摘要
堰塞坝坝体材料分布具有随机性和不均匀性,材料参数存在较强的离散性和变异性,且坝体结构松散、容易失稳,失稳破坏将会带来级联效应灾害链。因此,基于堰塞坝组成材料分布随机性条件下,研究堰塞坝的渗流特征对实际工程具有重要的意义。以红石岩堰塞坝为例,对坝体进行细化分区,对不同分区赋予不同的渗透系数,分别进行稳定、非稳定状态以及设置混凝土防渗墙的渗流计算,探究坝体材料分布的随机性对坝体渗流特性的影响。分析表明,无论是稳定、非稳定状态还是设置混凝土防渗墙后的渗流,不同分区情况下堰塞坝的水压、渗流量以及浸润线等的分布情况均有不同,组成材料的随机性对坝体渗流特性的影响十分明显;当堰塞坝从坝顶到坝底、从上游侧到下游侧渗透系数均逐渐增大时,对坝体的渗流最为不利。实际工程中应关注堰塞坝材料不均匀性对坝体安全影响并及时采取混凝土防渗墙等合理防渗措施。
Because the material distribution of landslide dams has randomness and inhomogeneity,and the material parameters have strong discreteness and variability,the dam structure is loose and prone to instability.The failure of instability will bring a cascade effect disaster chain.Therefore,it is of great significance to study the seepage characteristics of landslide dams for practical engineering based on the distribution randomness of landslide dam constituent materials.Taking Hongshiyan landslide dam as an example,the dam body is refined and partitioned,and different permeability coefficients are assigned to different partitions to calculate the seepage under stable and non-steady states and setting up concrete cutoff walls respectively,in order to study the effect of the random distribution of dam materials on seepage characteristics of landslide dam.The analysis shows that,(a)the distribution of water pressure,seepage flow and infiltration line of landslide dam in different partitions are different whether it is under stable state,non-steady state or after setting concrete cutoff walls,indicating the randomness of constituent materials has a very obvious influence on the seepage characteristics of dam body;and(b)when the permeability coefficients of dam from the top to the bottom and from the upstream to the downstream gradually increase,the seepage of dam body is most unfavorable.In practical engineering,it is necessary to pay attention to the influence of inhomogeneity of dam material on dam body safety and take reasonable anti-seepage measures such as concrete cutoff wall in time.
作者
施睿
孙亚民
雷红军
张雷
SHI Rui;SUN Yamin;LEI Hongjun;ZHANG Lei(School of Electric Power Engineering,Kunming University of Science and Technology,Kunming 650500,Yunnan,China;Huaneng Lancang River Hydropower Inc.,Kunming 650200,Yunnan,China)
出处
《水力发电》
CAS
2023年第3期52-56,共5页
Water Power
基金
国家自然科学基金项目(51869008)。
关键词
堰塞坝
材料随机性
渗流特性
混凝土防渗墙
影响
landslide dam
randomness of constituent material
seepage characteristics
concrete cutoff wall
influence
