摘要
随着我国膜袋坝数量的增多,针对膜袋坝工程特性,分析膜袋坝变形特征及土工膜袋加固机理十分重要。当前计算膜袋坝稳定性及变形特征的方法有水平条分法、基于界面单元的有限元强度折减法等,这些方法不能很好地考虑土工膜袋界面的柔性特征及施工后土工膜袋因不均匀固结与施工错缝导致的土工膜袋界面镶嵌、摩擦等作用。鉴于此,利用离散元方法构建了实体土工膜袋,指出了单个柔性界面的土工膜袋与膜袋坝的建模过程,提出了效率更高且更加符合膜袋坝施工过程的离散元建模方法。通过强度折减的方法,分析膜袋坝稳定性降低过程中受柔性土工膜袋界面镶嵌、摩擦作用影响的膜袋坝变形特征与受力特征。并通过分析土工膜袋在膜袋坝稳定性降低过程中的力学响应,初步揭示了土工膜袋加强坝体稳定性的机理。这些工作为今后分析膜袋坝的工程特性提供了有益的帮助。
With the increase of the number of geotextile tubes dams in China,in view of the engineering characteristics of geotextile tubes dams,it is very important to analyze the deformation characteristics of geotextile tubes dams and the mechanism of geotextile tubes reinforcement.However,the current calculation methods for calculating the stability and deformation characteristics of geotextile tubes dams,such as the horizontal slice method and the strength reduction FEM method based on interface elements,cannot take into account the flexibility characteristics of the geotextile tubes interface and the inconsistency of the geotextile tubes after construction.In view of this,this paper uses discrete elements method to construct a geotextile tubes,details the modeling process of a single flexible interface geotextile tubes and the geotextile tubes dam,and proposes a discrete element modeling method that is more efficient and more in line with the construction process.Through the method of strength reduction,the deformation characteristics and the force characteristics of the geotextile tubes dam affected by the inlay and friction of the flexible geotextile tubes interface in the process of reducing the stability of the geotextile tubes dam are analyzed.And by analyzing the mechanical response of the geotextile tubes in the process of decreasing the stability of geotextile tubes dam,the mechanism of the geotextile tubes strengthening the stability of dam body is initially revealed.These works provide useful help for future analysis of the engineering characteristics of geotextile tubes dams.
作者
刘磊
尚静石
李维朝
王先鹏
高连瑞
LIU Lei;SHANG Jingshi;LI Weichao;WANG Xianpeng;GAO Lianrui(College of Engineering&Technology,China University of Geosciences(Beijing),Beijing 100083,China;State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin,China Institute of Water Resources and Hydropower Research,Beijing 100038,China;Datang Shuangyashan Thermal Power Co.,Ltd,Shuangyashan 155100,China)
出处
《华北水利水电大学学报（自然科学版）》
北大核心
2021年第4期83-91,共9页
Journal of North China University of Water Resources and Electric Power：Natural Science Edition
基金
国家重点试验室项目(SKL2020ZY09)。
关键词
膜袋坝
土工膜袋
强度折减法
离散元法
颗粒流
数值模拟
dam by geotextile tubes
geotextile tubes
strength reduction method
Discrete Element Method(DEM)
Particle Flow Code(PFC)
numerical simulation
作者简介
刘磊(1997-),男,硕士研究生,从事土石坝、地质灾害和环境岩土方面的研究。E-mail:2335462210@qq.com;通信作者:李维朝(1979-),男,教授级高级工程师,博士,从事土石坝、地质灾害和环境岩土方面的研究。E-mail:liwc@iwhr.com。
