摘要
坡地地下室底板抗浮失效问题时有发生,并以强降雨条件为甚。然而,针对其抗浮水头方面的研究还鲜有报道,已有设计规范也没有可供参考的规定。对坡地透水层承压、潜水运动机理进行分析,提出承压-潜水耦合模型,基于达西定律和Dupuit假定,采用改进阻力系数法考虑底板、侧墙水头损失,建立抗浮水头理论公式。以底板坡度、坡顶侧和坡底侧水位为参数,设计50个算例,采用Geostudio-Seep/W软件建立渗流有限元模型,将有限元分析与理论计算结果进行比较,分析坡底、坡顶水位及底板坡度对抗浮水头的影响,并采用工程实例对计算方法进行验证。结果表明:承压、潜水与底板三者交界位置的水头随底板坡度增加而减少,随坡顶水位、底板坡度和坡顶底水位差的增加而增加;坡顶水位对底板抗浮水头的影响随坡底水位增加而降低,反之亦然;抗浮水头理论计算值与有限元分析结果的偏差在2.65%以内,且理论计算结果与工程实例相符,理论公式能反映坡地地下室底板下部的渗流特性。
When the basement floor has the problem of solid rainfall,the basement floor will fail.However,there are few reports on the research on its anti floating head,and there are no provisions for reference in the existing design codes.The pressure-bearing and diving motion mechanism of the porous layer on sloping ground is analyzed,and the pressure-submersion coupling model is proposed.Based on Darcy's law and Dupuit's assumption,the improved resistance coefficient method is used to consider the head loss of the floor and sidewalls,and the theoretical formula of the anti-floating head is established.Taking the slope of the bottom plate,the water level of the top side and the bottom side of the slope as parameters,50 calculation examples were designed.Geostudio-Seep/W software is used to establish a finite element model of seepage.The finite element analysis is compared with the theoretical calculation results to analyze the influence of the water level at the bottom of the slope,the water level at the top of the slope,and the floor's slope against the floating head.Engineering examples verify the calculation method.The results show that the water head at the junction of confined water,phreatic water and floor decreases with the increase of floor slope and increases with the growth of slope top water level,floor slope and water level difference between slope top and bottom.The influence of the water level at the top of the slope on the anti floating head of the bottom plate decreases with the increase of the water level at the bottom of the slope,and vice versa.The deviation between the theoretical calculation value of the anti-floating head and the finite element analysis results is within 2.65%.The theoretical calculation results are consistent with the engineering examples.
作者
林拥军
张曾鹏
方言
余国菲
LIN Yong-jun;ZHANG Zeng-peng;FANG Yan;YU Guo-fei(School of Civil Engineering,Southwest Jiaotong University,610031,Chengdu,China;Chengdu Guanghua Smart Parking Lot Construction Co.,Ltd.,610072,Chengdu,China)
出处
《建筑技术》
2023年第6期757-763,共7页
Architecture Technology
基金
中国–印尼高铁技术联合研究中心项目(KY201801005)。
关键词
承压–潜水
耦合
地下室底板
抗浮水头
渗流
pressure-diving
coupling
basement floor
anti-floating head
seepage
