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鉴于地下水丰富且地质条件复杂洞段采用超前灌浆技术是解决涌水突砂和加固围岩效果较好的工程措施。选取滇中引水隧洞高埋深、高水头、Ⅳ类围岩段为例,采用数值分析的方法探讨了超前灌浆深度的合理化选取,并对比分析了有无超前灌浆下洞周围岩的加固和防渗效果。结果表明,与无超前灌浆相比,在合理的灌浆深度下洞周围岩的变形量和破坏深度及隧洞的渗水量均明显减小,超前灌浆达到了加固围岩和防渗的双重效果,为实际施工中遇到类似问题提供了切实可行的建议。
In view of the abundant groundwater and the geological conditions of complex sections using advanced grouting technology is to solve the gushing water and strengthening of surrounding rock better engineering measures. Taking diversion tunnels in Yunnan Province as examples, the depth, high head and Ⅳ type of surrounding rock are taken as examples. The reasonable selection of advanced grouting depth is discussed by numerical analysis. The reinforcement and prevention of the surrounding rock with or without advanced grouting Infiltration effect. The results show that compared with no advance grouting, the deformation and destruction depth of rock and the seepage of tunnel under the reasonable grouting depth are obviously reduced. The advanced grouting achieves the double effect of strengthening surrounding rock and preventing seepage, which is Practical construction encountered similar problems provide practical advice.