐标来说是间断的情况。我们称这些场在时刻t的右极限与左极限之差为t时刻骤加荷载产生的初始附加场。本文论述初始附加场的偏微分方程组的形式和需满足的边界条件以及它的若干解析解。最后指出,骤加荷载产生的初始附加场是Biot固结理论的一个必要的组成部分。
Generally speaking, in Biot’s consolidation theory, sudden load at any time t (eg each load of progressive loading) may cause abrupt changes in soil displacement, stress, and pore pressure, thus forming these field-to-time coordinates. It is an intermittent situation. We call the difference between the right limit and the left limit of these fields at time t as the initial additional field generated by sudden loading at time t. This paper discusses the form of partial differential equations of the initial additional field, the boundary conditions to be satisfied, and some of its analytical solutions. Finally, it is pointed out that the initial additional field generated by the sudden loading is an essential part of the Biot consolidation theory.