小浪底北岸灌区某隧洞 F29断层承压水涌水数值模拟分析

摘要

On the North Bank of the Xiaolangdi Dam irrigation tunnel F 29 fault high pressure water gushing ,water inflow in the tunnel excavation process by three-dimensional numerical simulation method under various operating conditions , water content and the possibility of prediction and analysis of different treatment scheme comparison ,the paper puts for-ward reasonable treatment of fault F 29 high confined water .Analysis results show that don ’t take impermeable fault water inrush quantity measures of treatment effect than the fault zone water inflow significantly ,but would have been almost im-possible to mud gushing phenomenon .The tunnel ahead of high-pressure grouting anti-seepage measures can effectively reduce the tunnel water inflow ,within the sphere of influence of the same width ,the size of the area of impervious directly affects the size of inflow ,grouting section more ,inflow of smaller and smaller .The numerical analysis results of pressure tunnel provide important reference for confined water treatment , but also provide a reference for the similar engineering geological conditions .%针对小浪底北岸灌区某隧洞F29断层高位承压水涌水问题，采用三维数值模拟法研究多种工况条件下隧洞开挖过程的涌水量，进行涌水量和可能性预测及不同处理方案对比分析，提出合理的F29断层高位承压水处理方案建议。分析结果表明，不采取防渗处理措施情况下断层涌水量比断层影响带涌水量显著，但基本不可能发生突泥现象；采用隧洞内超前高压注浆防渗措施能有效减少隧洞的涌水量，在同一宽度的影响范围内，防渗截面面积的大小直接影响到涌水量的大小，灌浆截面越大，涌水量越小。数值分析成果为隧洞承压水处理提供重要参考依据，也为地质环境条件类似的工程提供借鉴。