雷诺护垫护岸对粉细砂岸坡的防护效果数值模拟分析  

Numerical Simulation Analysis of Protection Effect of Raynaud Pad Revetment on Silty Sand Bank Slope

作　　者：徐立君[1] 王敦格 刘延飞 程永舟[2] XU Li-jun;WANG Dun-ge;LIU Yan-fei;CHENG Yong-zhou(Hunan Polytechnic of Water Resources and Electric Power,Changsha 410114,Hunan Province,China;School of Hydraulic and Environmental Engineering,Changsha University of Science and Technology,Changsha 410114,Hunan Province,China)

机构地区：[1]湖南水利水电职业技术学院,湖南长沙410131 [2]长沙理工大学水利与环境工程学院,湖南长沙410114

出　　处：《中国农村水利水电》2023年第12期195-200,206,共7页China Rural Water and Hydropower

基　　金：湖南省水利科技项目(XSKJ2021000-44)。

摘　　要：粉细砂质河岸易崩塌,以湘江部分粉细砂河段为研究对象,通过有限差分软件FLAC3D,基于流-固耦合理论和强度折减法,结合所选河段粉细砂岸坡地形及土体资料,提出雷诺护垫防护结构,建立三维岸坡防护模型,探讨雷诺护垫护岸结构对岸坡稳定性的影响。结果表明,雷诺护垫-格宾石笼网箱结构方案防护在限制岸坡水平方向和垂直方向位移的效果显著,其最小安全系数高,易操作,防冲性能好,使用寿命长,不需要定期维修养护,可有效提高粉细砂岸坡整体稳定性。There are many large rivers in China.Under the conditions of internal soil properties and external rainfall discharge,soil and water exchange occurs between soil and river flow on the bank slope,which leads to the instability and slip on the bank slope easily.Many river⁃bank slopes are binary riverbank structures dominated by silty sand soils,which have prominent security and stability problems.By taking part of the silty sand reaches of the Xiangjiang River as the research object,this paper uses the finite difference software FLAC3D,based on the fluid-solid coupling theory and strength reduction method,combined with the silty sand bank slope topography and soil data of the select⁃ed river reach,Rayno protective structure is proposed.A three-dimensional model of bank slope protection is established to study the influ⁃ence of Raynaud gaspe-Gabion cage structure protection on bank slope stability from the aspects of bank slope stress field,displacement field,shear strain increment and safety factor.Raynaud’s pad produces a large compressive stress on the bank slope soil due to its own weight,which weakens the soil tension,but has no significant effect on the soil stress distribution.The revetment scheme has an obvious pro⁃tective effect on the horizontal displacement of the bank slope,the maximum displacement is reduced from 0.61 m to 0.19 m,the vertical dis⁃placement of slope foot is reduced from 0.17 m to 0.03 m,and the vertical settlement displacement of slope top is reduced from 0.28 m to 0.07 m. Under the protection of Rayon’s pad, the range of shear strain increment of the bank slope is significantly reduced, the effectiveplastic strain zone is significantly less than that of the unprotected bank slope, and the maximum value of shear strain increment is also small⁃er than that of the unprotected bank slope, the shear stress of the soil mass is weakened, and the maximum area appears at the foot of theslope and the junction between the silty sand soil layer and the sandy mudstone basement. In th

关 键 词：粉细砂岸坡 数学模型 雷诺护垫 岸坡稳定性 

分 类 号：TV861[水利工程—水利水电工程]