理论与试验研究

冰石混合物和冻土石混合体在劈裂下的声发射特征

  • 胡峰 ,
  • 朱益军 ,
  • 吕庆 ,
  • 李志清 ,
  • 王双娇
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  • 1.浙江数智交院科技股份有限公司,杭州 310012;
    2.浙江大学 建筑工程学院,杭州 310058;
    3.中国科学院地质与地球物理研究所,北京 100029
胡峰(1991—),男,江西上饶人,博士,高级工程师,主要从事岩土材料力学性质及地质灾害防治等研究。E-mail:18810550150@163.com

收稿日期: 2024-03-11

  网络出版日期: 2025-01-03

基金资助

浙江省重点研发计划(2021KCKT2011);第二次青藏高原综合科学考察(2019QZKK0904);国家自然科学基金(42177146, 42277132);自然资源部浙江地质灾害野外观测开放基金(ZJDZGCZ-2021)

Acoustic Emission Characteristics of Ice-Rock Mixture and Frozen Soil-Rock Mixture under Splitting Test

  • Hu Feng ,
  • Zhu Yijun ,
  • Lü Qing ,
  • Li Zhiqing ,
  • Wang Shuangjiao
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  • 1. Zhejiang Institute of Communications Co., Ltd., Hangzhou 310012, P. R. China;
    2. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, P. R. China;
    3. Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, P. R. China

Received date: 2024-03-11

  Online published: 2025-01-03

摘要

对冻结岩土介质力学响应的研究是保障寒区土建工程安全及地质灾害防治的重点内容。论文通过对寒区建设中常见的冰、冰石混合物、冻土和冻土石混合体开展巴西劈裂加载下的声发射特征研究,分析了4种介质加载过程中的裂纹开裂模式、声发射能量演化和声发射b值特征。结果表明:(1)冰石混合物和冻土石混合体中的劈裂裂纹较冰和冻土曲折,存在绕石现象;(2)冰石混合物中冰石界面附近的裂纹多发育于靠近块石的冰中,且其强度和声发射能量明显大于纯冰试样;(3)冻土石混合体的裂纹主要由冻土裂纹和土石界面裂纹构成,该试验条件下冻土石界面仍然是最薄弱部位,导致冻土石混合体的声发射能量弱于冻土试样;(4)冰和冰石混合物劈裂加载的声发射能量峰值对应加载力峰值,呈现明显的单峰特征,冻土和冻土石混合体的声发射能量峰值较加载力峰值存在滞后现象,且存在多峰特征;(5)4种介质的声发射b值随加载力先上升后下降的变化而表现为先减小后增大的趋势,且冻土石混合体加载力峰后阶段的b值波动大于其他三者,反映出峰后阶段土石界面开裂与冻土开裂的交替扩展触发了不同能量的声发射活动。

本文引用格式

胡峰 , 朱益军 , 吕庆 , 李志清 , 王双娇 . 冰石混合物和冻土石混合体在劈裂下的声发射特征[J]. 地下空间与工程学报, 2024 , 20(6) : 1877 -1884 . DOI: 10.20174/j.JUSE.2024.06.13

Abstract

Research on frozen geotechnical material is focused on guaranteeing the security of civil engineering and preventing of geological hazards in cold regions. The acoustic emission (AE) tests of the ice, ice-rock mixture, frozen soil, and frozen soil-rock mixture samples were carried out under Brazilian splitting conditions. The characteristics of crack evolution, acoustic emission energy and, b-value were discussed. The results show that: (1) The cracks in the ice-rock mixture and frozen soil-rock mixture are more tortuous than those in ice and frozen soil. (2) The crack in the ice-rock mixture is mainly distributed inside the ice near the ice-rock interface. Moreover, the tensile strength and acoustic emission energy of the ice-rock mixture are larger than that of ice. (3) The crack of frozen soil-rock mixture is composed of frozen soil crack and soil-rock interface crack. The frozen soil-rock interface is the weakest part inside the frozen soil-rock mixture, which leads to the acoustic emission energy of the frozen soil-rock mixture is smaller than that of frozen soil. (4)The acoustic emission energy peak of ice and ice-rock mixture being consistent with the leading peak and shows an obvious single peak pattern. Nevertheless, in the case of frozen soil and frozen soil-rock mixture, the acoustic emission energy peak lags behind the loading peak and display a multi-peak feature. (5) The b-values of all the samples decrease with the increasing loading in the pre-peak region, and then show an increasing trend with the decreasing loading in the post-peak region. Furthermore, the amplitude of the b-value of frozen soil-rock mixture is larger than that of others. It can be postulated that the alternating crack growth of soil and interface cracks triggers the different acoustic emission energy.

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