摘要
针对刚性衬砌渠道冻胀破坏问题,选取宁夏盐环定扬黄灌区衬砌渠道为研究对象,在考虑相变及水分迁移模型基础上,考虑高地下水位对冻胀的影响,建立考虑水分迁移及地下水影响的数学物理模型,并采用Comsol Mutiphysics有限元软件对梯形渠道混凝土衬砌进行冻胀数值模拟,分别从温度场、位移场和应力场对刚性衬砌渠道冻胀破坏等方面进行了研究分析。结果表明:阴坡、阳坡冻胀量较大,渠底较小,渠底中部、渠坡1/3坡板长度处冻胀量分别达到最大值。渠底中部的法向冻胀力较小,两边逐渐增大,阴坡、阳坡的法向冻胀力分布均匀;渠底的切向冻结力成线性分布。阴坡、阳坡靠近坡脚处切向冻结力较大,左、右两端坡顶处切向冻结力较小,渠底衬砌板和两侧衬砌板属于压弯组合变形构件。
In view of the problem of frost heaving and damage of rigid lining channel , the lining channel ofYanhuanding irrigation area in Ningxia was selected as the research object. On the basis of the model considering phase change and water transfer , the influence of high ground water level on the frost heave was considered , a mathematical physical model considering water migration and the influence of groundwater was established and Comsol Mutiphysics was adopted. The finite element software was used to numerical simulate the frost heaving of the concrete lining of the trapezoid channel and the frost heaving damage of the rigid lining channel was studied and analyzed from the temperature field , the displacement field and the stress field respectively. The results show that the frost heaving amount of shady slope and sunny slope is large and the canal bottom is small. In the middle of the canal bottom , the frost heaving amount at the length of 1 / 3 of the canal slope reaches the maximum value respectively. The normal frost heave force in the middle of the canal bottom is smaller , the sides increase gradually , the normal frost heave force distribution on the shady slope and sunny slope is uniform and the tangential freezing force at the bottom of the canal is linearly distributed. The shady slope and the sunny slope close to the foot of the slope have a greater tangential freezing force , while the tangential freezing force is less at the top of the slope on the right and left ends , the bottom lining slab and the two lining slab are bent and combined deformation members. The correlative research can provide beneficial reference for the treatment of frost heaving damage and protection of lining channels in cold and dry irrigation areas.
作者
张海晨
李振
张茂林
姚志鹏
朱兴林
王铭岩
ZHANG Haichen;LI Zhen;ZHANG Maolin;YAO Zhipeng;ZHU Xinglin;WANG Mingyan(Ningxia Water Conservancy Project Construction Administration,Yinchuan 750001,China;School of Water Conservancy,North China University of Water Resources and Electric Power,Zhengzhou 450046,China;Jingtaichuan Pumping?Irrigation Authority of Gansu Province,Jingtai 730400,China)
出处
《人民黄河》
CAS
北大核心
2019年第3期156-160,共5页
Yellow River
基金
国家自然科学基金资助项目(51579102
31360204)
河南省科技厅科技创新人才支持计划项目(174200510020)
河南省高校科技创新团队支持计划项目(19IRTSTHN030)
宁夏回族自治区水利科技专项(TYZB-ZFCG-2017-31)
关键词
渠道
衬砌
数值模拟
冻胀破坏
寒旱区
channel
lining
numerical simulate
frost heaving damage
cold and arid areas