船闸闸室灌泄水过程非稳定渗流特性

为了研究船闸闸室在非均质成层地基、灌泄水条件下的非稳定渗流特性,根据渗流基本理论,将渗流分为固结渗流与瞬时稳定渗流。以工程实例为依托,利用有限元软件ABAQUS建立二维渗流模型,模拟船闸灌泄水过程,考虑流固耦合,分析非稳定渗流特性及影响。结果表明,随着灌泄水的周期性变化,测压管水位存在周期性、衰减性与滞后性;在灌泄水过程中,存在泄水、灌水速度零点;泄水末期,非稳定渗流计算的渗透应力沿高程均大于低水稳定渗流计算值,渗透稳定系数降低,发生渗透破坏的可能性加大。因此,在船闸防渗设计中应充分考虑非稳定渗流场的影响。

Characteristic analysis of unsteady seepage in the filling and emptying process of lock chamber

In order to study the characteristics of unsteady seepage in the filling and emptying process of lock chamber with a non-homogeneous layered ground, according to the theory of basis seepage flow, this study divides the seepage into the consolidation seepage and the instantaneous steady seepage. Based on the finite element software ABAQUS, the two-dimensional seepage model has been built according to a project example, in order to simulate the filling/emptying process of lock chamber considering fluid-solid coupling and analyze the characteristics and effect of unsteady seepage. The result shows that, with the cyclical variations of filling and emptying, the piezometric level has three characteristics: cyclicity, decay and hysteresis. In the filling and emptying process, zero velocity points exist. In addition, in the end of emptying process, the infiltration stress of unsteady seepage is greater than that of steady seepage with a low water level, the stability coefficient decreases and the possibility of seepage failure grows. Therefore, the influence of unsteady seepage field should be taken into account in the anti-seepage design of ship lock.