| 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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| 引用本文：范玉璐,谭成轩,张鹏,孙明乾,戚帮申,丰成君,孟静,王惠卿.2020.雄安新区现今地应力环境及其对构造稳定性影响研究[J].地球学报,41(4):481-491. |
| DOI：10.3975/cagsb.2020.040603 |
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| 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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| 中文摘要:雄安新区是一项“千年大计”的国家战略, 查明雄安新区及邻区现今地应力环境, 评价其构造稳定的动力背景, 对保障新区的规划、建设和未来安全具有重要的意义。为此, 综合考虑雄安新区及其外围区域构造地质背景、岩体条件等, 在雄安新区外围顺平县关键构造部位燕山期隐伏花岗岩中开展620 m深孔水压致裂地应力测量和压磁电感法地应力实时监测。结果表明: 在测量深度范围内, 最大水平主应力(SH)大小为13.23~29.42 MPa, 最小水平主应力(Sh)大小为9.28~19.73 MPa; 三个主应力大小关系为SH＞Sh＞SV; 最大水平主应力方向为NW20°。引入应力积累系数(μm)、断层摩擦系数(μ), 依据库伦断层滑动失稳摩擦准则和Byerlee定律对保定—石家庄、牛东和徐水—大城三条主要隐伏断裂的稳定性进行计算分析, 结果显示: 在目前地应力条件下, 雄安新区三条主要隐伏断裂不会滑动失稳、构造是稳定的, 但地壳浅表层应力积累水平中等偏高, 建议加强长期地应力实时监测, 分析其稳定性的动态演化过程。 |
| 中文关键词:雄安新区 水压致裂法地应力测量 地应力实时监测 库伦断层滑动失稳摩擦准则 Byerlee定律 构造稳定性 |
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| A Study of Current In-situ Stress State and Its Influence on Tectonic Stability in the Xiongan New Area |
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| Abstract: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. |
| keywords:Xiongan New Area hydrofracturing crustal stress measuring in-situ stress real-time monitoring Coulomb friction criteria Byerlee’s law tectonic stability |
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