摘要
文章依托实际吹填土真空加固工程,从现场试验和数值模拟两方面对真空预压软土加固效果进行评价,着重探讨真空预压软土加固过程中土体孔隙水压力变化规律及加固区土体的变形特性。结果表明:预压期间地面沉降越大,加固效果越好,工后沉降越小;加固区深层土体水平位移指向加固区内,最大水平位移量发生在地表位置;最大水平位移速率发生在加载初期;土体孔隙水压力的消散与土层渗透性相关;地基沉降在抽气加固区地表最大,距离排水板区域越远土体竖向沉降越小,呈现出类似“盆”的沉降形式。真空预压加固法存在一定“有效深度”,排水板的影响深度并非随着插板深度一直增加,而是存在“极限深度”。
This paper relies on actual dredger fill vacuum reinforcement projects.The effect of vacuum preloading on soft soil is evaluated using the field test and numerical simulation in this study.The development of pore water pressure in the soil and the deformation characteristics of the soil in the reinforced area are discussed.The results show that the greater the ground settlement during the preloading period,the better the reinforcement effect,and the smaller the post-construction settlement.The horizontal displacement direction of deep soil in the reinforcement area points to the reinforcement area,and the maximum horizontal displacement occurs on the surface.The maximum horizontal displacement rate occurs at the initial stage of loading.The dissipation of soil pore water pressure is related to soil permeability.The ground settlement is the largest in the pumped air reinforcement area,and the vertical settlement of soil becomes smaller the farther away from the drainage plate area,showing a similar settlement form of"basin".There is a certain"effective depth"in the vacuum precompression reinforcement method,and the influence depth of the drainage plate does not increase with the depth of the insert plate,but there is a"limit depth".
作者
蔡君
CAI Jun(Jiangsu Zhongshe Group Co.,Ltd,Wuxi Jiangsu 214125 China)
出处
《江苏建筑》
2024年第3期119-124,共6页
Jiangsu Construction
关键词
真空预压法
吹填土
现场试验
数值模拟
vacuum preloading method
dredger fill
field test
numerical simulation