护岸工程顺水沉排受力现场测试分析

In-situ test and research on forced condition of downstream sinking mattress

在河道护岸工程中,沉排顺水铺设可有效减少河床的溯源冲刷,但沉排排体受力情况十分复杂,对施工方案的制定有较大影响。依托长江下游黑沙洲水道航道整治工程,针对工程区域深水、大流速的情况,通过施工现场测试,首次监测了不同工况下沉排施工过程中排体和铺排船缆绳的受力情况,揭示了顺水沉排施工中排体和铺排船缆绳受力的一般特性。分析结果表明,排布最大受力出现在排体将要脱离船舷时;排头梁、排体两侧受力要大于排体中部;排头沉放时,铺排船缆绳最大受力要略大于排体着床达到一定长度后的受力。

In levee revetment engineering, downstream sinking mattress can effectively reduce headcut scour, but the forced condition of mattress is very complicated and has relatively severe influence on construction scheme making. In Heishazhou navigation channel regulation works in the downstream of Yangtze River, which is characterized by deep water and large flow velocity, the forced conditions of mattress - laying vessel and the vessel~ mooring cable were monitored through in - situ test under different construction conditions and their general forced characteristics were revealed. The analysis results show that the maximum force of the mattress appears when the mattress is about to sink, the forces of the leading beam and the two side parts of the mattress are larger than that of the middle part; when the leading beam sinks, the force of mooring cable of the vessel is slightly larger than that after the mattress is laid to a certain extent.