浑水管道输水灌溉系统防淤堵技术研究

Research on anti-clogging technology of muddy water pipeline conveyance and irrigation system

【目的】对浑水管道输水灌溉系统的水沙运动规律进行研究,并探讨其防淤堵技术措施,为管道输水灌溉技术在渠灌区的推广应用提供技术支撑。【方法】以泥沙运动力学和管道水力学为理论基础,通过管道输水试验系统,采用室内试验观测分析浑水管道的临界不淤流速,并结合已建管灌工程实践,探讨浑水渠灌区管道淤堵的成因及其防淤堵技术。【结果】测得了不同含沙量下的临界不淤流速,并依此建立了浑水管道临界不淤流速的经验计算公式。浑水管道较管道输送的临界不淤积流速小。渠灌区管道输水系统的淤堵成因包括水源、规划设计和运行管理等3方面的因素。浑水管道输水灌溉系统的防淤堵技术应从工程规划设计和运行管理2方面着手解决。【结论】提出了浑水管道输水灌溉系统的防淤堵技术措施;建立了浑水管道临界不淤流速的经验计算公式,该公式计算结果可靠,可作为含沙量小于100g/kg渠灌区管道输水灌溉工程设计的依据。

[Objective] Movement mechanisms of water and sediment in muddy water pipeline conveyance and irrigation system were investigated in this study.The anti-clogging technology was studied as well,which can provide some technical support for the application and extension of pipeline conveyance and irrigation technology in irrigation districts.[Method] Based on sediment transportation mechanics and pipeline hydraulics,the critical non-silting velocity in muddy water pipeline was observed and analyzed by using indoor water pipeline conveyance experimental system.Together with the practice of built-up water pipeline conveyance system,the pipeline clogging mechanism and anti-clogging technology in muddy water irrigation district were discussed.[Result] Critical non-silting velocities with different sediment concentrations were obtained and thereby an empirical formula was founded to calculate critical non-silting velocities.The critical non-silting velocity in muddy water pipeline was smaller than the critical deposition velocity.The cause of pipeline deposition included water source,designing,operation and management in irrigation districts.[Conclusion] The anti-clogging technology measure of muddy water pipeline conveyance and irrigation system have been put forward.The empirical formula of critical non-silting velocity were investigated,and the calculated results of this empirical formula are relatively reliable,which can be regarded as the design basis of pipeline irrigation project for silt concentration less than 100 g/kg.