CAJ | 학술논문

依托某水电站明渠截流，通过水力学模型试验，分析了二期围堰泄流槽开挖断面对明渠截流难度的影响。试验成果表明：将泄流槽底高程由3250．0 m 降低至3248．0 m 时，在截流困难段，即龙口宽度为30．0 m ，截流落差降低了23．8％，单宽功率减少了51．9％；将泄流槽宽度由37．0 m 变为50．0 m 时，在截流困难段，即龙口宽度为30．0 m 时，截流落差降低了27．8％，单宽功率减少了48．6％。在实际开挖过程中，为增大泄流槽的分流能力，降低明渠截流难度，应优先降低泄流槽底高程，如果遇到水下开挖施工困难，可以增大泄流槽宽度。
의탁모수전참명거절류，통과수역학모형시험，분석료이기위언설류조개알단면대명거절류난도적영향。시험성과표명：장설류조저고정유3250．0 m 강저지3248．0 m 시，재절류곤난단，즉룡구관도위30．0 m ，절류락차강저료23．8％，단관공솔감소료51．9％；장설류조관도유37．0 m 변위50．0 m 시，재절류곤난단，즉룡구관도위30．0 m 시，절류락차강저료27．8％，단관공솔감소료48．6％。재실제개알과정중，위증대설류조적분류능력，강저명거절류난도，응우선강저설류조저고정，여과우도수하개알시공곤난，가이증대설류조관도。
Based on hydraulic model test of a hydropower station open diversion channel closure ,this paper analyzes the influences on closure difficulty by different diversion trench excavation sections .The result shows that when the bottom elevation of the diversion trench decreases from 3 250 .0 m to 3 248 .0 m ,whlie the open diversion channel closure is difficult and the gap width is 30 .0 m ,the water drop decreases by 23 .8% ,power per unit width decreases by 51 .9% .If the bottom width of the diversion trench increases from 37 .0 m to 50 .0 m ,while the gap width is 30 .0 m ,the water drop decreases by 27 .8% ,power per unit width decreases by 48 . 6% .During practical excavation ,to increase the discharge of the diversion trench and decrease the difficulty of the open diversion channel closure ,we prefer to reduce the bottom elevation of diversion trenches .What's more ,if underwater excavation is hard to conduct ,increasing the bottom width of the diversion trench is also available .