岩体强度与摩擦因数对滑坡涌浪特征的影响
Research on the Influence of Rock Mass Strength and Friction Coefficient to the Rock Landslide and Surge Process
李承德 1姚池 1李恒宇 1孙哲劼 1汪继力 1叶承1
作者信息
- 1. 南昌大学 工程建设学院,江西 南昌 330031
- 折叠
摘要
库区岩体失稳滑坡进而引起涌浪会对水工建筑物及下游的安全造成重大威胁.岩质滑坡体在滑坡过程中可能发生断裂破碎,影响后续涌浪灾变过程.岩体强度与摩擦因数是影响岩体断裂破碎的重要因素,通过开展三维滑坡涌浪数值试验,模拟了不同岩体强度及摩擦因数工况的滑坡涌浪全过程,分析了滑坡体运动特征与涌浪特性.结果表明:随着岩体强度增大,滑坡体破碎程度逐渐降低,速度与动能逐渐增大,涌浪最大波高与最大爬高也逐渐增大;岩体强度较高的滑坡体以较高速度冲入河道,极端情况下甚至可能撞击对岸岩体引发新的滑坡灾害;摩擦因数越小,滑坡体速度与动能越大,涌浪最大波高与最大爬高也越大,当摩擦因数很小时,低强度的岩体沿滑动面下滑过程中可能不发生破碎,导致涌浪最大波高与最大爬高骤增.
Abstract
The surge caused by rock mass instability and landslide in reservoir area will poses a great threat to the safety of hydraulic struc-tures and downstream.The rock landslide mass may fracture and break during the landslide process,affecting the subsequent surge disaster process.The strength and friction coefficient of rock mass are the important factors that affect the fracture and fragmentation of rock mass.Through the three-dimensional numerical experiment of landslide surge,the whole process of landslide surge under different rock mass strength and friction coefficient conditions was simulated,and the motion characteristics and surge characteristics of landslide were analyzed.The results show that with the increase of rock mass strength,the degree of landslide fragmentation gradually decreases,the velocity and ki-netic energy gradually increase,and the maximum wave height and maximum climbing height of surge also gradually increase.What's more,the landslide mass with high rock mass strength enters into the channel at a high speed,in an extreme case,it may even impact the rock mass on the opposite bank to cause new landslide disasters.Moreover,the smaller the friction coefficient is,the greater the velocity and ki-netic energy of the landslide mass are,and the greater the maximum wave height and the maximum climbing height are.When the friction co-efficient is very small,the rock mass with low strength may not break during the sliding process along the sliding surface,resulting in a sud-den increase in the maximum wave height and maximum climbing height of the surge.
关键词
岩质滑坡/涌浪/岩体强度/摩擦因数/数值模拟Key words
rock landslide/surge/strength of rock/friction coefficient/numerical experiment引用本文复制引用
基金项目
&&(9181-91210074)
江西省双一流建设专项(十四五)(28140002)
出版年
2024
国家科技期刊平台
NSTL
万方数据