山岭隧道高压富水断层破碎带注浆施工技术

Grouting Technology for Construction of Mountain Tunnel in High-pressure Water-rich Fault Fracture Zone

研究目的:山岭隧道断层破碎带地层岩性复杂,围岩破碎,在地下水补给源充分的条件下,极易发生高压突水等地质灾害,严重影响施工安全和进度。为了有效地预测和治理隧道断层破碎带涌水,防止发生隧道突发涌水等地质灾害,需要对断层破碎的地质特征以及处理措施进行深入研究。研究结论:隧道注浆堵水的方式一般要结合现场开挖揭示围岩情况和前方地层超前预报结果合理选择。隧道高压富水断层破碎带应采取超前预注浆堵水措施,以达到降低围岩的渗透系数,减少地下水流失的目的。注浆结束后应采取施作检查孔等方法对注浆效果进行检查和评定。

Research purposes： The geological disaster of high-pressure water bursting easily happens in construction of mountain tunnel in fault fracture zone with complex lithology and rock crushing under condition of the sufficient groundwater recharge source and it seriously affects the safety and progress of the construction.In order to effectively predict and control the water-inrushing from the fracture zone and prevent the appearance of the water-bursting into the tunnel,it is necessary to do the research on the characteristics of the fault fracture zone and treatment measures.Research conclusions：Reasonable adoption of tunnel grouting method should depend on the surrounding rock conditions revealed by excavation along with the predicted results.For construction of the tunnel in high-pressure water-rich fault fracture zone,the advanced grouting should be used to reduce the penetration coefficient of the surrounding rocks and losing the underground water.After grouting,the inspection assessment should be made to the grouting effect by inspection hole.