含建筑桩基的顺层岩质边坡桩锚支护体系振动台模型试验
作者:
作者单位:

1.重庆大学 a.土木工程学院;2.b. 山地城镇建设与新技术教育部重点实验室;3.2.重庆电力高等专科学校 发展规划与质量保障处;4.3.中冶赛迪工程技术股份有限公司

作者简介:

通讯作者:

中图分类号:

TU473

基金项目:

国家重点研发计划(2018YFC1505501);重庆市住房和城乡建设委员会科研项目(2020-22)


Shaking table test of pile-anchor support system for bedding rock slope with building pile foundation
Author:
Affiliation:

1a. School of Civil Engineering;2.1b. Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University;3.2.Development Planning and Quality Assurance Division, Chongqing Electric Power College;4.3.CISDI Engineering Co., Ltd.

Fund Project:

National Key R&D Program of China (2018YFC1505501); Scientific Research Project of Chongqing Municipal Commission of Housing and Urban-rural Development (2020-22)

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    摘要:

    本文对具有建筑桩基的顺层岩质边坡桩锚支护体系开展了振动台模型试验,研究了预应力锚索、建筑桩基和边坡坡顶加速度的动力响应规律。结果表明,预应力锚索的应变在地震波加速度达到峰值时达到最大值,且上排锚索受力大于下排锚索,随着地震幅值的增大,最上排锚索锚固段率先发生滑移破坏失去锚固作用;建筑桩基应变最大值点位于滑动面以下一定深度,且远离边坡坡面的建筑桩基受力大于邻近边坡坡面的建筑桩基;坡顶各点峰值加速度随地震波幅值增大整体表现为线性增大,但在WenChuan-WoLong波(0.55g)和Sin波(0.4g)工况时,各点峰值加速度相对有所下降,随着地震波幅值增大,各点峰值加速度放大系数在汶川波和正弦波作用下并非单调变化,而是表现为先减小后增大波动变化特点。

    Abstract:

    A shaking table test is carried out for the bedding rock slope with building pile foundation. The seismic dynamic response of the system is studied mainly include prestressed anchor cable, the building pile foundation and the acceleration response of the slope. The results indicate that the strain of the anchor cable changes with the seismic wave, and the strain of the anchor cable reaches the maximum when the seismic wave reaches the peak, the upper cable force is larger than the lower. When the seismic amplitude increases, the upper anchor cable slips, and loses anchor effect. The maximum strain of building pile foundation is located at a certain depth below the sliding surface, and the stress of building pile foundation far away from the slope is greater than the one near the slope. The peak accelerations of slope top increase linearly with the seismic amplitude, but under the condition of WenChuan-WoLong wave (0.55g) amplitude and Sin wave (0.4g) amplitude, there is a decreasing tendency among the peak acceleration at each point. With the increase of seismic amplitude, the peak acceleration amplification coefficient of each point under Wenchuan and Sin earthquake does not change monotonously, but decreases first, and then increases.

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  • 收稿日期:2021-10-28
  • 最后修改日期:2022-05-15
  • 录用日期:2022-05-19
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