| 微倾斜场地中地铁地下结构周围地基液化与变形特性振动台模型试验研究 |
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| 引用本文： | 庄海洋,付继赛,陈苏,陈国兴,王雪剑.微倾斜场地中地铁地下结构周围地基液化与变形特性振动台模型试验研究[J].岩土力学,2019,40(4):1263-1272. |
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| 作者姓名： | 庄海洋 付继赛 陈苏 陈国兴 王雪剑 |
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| 作者单位： | 1. 南京工业大学 岩土工程研究所，江苏 南京 210009；2. 中国地震局地球物理研究所，北京 100081 |
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| 基金项目： | 国家自然科学基金面上项目(No. 51778290)；国家自然科学基金青年项目(No. 51508526)；江苏省高校自然科学基金重大项目(No. 16KJA560001)。 |
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| 摘 要： | 强震中场地砂土液化产生的土层侧移对地面建筑结构和地下生命线工程造成了严重的破坏。可以预见，微倾斜液化场地的土层侧移也将对地铁地下结构的地震安全造成严重的威胁。鉴于此，开展了微倾斜（倾角为6o）可液化场地中两层三跨地铁地下车站结构与区间隧道连接部位地震反应的大型振动台模型试验研究。结果表明：微倾斜可液化场地中地铁车站结构两侧地基出现了明显的非对称液化分布特征，坡体下方水平土层比上方水平土层更易液化；因坡体内土体液化沿坡向下流滑引起了下方水平土层发生了明显的地面抬升，总体上坡体段内的地面侧移量最大，下方水平土层地面侧移量次之，坡体上方水平土层地面侧移量最小。同时，在试验过程中也发现，隧道和车站结构之间发生了明显的差异上浮，可能会造成连接部位附近结构的应力集中或加重该部位的地震破坏。
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| 关 键 词： | 微倾斜场地 砂土液化 土层侧移 地铁地下结构 振动台模型试验 |
| 收稿时间： | 2017-11-28 |
Liquefaction and deformation of the soil foundation around a subway underground structure with a slight inclined ground surface by the shaking table test |
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| ZHUANG Hai-yang,FU Ji-sai,CHEN Su,CHEN Guo-xing,WANG Xue-jian.Liquefaction and deformation of the soil foundation around a subway underground structure with a slight inclined ground surface by the shaking table test[J].Rock and Soil Mechanics,2019,40(4):1263-1272. |
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| Authors: | ZHUANG Hai-yang FU Ji-sai CHEN Su CHEN Guo-xing WANG Xue-jian |
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| Institution: | 1. Institute of Geotechnical Engineering, Nanjing Tech University, Nanjing, Jiangsu 210009, China;
2. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China |
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| Abstract: | In a strong earthquake, the liquefaction-induced lateral deformation of ground has induced severe damages to the ground structures and the underground lifeline engineering. It is foreseeable that the safety of subway underground structure is seriously threatened by the seismic liquefaction-induced lateral deformation of ground. For this reason, the earthquake response of a subway underground structure buried in a soil foundation with a slight inclined ground surface was investigated by shaking table tests. The results demonstrated that the soils beside the underground structure were not liquefied synchronously with the soils near the slope toe were easier to be liquefied than the soils near the slope top. When the soils in the slope was liquefied, they would flow down along the slope, which can induce the uplift of the ground surface near the slope toe. Meanwhile, it was found that the lateral deformation of soil in the slope was larger than that of soil near the slope toe, and the lateral deformation of soil near the slope top was smallest. The results also revealed that the underground subway station floated more severely than that of connected tunnel, which could induce seismic damage at the connection part between the tunnel and subway station. |
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| Keywords: | slight inclined ground sand liquefaction lateral deformation of soil subway underground structure shaking table test |
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