Journal of Hohai University (Natural Sciences)
1000-1980
2022
50
5
98
104
10.3876/j.issn.1000-1980.2022.05.013
article
胶结土坝漫顶溃坝模型试验研究
Experimental study on overtopping and dam break model of cemented soil dam
通过开展大尺度胶结土坝溃坝模型试验,对胶结土坝在洪水漫顶作用下的流速分布、坝体侵蚀的变化过程进行了分析,以验证胶结土坝漫顶不溃的可能性。试验结果表明:模型填筑胶结土28.d无侧限抗压强度达到4.MPa以上；胶结土坝在最大坝顶水头为55.cm、下游坡比1∶2、最大流速达5.6.m/s条件下,漫顶冲刷44.h未发生溃决破坏；漫顶冲刷后下游坝坡最大侵蚀深度为10.cm,平均侵蚀深度仅为1.07.cm；胶结土坝可有效防止洪水漫顶冲刷引发的溃决破坏。
Through the large-scale model test of cemented earth dam, the velocity distribution and the dam erosion process of cemented earth dam under the flood overtopping were analyzed to verify the feasibility of non-failure overtopping of cemented earth dam. The test results show that the unconfined compressive strength of cemented soil within the model is more than 4.MPa after 28 days. When the maximum water head at the crest of cemented earth dam is 55.cm, the downstream slope ratio is 1∶2 and the maximum velocity reaches 5.6.m/s, there is no collapse failure after the overtopping scouring for 44.h. After the overtopping scouring, the maximum erosion depth of downstream dam slope is 10.cm and the average erosion depth is only 1.07.cm, thus the cemented earth dam can effectively prevent the collapse caused by the overtopping scouring of flood.
胶结土坝;无侧限抗压强度;漫顶溃坝;土体侵蚀深度;冲蚀量
cemented soil dam; unconfined compressive strength; overtopping and dam break; soil erosion depth; erosion amount
李兆宇,贾金生,苏安双,郑璀莹,李爱丽
LI Zhaoyu, JIA Jinsheng, SU Anshuang, ZHENG Cuiying, LI Aili
(1.黑龙江省水利科学研究院寒区工程研究所,黑龙江 哈尔滨150080;2.中国大坝工程学会,北京100048)
(1.Cold Region Engineering Research Institute, Heilongjiang Provincial Hydraulic Institute, Harbin 150080, China;2.Chinese National Committee on Large Dams, Beijing 100084, China )
hhdxxbzr/article/abstract/20220513