南水北调中线工程冬季闸门小开度运行, 闸后淹没水跃紊动剧烈, 为验证小开度下闸门运行的安全性, 选取蒲 阳河典型节制闸开展闸门振动原型观测。通过测量不同开度下的闸门振动特性, 分别采用动应力、振动位移( 振幅) 和频率作为标准进行振动安全评价, 结果表明: 闸门最大动应力为 11 33 MPa, 远小于材料允许应力的 20% ( 约 32 M Pa) ; 最大振动位移 151 97 Lm, 小于闸门振动危害程度可忽略不计的上限位移501 8 Lm; 所有测试工况的安全临界 振幅 A 与频率 f 满足 lgA< ( 31 14- 11 16 lg f )。上述三种评价准则的判定结果一致, 因此, 中线闸门小开度淹没出 流条件下, 闸后水跃紊动引起的闸门振动危害可忽略, 闸门结构安全稳定。

In winter, the co ntr olling gates of the M iddle Ro ute of South2to2 No rth Water Diversion Pr oject ar e o per ated under small opening conditio n. The submer ged hydr aulic jum p is accompanied by sever e turbulence behind the sluice g ates. To evaluat e the safety of g ate o perat ion under small opening conditio n, we conducted field t ests on the Puyang Riv er Gates and measur ed the par ameters of g ate vibr ation under the conditio ns of differ ent gat e opening s. The test results indicated that t he maximum dy2 namic str ess of the gates is 11 33 MPa, sma ller than 20% of the allow able st ress, i. e. about 32 MPa. The max imum v ibration dis2 placement 151 97 Lm is less than the upper limit displacement 501 8 Lm, below which the hazard of g ate v ibr atio n can be neg li2 g ible. The relation between amplitude A and frequency f follow s lgA< ( 31 14- 11 16 lg f ) . T he evaluat ion results o f the above 3 kinds of criteria ar e consistent; therefor e, the hazard o f g ate v ibration induced by submerg ed hydraulic jump is neg ligible, and the gate structure is safe and stable w hen the sluice gates are o per ated in small opening conditio n.

国家重点研发计划课题( 2017YFC0405103) ;国家自然科学基金( 51679262)