| 深软场地地铁狭长深基坑变形特征实测与已有统计结果的对比分析 |
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| 引用本文： | 庄海洋,张艳书,薛栩超,徐 烨.深软场地地铁狭长深基坑变形特征实测与已有统计结果的对比分析[J].岩土力学,2016,37(Z2):561-570. |
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| 作者姓名： | 庄海洋 张艳书 薛栩超 徐 烨 |
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| 作者单位： | 1.山东大学 土建与水利学院，山东 济南 250061；2.南京工业大学 岩土工程研究所，江苏 南京 210009；
3.绿地城市投资集团有限公司，上海 200023 |
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| 基金项目： | 中国博士后基金（No. 2014M551909）；江苏省地质矿产勘查局科研项目（No. 2013-科研-13）。 |
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| 摘 要： | 以上海地区某深软场地地铁狭长深基坑为工程背景，对开挖引起的地表和周边建筑物沉降、地下连续墙侧移、墙顶和立柱竖向位移等的监测数据进行了详细地统计和分析，探讨了深软场地狭长深基坑变形的时空分布特征及其主要诱因。对比分析实测墙体最大侧移?hm和最大地表沉降?vm与已有统计结果和经验预测结果，结果表明深软场地狭长深基坑的变形时空效应非常明显。与已有上海地区深基坑工程实测统计得出的地表沉降预测结果相比，狭长基坑周围地表沉降曲线基本符合已有的经验预测结果，但与已有的实测统计结果相比，实测墙体最大侧移?hm和最大地表沉降?vm与开挖深度的比值平均线明显低于已有的统计结果，主要原因是针对地铁狭长深基坑特点采用的地连墙和多层内支撑的围护结构体系明显区别于一般深基坑的围护结构体系所造成的，表明该围护结构体系能够很好地控制狭长深基坑的变形发展。
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| 关 键 词： | 深软场地 深基坑 地铁地下车站 现场监测 统计分析 |
| 收稿时间： | 2016-06-22 |
Deformation characteristics of narrow-long deep foundation pit for subway station in soft ground and compared with existing statistical results |
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| ZHUANG Hai-yang,ZHANG Yan-shu,XUE Xu-chao,XU Ye.Deformation characteristics of narrow-long deep foundation pit for subway station in soft ground and compared with existing statistical results[J].Rock and Soil Mechanics,2016,37(Z2):561-570. |
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| Authors: | ZHUANG Hai-yang ZHANG Yan-shu XUE Xu-chao XU Ye |
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| Institution: | 1. School of Civil and Hydraulic Engineering, Shandong University, Jinan, Shandong 250061, China;
2. Institute of Geotechnical Engineering, Nanjing University of Technology, Nanjing, Jiangsu 210009, China;
3. Greenland Urban Investment Group Co., Ltd., Shanghai 200023, China |
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| Abstract: | To a deep and narrow foundation pit for a subway underground station in a soft ground of Shanghai, a detailed statistical analysis based on the site monitoring database has been conducted on the settlements of the ground surface and the surrounding buildings, the horizontal displacement of diaphragm wall, the uplift of the diaphragm wall and the upright column. Then, the spatiotemporal developing characteristics of deformation and the corresponding incentive are analyzed. Meanwhile, the relationships among the maximum lateral displacement of diaphragm wall ?hm, the maximum ground surface settlement ?vm and the existing statistical results are also compared and analyzed. The results show that the deformation spatiotemporal effect of a long and narrow deep foundation pit in soft ground is quite obvious. Compared with the predicted results obtained from the site monitoring database of some deep foundation pits in Shanghai area, the relationship curves between the ground surface settlement and the depth of the foundation pit is lower than that given before ones obviously. To the maximum ground settlement ?vm of the ground surface, the above finding is also existing. The main reason is that the supporting system for a narrow and long foundation pit is different from that for a general deep foundation pit, which proves that the diaphragm wall with the multilayer horizontal inner symmetrical supports can control the deformation of a narrow and long foundation pit for subway underground station built in soft ground. |
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| Keywords: | thick and soft site deep foundation pit subway underground station site monitoring statistical analysis |
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