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| 采动条件下井壁变形对井筒涌水量的影响 |
| Impact of wellbore deformation on inflow under boring conditions |
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| DOI： |
| 中文关键词: 采动条件 井壁变形 井筒涌水量 破坏带 数值模拟 |
| 英文关键词: mining conditions borehole deformation wellbore inflow deformation belt numerical simulation |
| 基金项目:河北省自然科学基金资助项目（E2013508123）；教育部新世纪优秀人才支持计划（NCET-11-0838）；“十二五”国家科技支撑计划实施方案（2012BAK04B04）；国家自然科学基金资助项目（41072188） |
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| 中文摘要: |
| 大口径深立井开挖过程中，较准确预测井筒涌水量一直是工程实践中需要解决的难题.以山东龙固矿主井为例，采用理论分析、实验测试和数学计算探讨井筒开挖阶段涌水量的合理预测方法.首先，开展了实验测试分析应力应变-渗透性的关系，提出了覆岩的渗透性与岩石性能有关，且渗透性在岩石破坏前后其值达到最大.其次，采用岩石力学理论和Flac3D数值模拟对井筒破坏带范围进行计算，得出风化基岩段产生2.5 m左右的破坏带，二叠系砂岩中产生5 m左右破坏带，在石炭系岩层中产生3 m左右的破坏带.最后，分别对是否考虑岩层破坏带影响的2种情况，使用解析法、数值模拟法、达西渗流断面法计算了井筒涌水量.得出结论：忽视井筒破坏带对涌水量的影响导致预测值偏小；达西渗流理论公式应用在上覆第四系松散层中应用效果较好，在深部基岩裂隙岩体中数值法效果更好. |
| 英文摘要: |
| To accurately forecast the inflow of water from shaft is always a problem needed to be solved in engineering practice, in the excavation process of deep and large diameter shaft. The reasonable prediction method was explored which of water inflow during the shaft excavation by theoretical analysis, experimental test and mathematical calculation, Longgu Coal Mine in Shandong was taken as an example. Firstly, the experimental test was carried out to analyze the relationship between stress-strain and permeability. The rock permeability was related to rock properties and it reached to the maximum before and after the rock damage by analyzing the result of experimental test. Secondly, the range of shaft damage zone was calculated by using the theory of rock mechanics and numerical simulation with Flac3D. The conclusions could be got from the calculation: the damage zone of weathered bedrock section was about 2.5 m, it was about 5 m in Permian sandstone and about 3 m in the Carboniferous strata. Finally, the analytical method, numerical simulation method and the Darcy seepage section method were used to calculate the water inflows from shaft, considering whether there was the influence of rock damage zone, respectively. So, the final conclusions were gotten, ignoring the shaft damage zone’s influence on water inflow will lead to the prediction value to become smaller. Applying the formula of Darcy percolation theory in the Quaternary overlying loose layer has better application effect, and the numerical method has much better effects in the deep bedrocks. |
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