摘要
为研究人工黄土坡面重力侵蚀现象,通过应用有限差分软件FLAC3D对复杂侵蚀地形模型进行二次开发,分析坡面重力侵蚀过程,并对坡面位移场、应力场和塑性屈服区进行了数值模拟。结果表明:通过软件建立的三维模型能真实地还原侵蚀坡面地形地貌,仿真效果良好;通过监测点位移规律,将侵蚀分为3个阶段,坡面下部侵蚀发育阶段要早于坡面中上部侵蚀发育完成;坡面位移以向下侵蚀滑落为主,且随坡度增加导致应力集中,在一定程度上坡度的增加,加剧了重力侵蚀的发生;通过对三次连续性降雨坡面进行受力分析,发现本场次侵蚀地形基本符合上一场模型平衡状态时的塑性区分布情况,说明FLAC3D在一定程度上能够对侵蚀地形发育起到预测的作用。
In order to study the gravity erosion phenomenon of artificial loess slope,the finite difference software FLAC3 D is used to redevelop the complex erosion terrain model,and the gravity erosion process on the slope is analyzed.The slope displacement field,stress field and plastic yield zone were analyzed.The results show that the three-dimensional model established by software can truly restore the topography of the erosion slope,and the simulation effect is good.By monitoring the displacement law of the point,the erosion is divided into three stages,and the erosion development stage of the lower part of the slope is earlier than the upper part of the slope.The erosion development is completed;the displacement of the slope is mainly sedimentation,and the stress concentration is caused by the increase in the slope.To a certain extent,the increase in the slope aggravates the occurrence of gravity erosion.By analyzing the stress of three consecutive rainfall slopes,it is found that the erosion terrain of the field is basically consistent with the distribution of the plastic zone in the equilibrium state of the previous model,indicating that FLAC3 D can predict the development of the erosion terrain to a certain extent.
作者
金鑫
刘喆
王春振
宋颖
赵华荣
王迪
李霞
JIN Xin;LIU Zhe;WANG Chun-zhen;SONG Ying;ZHAO Hua-rong;WANG Di;LI Xia(Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology,Guilin University of Technology,Guilin 541004,Guangxi,China;Collaborative Innovation Center for Water Pollution Control and Water Security in Karst Areas,Guilin University of Technology,Guilin 541004,Guangxi,China)
出处
《中国农村水利水电》
北大核心
2020年第8期40-45,共6页
China Rural Water and Hydropower
基金
国家自然科学基金项目(51369009)
广西自然科学基金项目(2016GXNSFAA380116)
广西矿冶与环境科学实验中心,广西高等学校高水平创新团队及卓越学者计划项目(002401013001)。
关键词
人工黄土坡面
数值模拟
重力侵蚀
artificial loess slope
numerical simulation
gravity erosion
