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首页> 外文期刊>Soil Dynamics and Earthquake Engineering >Responses of caisson-piles foundations to long-term cyclic lateral load and scouring
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Responses of caisson-piles foundations to long-term cyclic lateral load and scouring

机译：沉箱桩基础对长期周期性侧向荷载和冲刷的响应

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摘要

The caisson-piles composite foundation is considered as a viable alternative to caisson foundations for the Qiongzhou Strait bridge. It can significantly reduce the caisson height by connecting the lower grouped piles to the upper caisson and improve its mechanical behaviour under lateral loading. A series of model tests are conducted at 1 g to investigate the cyclic responses as well as the coupled cyclic and scouring responses of the caisson-piles composite foundation under 10,000 cycles. The cyclic responses of the caisson-4 piles composite foundation are compared with those of a conventional caisson, including various cyclic load characteristics, i.e., one-way, asymmetric two-way and symmetric two-way cyclic loading. Two scour depths and two cyclic load amplitudes for the one-way cyclic loading are applied in the coupled tests. A framework to predict the accumulated deformation of the caisson-piles composite foundation due to cyclic loading and scouring is developed. It is found that the accumulated residual displacements or rotations are dependent on the applied cyclic load characteristic and scour depth, and the most onerous loading condition is between one-way and symmetric two-way loading. The effect of scouring can be rationally assessed using a modified cyclic load level, replacing the static capacity by the post-scour static capacity.
机译：沉箱桩基础被认为是琼州海峡大桥沉箱基础的可行替代方案。通过将下部组合桩连接到上部沉箱，可以显着降低沉箱高度，并改善其在侧向荷载作用下的力学性能。在1 g下进行了一系列模型测试，以研究沉箱-桩复合地基在10,000次循环下的循环响应以及耦合的循环响应和冲刷响应。将沉箱4桩复合地基的循环响应与常规沉箱的循环响应进行比较，包括各种循环载荷特性，即单向，非对称双向和对称双向循环载荷。在耦合测试中应用了单向循环载荷的两个冲刷深度和两个循环载荷振幅。建立了一个框架来预测沉箱-桩复合地基由于循环荷载和冲刷而产生的累积变形。发现累积的残余位移或旋转取决于所施加的循环载荷特性和冲刷深度，并且最繁重的载荷条件在单向载荷和对称双向载荷之间。可以使用修改后的循环负载水平合理地评估冲刷的效果，用冲刷后的静态容量代替静态容量。

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  • 来源
    《Soil Dynamics and Earthquake Engineering》 |2019年第4期|62-74|共13页
  • 作者

    Zhang Chenrong; Zhang Xun; Huang Maosong; Tang Huawei;

  • 作者单位

    Tongji Univ, Dept Geotech Engn, 1239 Siping Rd, Shanghai 200092, Peoples R China|Tongji Univ, Minist Educ, Key Lab Geotech & Underground Engn, 1239 Siping Rd, Shanghai 200092, Peoples R China;

    Changan Univ, Sch Civil Engn, Xian 710061, Shanxi, Peoples R China;

    Tongji Univ, Dept Geotech Engn, 1239 Siping Rd, Shanghai 200092, Peoples R China|Tongji Univ, Minist Educ, Key Lab Geotech & Underground Engn, 1239 Siping Rd, Shanghai 200092, Peoples R China;

    Tongji Univ, Dept Geotech Engn, 1239 Siping Rd, Shanghai 200092, Peoples R China|Tongji Univ, Minist Educ, Key Lab Geotech & Underground Engn, 1239 Siping Rd, Shanghai 200092, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Caisson-piles composite foundation; Model test; Cyclic load; Scouring;

    机译：沉箱桩基础;模型试验;循环荷载;冲刷;

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