多沙河流高压输电塔基冲刷试验研究

发布时间：2018-03-10 01:14

本文选题：水槽试验　切入点：水流流态　出处：《人民黄河》2017年07期 　论文类型：期刊论文

【摘要】：为研究复杂结构桩基在多沙河流上的局部冲刷问题,利用1∶100正态模型水槽对主河槽中输电塔基的冲刷情况进行了试验,对塔基不同埋深、不同洪水频率条件下的冲刷坑形态进行了观测和分析。结果表明:塔基周围水流流态及流速分布与单桥墩类似,但桩群内部水流流态及流速分布则相对复杂;试验前后塔基前水深、流速的比值分别为0.47~0.64、1.25~1.26;塔基冲刷深度与水流单宽流量成正比,与承台埋深成反比,下游塔基的冲刷深度略小于上游塔基的。
[Abstract]:In order to study the problem of local scour of pile foundation with complex structure on sandy rivers, a 1: 100 normal model flume was used to test the erosion of transmission tower foundation in the main channel, and different buried depths of the tower foundation were carried out. The morphology of scour pits under different flood frequencies is observed and analyzed. The results show that the distribution of water flow and velocity around the tower is similar to that of single bridge pier, but the distribution of water flow and velocity in pile group is relatively complex. Before and after the test, the ratio of water depth and velocity of water in front of tower foundation is 0.47 ~ 0.64 ~ 1.25 ~ 1.26 respectively, the erosion depth of tower base is directly proportional to the single width flow of water flow and inversely proportional to the depth of cap burying, and the scour depth of downstream tower base is slightly smaller than that of upstream tower base.
【作者单位】：黄河水利科学研究院;无锡市城市防洪工程管理处;
【基金】：中央级公益性科研院所基本科研业务费专项(HKY-JBYW-2016-30) 国家重点研发计划项目(2016YFC0402403)
【分类号】：TM75;TU476;TV149

【相似文献】