径流-渗流作用下松散土坡非均匀颗粒临界失稳分析  

Critical Instability Analysis of Non-equigranular Particles on Loose Soil Slope Suffering from Runoff-seepage Flow

作　　者：刘悦 袁星宇[1,2] 张帅 符文熹 李龙国[1] LIU Yue;YUAN Xing-yu;ZHANG Shuai;FU Wen-xi;LI Long-guo(State Key Laboratory of Hydraulics and Mountain River Engineering,Sichuan University,Chengdu 610065,China;College of Water Resource and Hydropower,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学水利水电学院,成都610065 [2]四川大学水力学与山区河流保护国家重点实验室,成都610065

出　　处：《中国农村水利水电》2021年第11期9-15,23,共8页China Rural Water and Hydropower

基　　金：国家自然科学基金项目(41772321);四川省科技厅重点研发项目(2020YFN0012,2021YFN0126)。

摘　　要：为研究径流-渗流作用下松散土坡非均匀颗粒起动机理,基于单颗粒滑动、滚动力学分析,构建径流-渗流耦合作用下坡体非均匀颗粒稳定分析模型,采用Navier-Stokes方程和扩展Brinkman-Darcy方程描述坡面径流和坡体渗流,结合连续性方程和应力跳跃边界条件,推导了流固界面流速具体表达式,得到了考虑径流-渗流联动作用的单颗粒稳定安全系数。结果表明:颗粒稳定安全系数主要受到坡面径流水深、松散层厚度、土坡坡度、应力跳跃系数、土体内摩擦角、颗粒等效粒径及容重、松散土坡孔隙率及渗透率的影响;土坡坡度、土体内摩擦角、颗粒容重为抗滑安全系数敏感参数;土坡坡度、颗粒容重、坡面径流水深、土坡渗透率为抗滚动安全系数敏感参数。In order to study the initiation mechanism of non-equigranular particles on loose soil slope under the runoff-seepage coupling effect,a stability analysis model of particles is constructed based on sliding and rolling mechanical analyses of single particle,and the Navier–Stokes Equation and Brinkman extended Darcy Equation are used to describe slope runoff and seepage respectively.Combined with the continuity equation and stress jump conditions,the concrete expression of the fluid-solid interface velocity is calculated,and stability safety factors of single particle under the runoff-seepage linkage effect is obtained.The results show that stability safety factors of particles are mainly affected by runoff depth on the slope surface,thickness of loose layers,slope gradient,stress jump coefficients,soil internal friction angles,equivalent diameters and volumetric weight of particles,porosity and permeability of loose soil slopes;slope gradients,soil internal friction angles and volumetric weight of particles are sensitive parameters of anti-slide safety factors;slope gradients,volumetric weight of particles,runoff depth on the slope surface and permeability of loose soil slope are sensitive parameters of anti-roll safety factors.

关 键 词：松散土坡 非均匀颗粒 流固耦合 应力跳跃边界 安全系数 

分 类 号：TV142.1[水利工程—水力学及河流动力学]