| 渗流作用下花岗岩残积土地层深基坑变形研究 |
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| 引用本文： | 高彦,陈凌凡,武睿军,尹紫红.渗流作用下花岗岩残积土地层深基坑变形研究[J].路基工程,2021,0(6):140-145. |
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| 作者姓名： | 高彦 陈凌凡 武睿军 尹紫红 |
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| 作者单位： | 1.中铁二十二局集团第五工程有限公司，重庆 400700 |
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| 基金项目： | 中铁二十二局集团有限公司2019年度科技研究开发计划（19-10C） |
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| 摘 要： | 以广州新建珠三角城际轨道交通马头庄站基坑工程为依托，运用ABAQUS数值模型模拟降水变形与开挖变形从降水开挖引发的耦合变形中分离出来，研究该类特殊地质条件下地下水渗流对深基坑的作用机理及其影响因素。研究结果表明:各阶段降水对围护桩的影响方式有所区别，且第一步降水对桩顶位置的影响更大；当距围护结构1.95He范围以外时，降水期间沉降几乎占据了地表总沉降的80 %以上，其数值不可忽略；坑外土体最大竖向变形位于地表以下，部分土层存在着拉伸变形；止水帷幕深度的加深会引起围护桩侧移与地表沉降增大，需合理选取止水帷幕参数。
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| 关 键 词： | 地铁 变形规律 数值计算 深基坑 花岗岩残积土 地下水渗流 |
| 收稿时间： | 2021-08-18 |
Research on Deformation of Deep Foundation Pit in Granite Residual Soil under Seepage |
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| Abstract: | Based on Matouzhuang Station foundation pit engineering of Guangzhou New Pearl River Delta Intercity Rail Transit, it uses ABAQUS to separate the dewatering deformation and excavation deformation from the coupling deformation caused by dewatering excavation, and studies the mechanism and influencing factors of groundwater seepage on deep foundation pit under such special geological conditions. The results of the research show that: the influence of precipitation in each stage on the retaining pile is different, and the first step precipitation has a greater impact on the pile top position; when the distance from the retaining structure is beyond 1.95 He, the settlement during precipitation accounts for more than 80 % of the total surface settlement, and its value can not be ignored; the maximum vertical deformation of the soil outside the pit is below the surface, and some soil layers have tensile deformation. The deepening of the depth of the water-stop curtain will cause the lateral displacement of the retaining piles and the increase of ground settlement, so the water-stop curtain parameters need to be selected reasonably. |
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