弹性波穿越土工袋传播规律的数值模拟  

A preliminary study on the propagation law of elastic wave through a soilbag

作　　者：贾凡 刘斯宏[2] 程宏旸 JIA Fan;LIU Sihong;CHENG Hongyang(State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin,China Institute of Water Resources and Hydropower Research,Beijing 100038,China;College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China;University of Twente,Enschede 7500AE,Netherlands)

机构地区：[1]中国水利水电科学研究院流域水循环模拟与调控国家重点实验室,北京100038 [2]河海大学水利水电学院,江苏南京210098 [3]University of Twente,Enschede 7500AE

出　　处：《河海大学学报（自然科学版）》2022年第6期108-113,共6页Journal of Hohai University(Natural Sciences)

基　　金：国家重点研发计划(2017YFE0128900);国家建设高水平大学公派研究生项目(201906710148)。

摘　　要：采用离散单元法对土颗粒地基模型与埋设单层土工袋的土颗粒地基模型进行弹性波传播的数值模拟,研究地基中土工袋对弹性波波速及地基阻尼比的影响。结果表明:地基中土工袋的存在使弹性波的波速略有降低,并降低了地基的品质因子Q。弹性P波(压缩波)与S波(剪切波)穿越土工袋时波速变化规律大体相近,在100 kPa围压和输入500 Hz弹性波条件下,单个土工袋对弹性波的衰减作用主要集中在穿越土工袋上、下层土工合成材料界面之前。Using the discrete element method(DEM),a series of numerical simulations of elastic wave propagation are carried out on the particle models of pure soil foundation and soil foundation containing a single-layered soilbag.The influence of the soilbag in the foundation on the elastic wave velocity and the damping of foundation is studied.Numerical simulation results show that the existence of soilbag in the foundation slightly reduces the elastic wave velocity and reduces the quality factor Q of the foundation.The change laws of elastic P-wave velocity and S-wave velocity are roughly the same when they pass through the soilbag.Under the condition of 100 kPa confining pressure and 500 Hz elastic wave input,the attenuation effect of a soilbag on the elastic wave is mainly concentrated when passing through the upper and lower geosynthetic interface.

关 键 词：颗粒材料 土工袋 弹性波传播 波速 品质因子 

分 类 号：TU47[建筑科学—结构工程]