山区人行网箱桥水毁机理分析

山区河流常年水位较低,雨季河水暴涨。由于洪水历时短、来水量大,洪峰过程期河水冲刷能力强,山区人行小桥涵水毁破坏严重。该文利用数学模型对重庆市万州区插旗村格宾网箱便桥进行流场模拟,通过流场及桥墩受力分析得出网箱桥水毁主要原因为墩头压缩冲刷、网箱桥墩整体刚度差造成的桥墩侧偏、下沉等,并据此提出了优化设计建议。

The Mechanism Baced on the Numerical Simulation of Water Damage for Rural Footbridge

The perennial water level of the mountainous river is very low. In summer, the floods last for a short time but bring an amount of water in the watercourse. Meanwhile the scour capability of the floods is very strong. So the main reason for damage of the rural bridge is the water damage. Based on the two-dimensional mathematical model of the Chaqi gabion footbridge, the mechanism of water damage for gabion footbridge is analyzed. The main reasons for the damage are side slip and settlement of the piers because of the compression scour and the stiffness differences of the gabion. Some optimum advice are put up.