| 超重力振动台柔性叠层箱剪切效能评价方法 |
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| 引用本文： | 王体强,王永志,张雪东,汤兆光,段雪锋.超重力振动台柔性叠层箱剪切效能评价方法[J].岩土力学,2022,43(3):719-728. |
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| 作者姓名： | 王体强 王永志 张雪东 汤兆光 段雪锋 |
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| 作者单位： | 1. 中国地震局工程力学研究所 地震工程与工程振动重点实验室，黑龙江 哈尔滨 150080；
2. 中国水利水电科学研究院 岩土工程研究所，北京 100048 |
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| 基金项目： | 国家自然科学基金项目（No.51609218）；;黑龙江省自然科学基金资助项目（No.YQ2019E035）~~； |
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| 摘 要： | 针对超重力振动台试验场地边界效应和新研制的一套柔性叠层箱，设计与开展干砂、纯水离心模型对比试验，引入加速度峰值误差EPGA、归一化均方误差NMSE、峰值频率误差EF等指标，评价了该叠层箱的剪切效能和边界效应。结果表明：与土体中心加速度相比，干砂模型叠层梁的EPGA、NMSE和EF，最大分别为21.50%、21.36%和3.1%，表明该叠层箱具有较好剪切效能。相同动荷载条件下，干砂模型各叠层梁的加速度峰值和峰值频率，最高是纯水模型的2.37倍和2.23倍，说明干砂试验中叠层梁的响应被土体响应控制，进一步验证了叠层箱具有良好剪切效能。干砂模型叠层梁与土体中心的剪切模量和阻尼比基本一致，误差分别为3%和18%；纯水模型叠层梁的剪切模量为干砂模型的1/3，仅为9.22 MPa；但阻尼比较大，为34.8%。以加速度峰值误差5%为边界效应临界距离，该叠层箱中心处约90 cm×24 cm范围内的测试结果是有效和可靠的。提出的方法与结论，对评价超重力振动台叠层箱边界效应具有重要指导意义和应用价值。
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| 关 键 词： | 超重力振动台 柔性叠层箱 边界效应 评价指标 校验方法 |
| 收稿时间： | 2021-07-05 |
| 修稿时间： | 2021-12-15 |
Shear performance evaluation of a flexible laminar container with hypergravity shaking table tests |
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| WANG Ti-qiang,WANG Yong-zhi,ZHANG Xue-dong,TANG Zhao-guang,DUAN Xue-feng.Shear performance evaluation of a flexible laminar container with hypergravity shaking table tests[J].Rock and Soil Mechanics,2022,43(3):719-728. |
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| Authors: | WANG Ti-qiang WANG Yong-zhi ZHANG Xue-dong TANG Zhao-guang DUAN Xue-feng |
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| Institution: | 1. Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin, Heilongjiang 150080, China; 2. Department of Geotechnical Engineering, China Institute of Water Resources and Hydropower Research, Beijing 100048, China |
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| Abstract: | Aiming at the site boundary effects on the hypergravity shaking table, with the benefits of a newly developed flexible laminar container, we design and carry out comparison tests between the dry sand and the water centrifugal model. We introduce the metrics including the acceleration peak error EPGA, the normalized mean square error NMSE, and the peak frequency error EF, to evaluate the shear efficiency and boundary effects of the laminar container. The results show that compared with the center accelerations of the soil, the maximum values of EPGA, NMSE and EF for the laminar beams can be 21.50%, 21.36% and 3.1%, respectively, with the dry sand model, indicating the shear efficiency of the laminar container. Under the same dynamic load conditions, the peak acceleration and the peak frequency of each laminar beam in the dry sand model are 2.37 and 2.23 times of those of the water model, indicating that the response of the laminar beams in the dry sand model is controlled by the response of the soil, which further verifies the excellent shear efficiency of the laminar container. The shear modulus and the damping ratio are similar between the laminar beams and the center of the soil in the dry sand model, with the relative differences of 3% and 18%, respectively; the shear modulus of laminar beams in the water model is 1/3 of that in the dry sand model, which is only 9.22 MPa; but the damping ratio is relatively large, which is 34.8%. Taking 5% of the acceleration peak error as the threshold of the boundary effect, the test results are valid and reliable in the range of about 90 cm×26 cm at the center of the laminar container. The proposed methods and conclusions should have important guiding significance and application value for evaluating the boundary effect of the laminar container of the hypergravity shaking table. |
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| Keywords: | hypergravity shaking table flexible laminar container boundary effect evaluation indexes verification methods |
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