摘要
为研究北疆膨胀土梯形渠道混凝土衬砌结构变形和内力的变化规律,通过室内试验和数值模拟计算基土膨胀变形量,基于弹性地基梁理论,建立计算混凝土衬砌板变形和内力的力学模型,分析了基土初始含水率为6%、9%、12%、15%的膨胀土渠道运行后混凝土衬砌板变形和内力的变化规律。结果表明,混凝土衬砌板变形和内力值随基土初始含水率的减小而增加,当基土为风干含水率6%时,渠道底板和坡板膨胀变形最大值分别可达到3.48、3.94 cm;当初始含水率一定时,坡脚处膨胀反力最大,渠底板中间位置位移和弯矩最大;渠坡板距坡脚1/3处位移最大,距坡脚1/6处弯矩最大。最后,根据研究结果提出了两种“防渗保湿”工程措施。
In order to study the deformation and internal force of concrete lining structure of expansive soil trapezoidal channel in northern Xinjiang,indoor test and numerical simulation were used to calculate expansive deformation of foundation soil.Based on the beam theory of elastic foundation,a mechanical model was established to calculate the deformation and internal force of concrete lining slab.The deformation and internal force of concrete lining slabs were calculated and analyzed after the operation of the channel with the initial moisture content of the foundation soil being 6%,9%,12%and 15%.The results show that the deformation and internal force of the concrete lining plate increase with the decrease of the initial moisture content of the foundation soil.When the moisture content of the foundation soil is 6%,the maximum expansive deformation of the channel floor and slope plate can reach 3.48 cm and 3.94 cm.When the initial water content is constant,the expansion reaction force is the largest at the foot of the slope,and the displacement and bending moment are the largest at the middle of the bottom plate.The displacement of channel slope plate is the largest at one third of the slope foot,and the bending moment is the largest at one sixth of the slope foot.Finally,according to the research results,two engineering measures of"anti-seepage and moisturizing"were proposed.
作者
杨涛
喻天龙
姜海波
YANG Tao;YU Tian-long;JIANG Hai-bo(College of Water&Architectural Engineering,Shihezi University,Shihezi 832003,China;Xinjiang Corps Survey and Design Institute(Group)Co.,Ltd.,Shihezi 832oo3,China)
出处
《水电能源科学》
北大核心
2023年第2期163-167,99,共6页
Water Resources and Power
基金
国家自然科学基金项目(51769031)
兵团区域创新引导计划(青年科技骨干人才培养)(2021BB004)。
关键词
膨胀土
梯形渠道
膨胀变形
衬砌结构
弹性地基梁
力学模型
expansive soil
trapezoidal channel
expansion deformation
lining structure
elastic foundation beam
mechanical model
