1.中山大学地球科学与工程学院, 广东 珠海519082
2.广东省地质局湛江地质调查中心, 广东 湛江 524000
3.广东省地球物理勘查院, 广东 广州 510800
4.广东省地质过程与矿产资源探查重点实验室, 广东 珠海519082
5.南方海洋科学与工程广东省实验室(珠海),广东 珠海 519082
吕娟霞(1999年生),女;研究方向:岩石力学实验;E-mail:lvjx27@mail2.sysu.edu.cn
刘洁(1967年生),女;研究方向:多尺度计算地球动力学;E-mail:liujie86@ mail.sysu.edu.cn
收稿:2025-06-09,
修回:2025-07-15,
录用:2025-10-09,
网络首发:2026-01-04,
纸质出版:2026-03-25
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吕娟霞,罗强,李朋等.声发射及Kaiser效应揭示广东河源地区历史应力特征[J].中山大学学报(自然科学版)(中英文),2026,65(02):46-55.
LÜ Juanxia,LUO Qiang,LI Peng,et al.Historical stress characterization in Heyuan, Guangdong unveiled by acoustic emission and Kaiser effect[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2026,65(02):46-55.
吕娟霞,罗强,李朋等.声发射及Kaiser效应揭示广东河源地区历史应力特征[J].中山大学学报(自然科学版)(中英文),2026,65(02):46-55. DOI: 10.11714/acta.snus.ZR20250100.
LÜ Juanxia,LUO Qiang,LI Peng,et al.Historical stress characterization in Heyuan, Guangdong unveiled by acoustic emission and Kaiser effect[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2026,65(02):46-55. DOI: 10.11714/acta.snus.ZR20250100.
河源地区位于华南地块东缘,区内出露大面积花岗岩。为了解河源地区花岗岩所经历的应力历史,开展了不同加载方式的单轴压缩试验,根据声发射信息的Kaiser效应,分析河源地区花岗岩的应力特征。声发射结果显示,单轴压缩过程声发射大致分为平静期、快速增长期、突增期。分级加载过程声发射累积振铃呈现对应的台阶状升高,等幅循环加载过程有典型的Kaiser效应。利用G-P算法计算声发射振铃计数关联分形维数,将与近似Kaiser效应点邻近的振铃计数关联分形维数最小点,确定为最终Kaiser效应点,并利用循环加载数据的Felicity比值衡量Kaiser效应的有效程度;由此确定河源地区花岗岩最大历史应力为79.1 MPa。据此推测该花岗岩形成时的深度约为3.9~6.6 km,新生代以来河源地区的断块运动使得地表抬升约3.5~6.2 km。研究结果可为探讨华南地区构造演化提供全新佐证。
The Heyuan area is located on the eastern margin of the South China Block, where large granite outcrops are prominently exposed. To investigate the stress history of the granite in this region, a series of uniaxial compression tests were conducted. The stress characteristics of the granite were analyzed based on the Kaiser effect observed in acoustic emission (AE) signals. The AE results indicate that: 1) during monotonic uniaxial compression, the AE activity can be divided into three distinct phases: a low-activity phase, a rapid growth phase), and a burst phase; 2) in the case of incremental cyclic loading, the cumulative AE ringing counts exhibit a stepped increase; and 3) the constant-amplitude cyclic loading demonstrates a typical Kaiser effect. The G-P algorithm was employed to calculate the correlation dimension of AE ringing counts, characterizing the fractal scaling of damage evolution. The point with the minimum correlation dimension, located near the approximate Kaiser point, was identified as the critical stress point satisfying the Kaiser effect. Furthermore, the Felicity ratio derived from cyclic loading data was used to validate the Kaiser effect. Based on this analysis, the maximum historical differential stress of the granite in Heyuan was determined to be 79.1 MPa. It is inferred that the granite formed at a depth of approximately 3.9 to 6.6 km, and that block uplifts since the Cenozoic era have caused a surface rise by about 3.5 to 6.2 km in the Heyuan area. The result provides new evidence for the study of tectonic evolution in south China.
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