考虑船闸闸室宽度影响的横向渗流阻力系数法

为在船闸闸室的二维横向渗流计算中考虑闸室宽度的影响,基于改进阻力系数法,建立了考虑出流宽度的阻力系数局部计算模型。改变地基深度与防渗深度、出流宽度的比值,运用ABAQUS软件计算渗透量,确定流量系数、阻力系数及分配系数,绘制各系数图表。结果表明,闸室宽度越窄、防渗深度越深,对横向出流宽度的影响愈显著。对于等级较低、闸室宽度较小、水头较大的船闸,应充分考虑闸室宽度的影响,防止低估出口段坡降值而不利于渗流稳定性。

Resistance coefficient method for the transversal seepage considering the width of lock chamber

For the two-dimensional simulation of transversal seepage of the lock chamber, in order to take the effect of the width of lock chamber into account, the resistance coefficient model of inner section has been built based on the improved resistance coefficient method. By the local model of the ABAQUS software, this study changed the ratio of the foundation depth to the impervious depth and the ratio of the foundation depth to the outflow width, to calculate the discharge coefficient, the resistance coefficient and partition coefficient, based on the infiltration capacity, and then charts of different coefficients have been drawn. The result shows that the narrower the chamber width is, the larger the impervious depth will be, and the effect on the lateral outflow width will be more pronounced. For the lock of a lower level, narrower chamber width and larger water head, the impact of the chamber width should be taken full account to prevent the under estimation of the exit section slope, which is not conducive to the seepage stability. In this paper, the accuracy of the conventional resistance coefficient method has been improved, and the principle can be applied to similar projects, e. g. the effect of outlet width on the infiltration of a foundation pit.