两种典型桩板墙地震响应特性的对比分析
发布时间：2018-12-11 15:57
【摘要】：土工结构的震害调查表明,桩板墙具备优良的抗震性能,安装锚索之后效果更佳。尽管如此,目前关于桩板墙的研究大多数集中于静力方面,对于动力响应情况和抗震工作机制的研究较少,关于两类典型桩板墙,即桩板墙和锚索桩板墙的地震响应特性的对比研究未见报道。基于此,将桩板墙和锚索桩板墙进行了同台的大型振动台模型试验,对比分析了两种结构的地震响应特性。试验结果表明:两种结构的土压力、锚索拉力和桩身位移地震时程响应规律均与输入的地震动参数密切相关,如曲线形状和变化趋势,并且它们的峰值出现时刻与地震动加速度峰值出现时刻基本一致。锚索的安装,能更好地保持边坡的稳定性和有效限制桩身变形,尤其是在高地震烈度区,当土体非线性增强时,优势体现愈发明显,即预应力锚索会产生减小桩身位移的效果,特别是当地震系数为0.4时,普通桩板墙的位移达到预应力锚索桩板墙的2.4倍。此外,锚索拉力的施加,能够使桩对土体产生"主动"的反压力,两种结构在静力和地震系数为0.1的工况下桩背所受的滑坡推力基本一致,嵌固段土体抗力的差距也不明显,实测点强度的最大差异不超过20%,说明锚索的作用没有得到充分发挥;但当地震系数大于等于0.2后,锚索作用开始体现,桩土变形的协调性更好,桩背与滑体的相互作用力增大,土体抗力较桩板墙大幅度减小,更有利于边坡的稳定。同时,锚索拉力的作用使结构的悬臂段桩身内力较大,在进行结构设计时,相比于普通桩板墙,锚索桩板墙应加强悬臂段,可以适当弱化嵌固段。分析成果可供高烈度地震区桩板墙的抗震设计、灾后恢复重建及今后相关规范修订参考。
[Abstract]:The seismic damage investigation of geotechnical structure shows that the pile-slab wall has good seismic performance, and the effect is better after the anchor cable is installed. However, at present, most of the researches on pile-slab wall are focused on static force, but there are few researches on dynamic response and seismic mechanism, about two kinds of typical pile-slab wall, There is no report on the seismic response characteristics of pile-slab wall and cable-anchored pile-slab wall. Based on this, the large shaking table model tests of pile plate wall and anchor cable pile plate wall are carried out, and the seismic response characteristics of the two structures are compared and analyzed. The experimental results show that the earth pressure, cable tension and displacement of pile are closely related to the input parameters of ground motion, such as curve shape and variation trend. And their peak appearance time is basically consistent with the peak time of ground motion acceleration. The installation of anchor cable can better maintain the stability of slope and effectively limit the deformation of pile body, especially in the area of high seismic intensity, when the soil is nonlinear, the superiority is more obvious, that is, the prestressed anchor cable will produce the effect of reducing the displacement of pile body. Especially when the seismic coefficient is 0.4, the displacement of common pile-slab wall is 2.4 times of that of prestressed anchor cable pile-slab wall. In addition, the application of anchor cable force can cause the pile to produce "active" back pressure on soil, and the landslide thrust of the two structures is basically the same under the condition of static force and earthquake coefficient of 0.1. The difference of soil resistance is not obvious, the maximum difference of measured point strength is not more than 20, which shows that the role of anchor cable has not been given full play. However, when the seismic coefficient is greater than 0.2, the effect of anchor cable begins to manifest, the deformation of pile and soil is more harmonious, the interaction force between pile back and sliding body increases, and the soil resistance is greatly reduced than that of pile and slab wall, which is more favorable to the stability of slope. At the same time, the effect of cable tension makes the internal force of the cantilever of the structure larger. In the design of the structure, compared with the ordinary pile-plate wall, the anchor-cable pile-plate wall should strengthen the cantilever segment and weaken the fixed segment properly. The results can be used as reference for seismic design, post-disaster recovery and reconstruction of pile-slab wall in high intensity earthquake area and revision of relevant codes in the future.
【作者单位】： 西南石油大学地球科学与技术学院;西南交通大学土木工程学院;
【基金】：国家自然科学基金项目(No.41602332) 安全生产重大事故防治关键技术科技项目(No.2014_3189) 四川省教育厅项目(No.14ZB0056)~~
【分类号】：TU435
本文编号：2372818
[Abstract]:The seismic damage investigation of geotechnical structure shows that the pile-slab wall has good seismic performance, and the effect is better after the anchor cable is installed. However, at present, most of the researches on pile-slab wall are focused on static force, but there are few researches on dynamic response and seismic mechanism, about two kinds of typical pile-slab wall, There is no report on the seismic response characteristics of pile-slab wall and cable-anchored pile-slab wall. Based on this, the large shaking table model tests of pile plate wall and anchor cable pile plate wall are carried out, and the seismic response characteristics of the two structures are compared and analyzed. The experimental results show that the earth pressure, cable tension and displacement of pile are closely related to the input parameters of ground motion, such as curve shape and variation trend. And their peak appearance time is basically consistent with the peak time of ground motion acceleration. The installation of anchor cable can better maintain the stability of slope and effectively limit the deformation of pile body, especially in the area of high seismic intensity, when the soil is nonlinear, the superiority is more obvious, that is, the prestressed anchor cable will produce the effect of reducing the displacement of pile body. Especially when the seismic coefficient is 0.4, the displacement of common pile-slab wall is 2.4 times of that of prestressed anchor cable pile-slab wall. In addition, the application of anchor cable force can cause the pile to produce "active" back pressure on soil, and the landslide thrust of the two structures is basically the same under the condition of static force and earthquake coefficient of 0.1. The difference of soil resistance is not obvious, the maximum difference of measured point strength is not more than 20, which shows that the role of anchor cable has not been given full play. However, when the seismic coefficient is greater than 0.2, the effect of anchor cable begins to manifest, the deformation of pile and soil is more harmonious, the interaction force between pile back and sliding body increases, and the soil resistance is greatly reduced than that of pile and slab wall, which is more favorable to the stability of slope. At the same time, the effect of cable tension makes the internal force of the cantilever of the structure larger. In the design of the structure, compared with the ordinary pile-plate wall, the anchor-cable pile-plate wall should strengthen the cantilever segment and weaken the fixed segment properly. The results can be used as reference for seismic design, post-disaster recovery and reconstruction of pile-slab wall in high intensity earthquake area and revision of relevant codes in the future.
【作者单位】： 西南石油大学地球科学与技术学院;西南交通大学土木工程学院;
【基金】：国家自然科学基金项目(No.41602332) 安全生产重大事故防治关键技术科技项目(No.2014_3189) 四川省教育厅项目(No.14ZB0056)~~
【分类号】：TU435
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1 雷丹;谢健鹤;;桩板墙在万州某滑坡体整治工程中的应用[J];路基工程;2014年03期
2 ;[J];;年期
，本文编号：2372818
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