岩土力学 ›› 2024, Vol. 45 ›› Issue (8): 2324-2337.doi: 10.16285/j.rsm.2023.1379

• 基础理论与实验研究 • 上一篇    下一篇

基于振动台试验的不同含石率土-石混合体边坡地震动响应差异性研究

谢周州1，赵炼恒1, 2, 3，李亮1，黄栋梁1，张子健1，周靖4   

  1. 1. 中南大学 土木工程学院，湖南 长沙 410075；2. 中南大学 重载铁路工程结构教育部重点实验室，湖南 长沙 410075； 3. 中南大学 轨道交通工程结构防灾减灾湖南省重点实验室，湖南 长沙 410075； 4. 华南理工大学 亚热带建筑与城市科学全国重点实验室，广东 广州 510640
  • 收稿日期:2023-09-13 接受日期:2024-01-04 出版日期:2024-08-10 发布日期:2024-08-12
  • 通讯作者: 赵炼恒，男，1980年生，博士，教授，博士生导师，主要从事道路与铁道工程、交通岩土工程方面的研究。E-mail: 210011@csu.edu.cn
  • 作者简介:谢周州，男，1996年生，博士研究生，主要从事地质灾害防治方面的研究工作。E-mail: zhouzhouxie@csu.edu.cn
  • 基金资助:
    国家自然科学基金面上项目（No. 51878668，No. 52378512）；湖南省杰出青年科学基金（No. 2021JJ10063）；中国国家留学基金（No. 202106370143，No. 202406370243）。

Difference of dynamic responses of soil-rock mixture slopes with different rock contents based on shaking table test

XIE Zhou-zhou1, ZHAO Lian-heng1, 2, 3, LI Liang1, HUANG Dong-liang1, ZHANG Zi-jian1, ZHOU Jing4   

  1. 1. School of Civil Engineering, Central South University, Changsha, Hunan 410075, China; 2. MOE Key Laboratory of Engineering Structures of Heavy Haul Railway, Central South University, Changsha, Hunan 410075, China; 3. Hunan Provincial Key Laboratory for Disaster Prevention and Mitigation of Rail Transit Engineering Structure, Central South University, Changsha, Hunan 410075, China; 4. State Key Laboratory of Subtropical Building and Urban Science, South China University of Technology, Guangzhou, Guangdong 510640, China
  • Received:2023-09-13 Accepted:2024-01-04 Online:2024-08-10 Published:2024-08-12
  • Supported by:
    This work was supported by the General Program of National Natural Science Foundation of China(51878668, 52378512), the Hunan Province Science Fund for Distinguished Young Scholars (2021JJ10063) and the Chinese Scholarship Council (202106370143, 202406370243).

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摘要： 针对土-石混合体边坡动力响应特性尚不明确的问题，基于相似原理设计开展了3组不同含石率土-石混合体边坡大型振动台试验，系统地对比分析了不同含石率土-石混合体边坡动力响应的差异。研究结果表明：土-石混合体边坡在地震作用下的加速度响应符合自由面效应，即边坡在近坡顶端处的加速度放大效应要明显强于坡体内，而不同含石率土-石混合体边坡在不同频率正弦波激振作用下的动力响应差异明显，这是因为不同含石率土-石混合体边坡结构的动力特性存在差异；地震作用下，模型边坡动土压力由边坡浅表层至坡体内部呈不断增大趋势，但由于坡体变形与损伤程度不同，不同含石率边坡整体的动土压力响应程度不同；且在地震波分级加载过程中，边坡不同部位处动土压力的突变可作为边坡产生动力破坏的依据；随着含石率的上升，地震作用下边坡整体的变形程度逐渐降低：20%含石率边坡表现为由浅层至深层的连续滑动，而40%与60%含石率的边坡变形则相对较小，40%含石率边坡仅表层岩土体发生滑移，60%含石率边坡仅浅表层土体发生剥落，含石率的提升对土-石混合体边坡起到了加固作用。

关键词: 地震滑坡, 振动台试验, 边坡工程, 土-石混合体, 动力响应

Abstract: To address the limited comprehension of the dynamic response characteristics of soil-rock mixture (SRM) slopes, three sets of large-scale shaking table model tests of SRM slope with different rock contents were designed and conducted based on the similarity principle. The differences in dynamic response of SRM slope with different rock contents were systematically compared and analyzed. The research results indicate that the acceleration response of SRM slopes under earthquake action conforms to the free surface effect, that is, the acceleration amplification effect of the slope is significantly stronger near the top of the slope than within the slope. However, the dynamic response of SRM slopes with different rock contents under sine wave excitation of different frequencies is significantly different, this is due to the differences in the dynamic properties of slope structures with different rock contents. Under seismic action, the dynamic earth pressure of SRM slopes with different rock contents increases continuously from the shallow surface to the interior of the slope, but due to the different degrees of deformation and damage of the slope body, the overall dynamic soil pressure response of slopes with different rock contents is different. Moreover, during the entire seismic wave grading loading process, the sudden changes in dynamic soil pressure at different parts of the slope can serve as the basis for dynamic failure of the slope. As the rock content rises, the overall deformation of the slope under seismic action decreases gradually. For instance, a slope with 20% rock content exhibits continuous sliding from shallow to deep layers, while slopes with 40% and 60% rock content have relatively small deformation. A slope with 40% rock content only experience sliding of surface rock and soil, and a slope with 60% rock content only experience peeling of shallow surface soil. This indicates that higher rock content reinforces the stability of the SRM slopes.

Key words: earthquake-induced landslide, shaking table test, slope engineering, soil-rock mixture, dynamic response

中图分类号: TU 42
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