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在进行高水压山岭隧道注浆加固设计时,合理地确定注浆孔深度范围及其孔数是注浆堵水成功与否的关键。采用FLAC3D模拟对水库下方某山岭隧道注浆加固进行了数值模拟分析。对不注浆加固、注浆孔深度及其孔数等不同工况条件下围岩的渗流及塑性区的变化进行分析,并对单一变量进行优化比较。结果表明:未注浆加固情况下,隧道开挖引起拱顶、仰拱大范围围岩屈服破坏,洞周围岩坍塌、涌水突泥等风险较大;28个注浆孔且孔深30 m时较合理。
When designing the grouting reinforcement of high-pressured mountain tunnel, it is the key to determine the depth of grouting hole and its hole number reasonably whether it is successful or not. The FLAC3D simulation is used to simulate the grouting reinforcement of a mountain tunnel under the reservoir. The seepage and plastic zone changes of surrounding rock under different working conditions, such as non-grouting and reinforcement, the depth of grouting holes and the number of holes, were analyzed, and single variables were compared and optimized. The results show that under the condition of unconfined reinforcement, the surrounding rock of the dome and the inverted arch caused the yield failure, the rock surrounding the cave collapsed, More reasonable.