虹吸式管道排沙技术在西霞院水库清淤中的试验研究

为研究虹吸式管道排沙技术在西霞院水库清淤中的应用及效果,基于水库库区现场的清淤试验,利用西霞院水库上下游水位差的虹吸作用,辅以破土射流冲吸式吸泥头扰沙,通过对输沙管道沿程含沙量和流量等特征值的跟踪监测,研究单泵及双泵串联条件下,200m3/s、220m3/s、230m3/s、240m3/s、250m3/s、300m3/s和330m3/s共7个流量级不同试验工况下测点含沙量的变化范围、趋势及粒径级配等,并对试验清淤效果进行定量分析。水库清淤的现场试验结果表明:随着虹吸式管道排沙试验的工况流量不断增大,所测的平均含沙量呈现出增大趋势,而最大含沙量呈现先增大后减小的趋势,整个试验过程最大含沙量达到342.61kg/m3,清淤2 000m3泥沙的生产成本为10.56万元。

Application of siphon pipe sediment2discharging technology in dredging of Xixiayuan Reservoir

In o rder to study the applicat ion and effect o f sipho n2ty pe pipe sediment2discharg ing techno lo g y in dr edging of Xix i2 a yuan reser vo ir in the m iddle r eaches o f t he Yellow River, based o n the o n2site dredg ing test at the r eserv oir, w e utilized t he siphon effect o f the w ater level differ ence betw een the upper and low er reaches o f Xixiayuan Reserv o ir, alo ng w ith so il breaking jetting suctio n dr ag head fo r sediment reg ulat ion. T hr oug h tr acking and m onitoring the characteristic v alues such a s sediment concentra tion and flow r ate alo ng the sediment tr anspo rt pipeline, w e st udied t he sediment co ncentr atio n v ariatio n rang e, tr end, and particle size g r ada tio n at the measured po int under differ ent t est co nditio ns, and ca rried out qua nt itativ e a2 nalysis of the dr edg ing effect in the test . T he r esults show ed that w ith the incr ease o f the flow rate, the aver ag e sedim ent co ncentrat ion w o uld incr ease w hile the max im um sediment co ncent ration w o uld incr ease first and t hen decr ease. The m ax i2 m um sediment co ncent ration thr oug hout the test r eached 3 421 61 kg / m3 . T he pro duct ion co st fo r dr edg ing 2 0 00 m3 sedi2 m ent w as 105 600 yuan.