水利学报2025，Vol.56Issue(8)：1025-1036,12.DOI:10.13243/j.cnki.slxb.20240789
基于随机过程的多沙河流河道内塔基局部冲刷研究
Research on local scour depth of tower foundation in sediment-laden rivers based on stochastic process
摘要
Abstract
The problem considered in this study is the local scour depth of transmission tower foundations,for which there is not yet unified calculation method in the sediment-laden rivers.Due to these problems,they are usually cal-culated by the formula of bridge pier scour at present,which lead to significant deviations with the actual results,especially in sediment-laden river like the Yellow River.In order to reduce the potential natural hazards caused by inaccurate calculations,this study has established a theoretical formula for the local scour depth of tower foundation based on the fundamentals of stochastic process.As the forces acting on the sediment particle are uncertain during the process of scouring around the tower foundation,the motion of each particle in the scour pit is also random,thus forming a stochastic sediment motion field within the scour influence range.According to the sediment transport theory,there are specific transport laws for both bed-load and suspended-load on the riverbed near the tower founda-tion.These laws provide the theoretical basis for determining the probability density of positional state transition based on Markov random field and the statistical theory of sediment movement.The scour pattern of the tower founda-tion,positional state model,and transfer-probability are discussed,and then the analytical formula for local scour depth is obtained by deriving the average dynamical equations of positional state.Meanwhile,by analyzing the physi-cal mechanism of transition probability density,this study has determined the expression structures for the probabil-ity density functions of time-averaged positional state transition.In light of the measured statistical data from natural sediment-laden rivers and physical modeling experiments,the relevant parameters in the calculation formula for local scour depth of tower foundation have been preliminarily determined.Finally,two sets of tower foundation scour model tests can be used as evidence to verify the proposed analytical formula for local scour depth,and the result indicates that the calculated values are consistent with the actual measurements.关键词
随机过程/多沙河流/河内塔基/局部冲刷/模型试验Key words
stochastic process/sediment-laden river/tower foundation/local scour depth/physical modeling experiment分类
建筑与水利引用本文复制引用
曹帅,刘磊,张红武,张倩..基于随机过程的多沙河流河道内塔基局部冲刷研究[J].水利学报,2025,56(8):1025-1036,12.基金项目
国家重点研发计划项目(2016YFC0402500) （2016YFC0402500）
国家自然科学基金青年科学基金项目(52009145) （52009145）
鄂尔多斯水利科技重点项目(20232000090) （20232000090）
