岩土工程学报Issue(5)：922-932,11.DOI:10.11779/CJGE201405017
土石坝漫顶溃坝过程离心模型试验与数值模拟
Centrifugal model tests and numerical simulations for break of earth-rock dams due to overtopping
摘要
Abstract
By means of the centrifugal model test system for break of dams, experimental studies on the break of a homogenous earth-rock dam with three different heights (the largest one is up to 32.0 m) and a clay core dam of 16.0 m in height due to overtopping failure are performed. The break mechanism and the development rules of breaches are clearly released. It is found that for the homogeneous earth-rock dams, with the increase of dam height, the longitudinal down cutting of the breaches together with the collapse rate of breaking slopes obviously increases, and the hydrographs of break discharge become steeper. The peak discharge increases and emerges earlier, and the duration of dam break becomes shorter. For the clay core dams, the break mechanism and the breach development rules are obviously different from those of the homogenous dams. With the increasing erosion of downstream dam shells by overtopping flows, shear failure of the clay core occurs and the discharge through the breach abruptly increases. Based on the above test results, numerical models for depicting the break development of homogenous earth-rock dams and clay core dams and for calculating the hydrographs of their break discharges are proposed. The methods for the relevant numerical models are also put forward. The rationality of the proposed numerical model is validated through comparison between the numerical simulations and the observed results.关键词
土石坝/漫顶破坏/离心模型试验/溃坝过程数学模拟Key words
earth-rock dam/overtopping failure/centrifugal model test/numerical simulation of overtopping process分类
建筑与水利引用本文复制引用
陈生水,方绪顺,钟启明,李运辉..土石坝漫顶溃坝过程离心模型试验与数值模拟[J].岩土工程学报,2014,(5):922-932,11.基金项目
National Natural Science Foundation of China （）
