煤炭工程 ›› 2025, Vol. 57 ›› Issue (10): 123-131.doi: 10. 11799/ ce202510015

• 研究探讨 • 上一篇    下一篇

鄂尔多斯盆地白垩系竖井建设现状与地质挑战

范文博,赵晓东,冯旭海,生帅,焦威,周国庆,赵光思   

  1. 1. 中煤建设集团有限公司,北京 102218

    2. 中国矿业大学深地工程智能建造与健康运维全国重点实验室,江苏 徐州 221116

    3. 中国中煤能源集团有限公司,北京 100120

    4. 中煤西安设计工程有限责任公司,陕西 西安 710000

  • 收稿日期:2025-05-26 修回日期:2025-07-26 出版日期:2025-10-10 发布日期:2025-11-12
  • 通讯作者: 赵晓东 E-mail:zxdcumt@126.com

Current Situation and Geological Challenges of Shaft sinking in Cretaceous Strata of the Ordos Basin

  • Received:2025-05-26 Revised:2025-07-26 Online:2025-10-10 Published:2025-11-12
  • Contact: Xiaodong XiaodongZhao E-mail:zxdcumt@126.com

摘要:

鄂尔多斯盆地白垩系具有强富水、含泥质、弱胶结等特征,具有显著的工程环境效应,给盆地竖井施工带来显著的地质挑战。通过总结调研鄂尔多斯盆地竖井施工过程中的问题发现:盆地白垩系地层中冻结壁厚度与井筒最大荒径比最大相差50%以上;竖井井筒实际揭露涌水量与预测涌水量相差大,冻结、注浆、掘砌等施工参数难以把握;盆地竖井建设呈现出普通法无法通过,注浆法收效甚微,冻结法存在风险的尴尬局面。受燕山期和喜山期两期构造应力作用和地层非均质影响,鄂尔多斯盆地内部发育两组区域性构造裂缝;盆地周围构造应力表现为先期不均匀挤压和后期不对称剪切(扭转)作用,使得盆地内部构造裂缝具有压扭特征;竖井围岩构造裂缝不同于宏观断层和微尺度裂纹,其具有和竖井井筒直径相同的尺度量级,导致水-岩-缝-井间的强非线性耦合规律,严重时诱发井壁破裂甚至淹井。研制压扭裂缝CT可视化实验系统和强富水、含泥质、弱胶结砂岩重塑制备方法,揭示压扭裂缝形成特征和受扰演化致灾机理,建立原位精细监测方法,将为建立基于水-岩-缝-井耦合作用的井壁荷载模型,创新发展竖井井壁防灾理论体系,克服西部竖井建设、运维面临的地质挑战提供科学依据。

关键词:

鄂尔多斯盆地 , 白垩系砂岩 , 构造裂缝 , 冻结法凿井

Abstract:

The Cretaceous system in the Ordos Basin exhibits characteristics such as high-water content, clay-bearing layers, and weak cementation, which have significant engineering and environmental effects, posing notable geological challenges for shaft construction. An analysis of the issues encountered during shaft sinking in Ordos Basin reveals that the ratio between frozen wall thickness and maximum shaft radius in Cretaceous strata often deviates by more than 50%. There is also a notable discrepancy between actual water inflow observed during excavation and the predicted amounts, complicating the control of key sinking parameters such as freezing, grouting, and open excavation. Traditional methods were proving inadequate, grouting was ineffective, and freezing methods carried significant risks. The challenges in shaft sinking are exacerbated by tectonic stress from the Yanshanian and Himalayan orogenic periods, which, combined with the heterogeneity of the strata, have led to the development of two major sets of regional structural fractures. These fractures exhibit early-stage uneven compression followed by asymmetric shearing, giving rise to compressive torsion characteristics. These structural fractures, located in the surrounding strata of the shafts, differ from larger faults and microcracks. Their scale, comparable to the diameter of the shafts, leads to complex, nonlinear interactions between groundwater, sandstone, fractures, and the shafts. These interactions can result in severe consequences, such as lining failure and shaft flooding. To address these issues, a compressive torsion fracture CT visualization system and a method for preparing water-rich, clay-bearing, weakly cemented sandstone have been developed. The goal is to reveal the characteristics, formation processes, and evolution of compressive torsion fractures, as well as the mechanisms of disaster caused by disturbances to these fractures. These researches will help establish precise, in-situ monitoring methods and lead to the development of a lining load model that accounts for the coupled effects of groundwater, sandstone, fractures, and shafts. Ultimately, it will support the innovative development of disaster prevention theories for shaft linings and provide the scientific basis needed to solve the geological challenges hindering shaft construction and operation in Western China.

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