岩土力学 ›› 2023, Vol. 44 ›› Issue (4): 965-974.doi: 10.16285/j.rsm.2021.2052

• 基础理论与实验研究 • 上一篇    下一篇

土石混合体−基岩界面剪切力学特性块石尺寸效应

杨忠平1, 2, 3,李进1, 2, 3,刘浩宇1, 2, 3,张益铭1, 2, 3,刘新荣1, 2, 3   

  1. 1. 重庆大学 土木工程学院,重庆 400045;2. 重庆大学 山地城镇建设与新技术教育部重点实验室,重庆 400045; 3. 重庆大学 库区环境地质灾害防治国家地方联合工程研究中心(重庆),重庆 400045
  • 收稿日期:2021-12-19 接受日期:2022-07-01 出版日期:2023-04-18 发布日期:2023-04-27
  • 作者简介:杨忠平,男,1981年生,博士,教授,博士生导师,主要从事环境岩土与边坡稳定性方面的教学与研究工作。
  • 基金资助:
    重庆市自然科学基金面上项目(No.cstc2021jcyj-msxmX0558);国家重点研发计划项目(No.2021YFB3901402)。

Influence of the block stone size on shear mechanical behavior of soil-rock mixture-bedrock interface

YANG Zhong-ping1, 2, 3, LI Jin1, 2, 3, LIU Hao-yu1, 2, 3, ZHANG Yi-ming1, 2, 3, LIU Xin-rong1, 2, 3   

  1. 1. School of Civil Engineering, Chongqing University, Chongqing 400045, China; 2. Key Laboratory of New Technology for Construction of Cities in Mountain Area of Ministry of Education, Chongqing University, Chongqing 400045, China; 3. National Joint Engineering Research Center for Prevention and Control of Environmental Geological Hazards in the TGR Area (Chongqing), Chongqing University, Chongqing 400045, China
  • Received:2021-12-19 Accepted:2022-07-01 Online:2023-04-18 Published:2023-04-27
  • Supported by:
    This work was supported by the General Program of Chongqing Natural Science Foundation (cstc2021jcyj-msxmX0558) and the National Key Research and Development Program (2021YFB3901402).

摘要:

土石混合体−基岩界面的抗剪强度是控制坡体稳定性的重要参数之一,是工程设计的重要参数。为探究块石尺寸对土石混合体−基岩界面剪切力学特性的影响,开展了含不同块石尺寸的土石混合体−基岩界面室内大型剪切试验。结果表明:接触界面的破坏模式受块石尺寸和法向压力的影响不显著,均表现为应变硬化特征;法向压力会削弱块石尺寸效应的影响;随块石尺寸增加,抗剪强度和抗剪强度指标(φ)先增加后减少,既存在着正尺寸效应,又存在着负尺寸效应,尺寸效应对内摩擦角φ 的影响有限,整体在29º波动,而对表观黏聚力影响较大;不同块石尺寸试样在不同法向压力作用下均表现出了明显的剪缩行为,法向压力能够增强土石混合体的剪缩特性;土石混合体−基岩界面为薄弱的潜在滑移面,随着块石尺寸系数的增加,薄弱破坏面有向土石混合体内部转化的趋势。

关键词: 接触界面, 尺寸效应, 土石混合体, 剪切力学特性

Abstract: The shear strength of the soil-rock mixture-bedrock interface is a key parameter for the stability of the slope and engineering design. In order to explore the influence of the block stone size on the shear mechanical behavior of the soil-rock mixture-bedrock interface, a series of large-scale laboratory shear tests of the soil-rock mixture-bedrock interface with different block stone sizes was carried out. The results show that the failure mode of the contact interface is not significantly affected by the size of the block stone and the normal pressure, and both are characterized by strain hardening. However, the normal pressure will weaken the impact of the block stone size effect. As the size of the block stone increases, the shear strength and the shear strength index (φ, c) first increased and then decreased. There are both a positive size effect and a negative size effect. The size effect has a limited influence on the angle of internal friction φ , which fluctuates around 29º. However, the size effect has a significant influence on the apparent cohesion c. The specimens with different block sizes show obvious shear contraction behavior under different normal pressures, and the normal pressure can enhance the shear contraction characteristics of the soil-rock mixture. The soil-rock mixture-bedrock interface is a weak potential slip surface. With the increase of the block size coefficient, the weak failure surface tends to transform into the soil-rock mixture.

Key words: contact interface, size effect, soil-rock mixture, shear mechanical behavior

中图分类号: TU452
[1] 侯克鹏, 江帆, 张超, 龚晶汉, . 土石混合体−基岩接触面剪切的基覆面形态效应[J]. 岩土力学, 2025, 46(S1): 271-284.
[2] 张佩, 杨承儒, 侯世伟, 杜修力, . 基于内聚力单元的土石混合体细观数值方法[J]. 岩土力学, 2025, 46(5): 1620-1631.
[3] 杨立. 平板载荷试验数值分析及承载力判定标准研究[J]. 岩土力学, 2024, 45(S1): 723-730.
[4] 程家林, 张贵科, 邓韶辉, 黄习文, 周伟, 马刚, . 干湿循环对不同粒径堆石颗粒破碎强度的影响研究[J]. 岩土力学, 2024, 45(S1): 95-105.
[5] 尹敬涵, 盛谦, 崔臻, 张茂础, . 基于多尺寸结构面的循环剪切力学特性及其抗剪强度研究[J]. 岩土力学, 2024, 45(S1): 405-414.
[6] 朱晶, 裴强强, 郭青林, 张博, . 基于尺寸效应的夯土水盐运移分布特征研究[J]. 岩土力学, 2024, 45(5): 1481-1494.
[7] 闫世豪, 迟世春, 王晋伟, 郭宇, 周新杰, . 考虑微裂纹随机分布的堆石颗粒准静态强度统计模型[J]. 岩土力学, 2024, 45(5): 1378-1387.
[8] 陈丁, 黄文雄, 黄丹. 光滑粒子法中的摩擦接触算法及其在含界面土体变形问题中的应用[J]. 岩土力学, 2024, 45(3): 885-894.
[9] 黄锋, 米吉龙, 杨永浩, 董广法, 张班, 刘星辰, . 分级动荷载下土石混合体滞回曲线形态特征试验研究[J]. 岩土力学, 2024, 45(3): 674-684.
[10] 罗国立, 张科, 齐飞飞, 朱辉, 张凯, 刘享华, . 基于3D打印的裂隙岩体力学特性尺寸效应及各向异性初探[J]. 岩土力学, 2023, 44(S1): 107-116.
[11] 齐添, 孔剑捷, 刘飞禹. 循环剪切对格栅−土石混合体界面特性的影响[J]. 岩土力学, 2023, 44(9): 2593-2602.
[12] 周航, 吴晗, 曾少华, . 基于应变梯度理论的砂土中扩孔闭合解[J]. 岩土力学, 2023, 44(3): 757-770.
[13] 毛彦军, 陈曦, 范超男, 葛少成, 李文璞, . 基于CT三维重建的注水煤岩体裂隙扩展规律研究[J]. 岩土力学, 2022, 43(6): 1717-1726.
[14] 徐华, 周廷宇, 王歆宇, 张杰, 张小波, 刘雨辰, . 川藏铁路红层改良路基填料压缩试验 与颗粒流模拟研究[J]. 岩土力学, 2021, 42(8): 2259-2268.
[15] 鲁洋, 刘斯宏, 张勇敢, 杨蒙. 黏质土石混合体渗透特性试验及演化机制探讨[J]. 岩土力学, 2021, 42(6): 1540-1548.
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
No Suggested Reading articles found!