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fill load
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The floppy tip ground have two characters,one is that the soil is floppy and the other is that there is a slope on the surface or in the base of the soil.There are two floppy tip ground in the railway and highway construction of China in southwest,one is the slope of soft soil,the other is the slope of rock fill.In the earthwork on a floppy tip ground,the vertical compaction deformation takes place,and as the fill load...

The floppy tip ground have two characters,one is that the soil is floppy and the other is that there is a slope on the surface or in the base of the soil.There are two floppy tip ground in the railway and highway construction of China in southwest,one is the slope of soft soil,the other is the slope of rock fill.In the earthwork on a floppy tip ground,the vertical compaction deformation takes place,and as the fill load increase,the transverse compaction deformation will take place in the soil at the same time.For the floppy tip ground,when the shear stress caused by additional stress is bigger than the allowable shear stress,some measures like as anchor piles for restricting transverse compaction distortion are required.

松软倾斜地基 ,有两个特征 :一是地基土体松散 ,具有低强度和可压缩性 ;二是地基表面或松软层底部 ,有一定的向外的斜坡。在西南山区铁路公路建设中 ,多见两类典型的松软倾斜地基 :一是斜坡软土 ,二是松散的岩堆坡地。在松软倾斜地基上填方 ,随填土荷载增加 ,土体产生竖向压密变形 ;在产生竖向压密变形的同时 ,土体产生横向变形 ,且变形范围随填土荷载应力增加而加大 ,当土体抗剪强度小于填土附加应力产生的横向剪应力时 ,土体发生剪切破坏 ,随剪切范围加大地基发生破坏。对于松软倾斜地基 ,当填土附加应力产生的剪应力大于土体容许剪应力时 ,应首先考虑采取限制土体侧向变形的侧向约束措施 ,如锚固桩。

A long term observation was performed for the north part connection of the Second Yangtze River Bridge Project at the Yongliu Highway to disclose the stress and deformation of the composite foundation under fill loading. The results show that the settlement induced deformation of the subgrade was effectively controlled after consolidation with deep mixing piles, that the settlement of the consolidated region was small, the settlement of the substratum was large, and the total settlement satisfied the...

A long term observation was performed for the north part connection of the Second Yangtze River Bridge Project at the Yongliu Highway to disclose the stress and deformation of the composite foundation under fill loading. The results show that the settlement induced deformation of the subgrade was effectively controlled after consolidation with deep mixing piles, that the settlement of the consolidated region was small, the settlement of the substratum was large, and the total settlement satisfied the requirement of the design criterion, that the settlement of the soil between the piles decreased with increasing depth and gradually became smaller than that of piles, and a settlement contour of piles and the soil around piles existed in this process, and that the stresses of piles and soil changed dynamically: in the loading process, stresses of piles were relatively concentrated, and during the interval, the pile soil stress ratio reduced, reflecting the coordinated action between piles and soil in the process of loading transfer.

结合雍六高速公路长江二桥江北接线工程 ,对填土荷载下复合地基的应力、变形特性进行了长期现场观测研究 .结果表明 :路基经深搅桩加固后 ,沉降变形得到有效控制 .加固区沉降量较小 ,下卧层沉降量较大 ,总沉降量满足设计及规范的要求 ;柔性路堤下桩与桩间土的沉降规律有差别 ,桩身上部桩周土沉降较大 ,随着深度增加 ,桩周土沉降逐渐小于桩的沉降 ,在这个过程中 ,桩与桩周土存在等沉面 ;在填土加荷过程中 ,桩与土各自分担的应力处在动态的变化之中 :加荷时 ,桩上应力相对集中 ;间歇期 ,桩土应力比减小 ;体现了荷载传递过程中桩与土是相互协调作用的

Using a numerical method,the global stability and movement response of bottomland region subjected to fill loading is discussed,and the influence of fill on surroundings is evaluated.

本文通过数值分析的方法,对填方下滩涂区的整体稳定和位移场进行分析,评价填方对周边环境的影响.

 
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