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岩体随钻表征技术及其在寒区的应用展望

Rock mass characterization using measurement while drilling and its application prospects in cold regions

  • 摘要: 寒区水冰相变与冻融损伤改变了岩体性质及钻头与岩体的相互作用, 使常温条件下建立的随钻表征模型面临适用性限制。本文梳理寒区岩体冻结与冻融劣化特征及现场监测方法, 归纳随钻测量装备、力学参数预测、结构识别与可钻性评价等方面的研究进展, 重点比较不同方法的假设条件、误差来源及寒区适用边界。分析认为: 岩体当前冻结状态与累积冻融损伤应分别表征, 孔隙冰胶结和裂隙冰支撑可能改变参数幅值及结构面响应, 钻进摩擦生热与局部融化则增加了响应解释的不确定性; 常规突变识别方法适于具有足够力学反差的宏观结构面, 难以直接逐条识别离散微裂隙, 冻融早期损伤宜转向钻进影响尺度内的统计表征; 机械参数应与振动、声学及温度信息联合分析, 并控制钻机工况与传感器温漂的影响。未来需通过受控冻融钻进试验、不同方向与跨钻孔对比及独立现场验证, 建立具有物理约束和不确定性表征的寒区随钻解释方法。

     

    Abstract: Water-ice phase transitions and freeze-thaw damage in cold regions alter rock mass properties and bit-rock interactions, limiting the applicability of measurement while drilling (MWD) models calibrated under normal-temperature conditions. This study reviews freezing and freeze-thaw deterioration characteristics of rock masses in cold regions and field monitoring methods, summarizes advances in MWD equipment, mechanical property prediction, structure identification, and drillability assessment, and compares the assumptions, error sources, and applicability limits of these approaches in cold regions. The analysis indicates that the current frozen state and accumulated freeze-thaw damage should be characterized separately. Pore-ice cementation and fracture-ice support may modify parameter magnitudes and interface responses, whereas drilling-induced frictional heating and local melting introduce additional uncertainty in response interpretation. Conventional abrupt-change detection methods are suitable for macroscopic structural planes with sufficient mechanical contrast but cannot be assumed to resolve individual dispersed microcracks. Early freeze-thaw damage should therefore be assessed statistically at the scale affected by drilling. Mechanical parameters should be combined with vibration, acoustic, and temperature information while accounting for operating conditions and sensor thermal drift. Future research should develop physically constrained MWD interpretation methods with quantified uncertainty for cold-region rock masses by conducting controlled freeze-thaw drilling experiments, comparisons across drilling directions and boreholes, and independent field validation.

     

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