河堤溢流破坏机理的模型试验研究

IF 0.4 Q4 ENGINEERING, GEOLOGICAL
Jin-Man Kim, Min-Cheol Park, In-Jong Moon, Yoon-hwa Jin
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引用次数: 3

摘要

本文通过中试规模堤防(模型高度0.4 ~ 0.8 m)和实际规模堤防(模型高度1.0 m)两种模型试验对堤防溢流破坏参数进行了检验,将堤防溢流破坏过程延续到以下三个步骤:第一步,发生对堤防边坡的局部冲刷,溢流速度缓慢增加;第二阶段,冲刷面扩大,溢流速度加快。最后,由于堤面破坏面较宽,导致堤段完全溃决,溢流速度降低。堤防破坏角()大于朗肯土压力下的边坡破坏角。堤防高度增大,堤防溢流速度()增大,对堤防施加额外的牵引力,破坏角()和破坏面()增大。由于中试砂样与实试砂样直径相同,故两种砂样的临界冲刷速度相同,冲刷性能受溢流速度变化的支配。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Model Tests for Examination of Overflow Failure Mechanism on River Levee
This research conducted the two types of model tests to examine the failure parameters by levee overflow, those were the pilot-scale levee (model height 0.4∼0.8 m) and real scale levee (model height 1.0 m). The procedure of levee failure by overflow was succeeded to the following three steps: At first step, the local scouring on levee slope was happened and the overflow velocity was increased slowly. At second step, the enlarged scouring surface and the rapid overflow velocity were succeeded. At last, the levee section was broken totally and the overflow velocity was decreased because of the wide failure surface of levee. The levee failure angle () was appeared bigger than slope failure angle of Rankine earth pressure. The enlarged levee height () made the faster overflow velocity () of the levees, therefore additional tractive force was applied to it, futhermore the failure angle () and failure surface () were enlarged. Because the sand sample for pilot-scale and real scale tests had the same diameter, the critical scouring velocity of each type was also the same, and the scouring properties were governed by variation of overflow velocity.
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