1.湖北第二师范学院建筑与材料工程学院,湖北 武汉 430000
2.西南交通大学土木工程学院,四川 成都 610031
3.海南大学土木建筑工程学院,海南 海口 570228
欧阳芳(1990—),女,讲师,博士。主要从事岩土工程抗震和地基处理方面的研究。E-mail: ouyangfang26@126.com
王志佳(1987—),男,讲师,博士。主要从事岩土地震工程方面的研究。E-mail: 993041@hainu.edu.cn
纸质出版:2021-10-15
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欧阳芳,周永毅,王志佳等.包裹碎石群桩动应力响应振动台模型试验研究∗[J].防灾减灾工程学报,2021,41(05):1062-1070.
Ouyang Fang,ZHOU Yongyi,WANG Zhijia,et al.Study on Dynamic Stress Responses of Geosynthetic Encased Stone Columns by Shaking Table Model Tests[J].Journal of Disaster Prevention and Mitigation Engineering,2021,41(05):1062-1070.
欧阳芳,周永毅,王志佳等.包裹碎石群桩动应力响应振动台模型试验研究∗[J].防灾减灾工程学报,2021,41(05):1062-1070. DOI: 10.13409/j.cnki.jdpme.201901008.
Ouyang Fang,ZHOU Yongyi,WANG Zhijia,et al.Study on Dynamic Stress Responses of Geosynthetic Encased Stone Columns by Shaking Table Model Tests[J].Journal of Disaster Prevention and Mitigation Engineering,2021,41(05):1062-1070. DOI: 10.13409/j.cnki.jdpme.201901008.
开展了包裹碎石群桩复合地基振动台模型试验,分析了包裹碎石桩轴向动应力及桩土之间水平剪切应力的响应特性。结果表明:地震波作用下,包裹碎石桩轴向动应力沿桩身向下迅速衰减。在地震作用过程中,包裹碎石桩上部承受的水平应力较大。某一地震作用下,取包裹碎石桩桩顶水平应力时程曲线的最大值,发现该值随输入地震加速度波峰值(0.1g~0.4g)的增大先增大,之后随输入加速度波峰值(0.6g、0.9g)的增大而减小,这表明桩顶的剪切强度降低了。
Shaking table model tests on the composite ground improved by geosynthetic encased stone columns were conducted, which were utilized to study the response characteristics of axial stress in geosynthetic encased stone columns and horizontal shear stress between soil and columns. The test results show that the axial dynamic stress of the geosynthetic encased stone column decreased rapidly along the column depth, and the horizontal stress in the upper part of the column was higher than the lower part under the action of an earthquake. The maximum horizontal stress on the geosynthetic encased stone column head was obtained from the time history curve, which increased with the input peak acceleration (0.1g~0.4g) firstly, and then decreased with the increase of the input peak acceleration (0.6g, 0.9g). Therefore, it can be drawn that the shear strength of the geosynthetic encased stone column head has decreased.
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