| 雄安新区现今地应力环境及其对构造稳定性影响研究 |
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| 关键词:Xiongan New Area hydrofracturing crustal stress measuring in-situ stress real-time monitoring Coulomb friction criteria Byerlee’s law tectonic stability |
| 基金项目:中国地质调查局项目“京津冀协同发展区活动构造与区域地壳稳定性调查”(编号: DD20160267);“通州-石家庄活动构造带区域地质调查项目”(编号: DD20190317);国家自然科学基金项目“断裂活动导致地应力解耦的机理研究”(编号: 41702341) |
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| A Study of Current In-situ Stress State and Its Influence on Tectonic Stability in the Xiongan New Area |
| The development of the Xiongan New Area is a “strategy crucial for the next millennium”, which is of great significance for the national strategy to ascertain the current in-situ stress state of the Xiongan New Area and its neighboring areas as well as to assess its local tectonic stability. To this end, the authors first comprehensively considered the tectonic geological background and rock mass conditions of this area and its neighboring areas, then gathered data from 16 in-situ stress sensors installed at varying intervals along the total depth of 620 m borehole located inside a Yanshanian granite-rich region at the key structural part of Shunping County and conducted real-time monitoring of in-situ stress with the method of piezomagnetic electric induction. The in-situ stress data reveal that the maximum horizontal principal stress (SH) is 13.23~29.42 MPa and the minimum horizontal principal stress (Sh) is 9.28~19.73 MPa. The relationship between the three principal stresses is in order of SH>Sh>SV. The maximum horizontal principal stress direction is NW20°. With the introducing the stress accumulation coefficient (μm) and the friction coefficient of the fault (μ), the authors calculated the critical failure state of the three main buried faults in the Xiongan New Area: Baoding–Shijiazhuang, Niudong and Xushui–Dacheng. According to Coulomb friction criteria and Byerlee law, the authors investigated the fault activity hazards, and the result shows that, under the current in-situ stress condition, the three main buried faults will not lose stability, but the level of regional stress accumulation is a little higher than medium, it is recommended to strengthen the monitoring of relative magnitude of in-situ stress in a long-term and analyze the dynamic evolution process of the three faults’ stability. |
| FAN Yu-lu,TAN Cheng-xuan,ZHANG Peng,SUN Ming-qian,QI Bang-shen,FENG Cheng-jun,MENG Jing,WANG Hui-qing.2020.A Study of Current In-situ Stress State and Its Influence on Tectonic Stability in the Xiongan New Area[J].Acta Geoscientica Sinica,41(4):481-491. |
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