深埋隧洞极强岩爆段隧道掘进机半导洞掘进岩爆风险研究

深埋隧洞TBM（隧道掘进机）全断面掘进时，在局部超高应力集中的完整硬脆性岩体洞段将直面极强岩爆的风险，设备和人员的安全将遭受极大的威胁。在锦屏II水电站3#引水隧洞极强岩爆段实施了“先半导洞+TBM联合掘进”实验，结合微震实时监测信息对TBM半导洞掘进的岩爆风险开展了研究。监测结果表明，（1）TBM半导洞掘进期间，日平均微震事件数、日平均辐射微震能、微震大事件数及实际岩爆发生次数和强度均远远低于TBM全断面掘进；（2）能量指数对数值和累积视体积的时域演化表明，TBM半导洞掘进强烈岩爆发生的风险远低于TBM全断面掘进，现场实际开挖也证明了这一点；（3）半导洞洞段微震事件的空间集结程度、总数、震级大小与能量辐射均远小于全断面洞段。因此，TBM半导洞掘进的岩爆风险远远低于TBM全断面掘进，在具有施工条件的情况下采用先半导洞预处理，然后TBM半断面掘进极强岩爆段，以期控制岩爆风险的方案是可行的。

Rockburst risk of tunnel boring machine part-pilot excavation in very strong rockburst section of deep hard tunnel

Tunnel boring machine(TBM) should face the risk of very strong rockburst directly in intact and brittle rock mass section with ultrahigh stress concentration for full-face excavation in deep tunnel;then safety of equipment and personnel will be under great threat.The excavation test through part-pilot heading + TBM is carried out in the diversion tunnel #3 of the Jinping II hydropower station and the rockburst risk of TBM part-pilot excavation is researched via real-time microsesimic monitoring.The results ...