CAJ | 학술논문

TBM具有快速掘进的特点，但在不良地质条件下由于设备和支护能力的限制，其正常掘进受到影响，面临卡机甚至停工的风险。锦屏二级水电站引水隧洞一般埋深超过1500 m，地质条件复杂，TBM在通过白山组破碎大理岩洞段时，由于围岩破碎、强度较低、自稳能力差，需要对掘进中的风险进行评估。首先利用现场围岩的开挖响应，确定破碎岩体的初始力学参数，之后通过计算对比不同质量岩体的变形和TBM正常掘进所需推力大小，发现在破碎岩体中掘进所需推力已经超过了 TBM 设备自身能够提供的最大推力，并且围岩变形也很难限制在TBM的扩挖能力范围之内，而围岩在撑靴压力的作用下已经发生破坏，无法提供足够的推进力保证TBM顺利掘进。为此提出了先导洞方案，计算结果表明利用先导洞能缓解释放的变形量，避免卡机风险。最后提出了其他支护优化设计和应对策略。研究成果可为类似的工程施工提供参考。
TBM구유쾌속굴진적특점，단재불량지질조건하유우설비화지호능력적한제，기정상굴진수도영향，면림잡궤심지정공적풍험。금병이급수전참인수수동일반매심초과1500 m，지질조건복잡，TBM재통과백산조파쇄대리암동단시，유우위암파쇄、강도교저、자은능력차，수요대굴진중적풍험진행평고。수선이용현장위암적개알향응，학정파쇄암체적초시역학삼수，지후통과계산대비불동질량암체적변형화TBM정상굴진소수추력대소，발현재파쇄암체중굴진소수추력이경초과료 TBM 설비자신능구제공적최대추력，병차위암변형야흔난한제재TBM적확알능력범위지내，이위암재탱화압력적작용하이경발생파배，무법제공족구적추진력보증TBM순리굴진。위차제출료선도동방안，계산결과표명이용선도동능완해석방적변형량，피면잡궤풍험。최후제출료기타지호우화설계화응대책략。연구성과가위유사적공정시공제공삼고。
TBM is known for its quick driving,but the normal driving will be affected under the unfavorable geological condition because of the limitation of equipment and the supporting capacity. TBM faces the risk of lock and even shutdown. The general depth of Jinping II diversion tunnel is more than 1 500 m,and the geological condition is very complex. When TBM driving in unfavorable geological period of Baishan group,due to the low strength of broken surrounding rock,and the poor steady ability,the risk of TBM driving need to be evaluated. First the initial mechanical parameters of rock mass were studied by excavation response of field surrounding rock. Then,comparing the displacement of different quality of rock mass and the thrust needed for TBM driving,it was found that the required thrust in the unfavorable geological condition has exceeded the provide maximum thrust, and that the displacement is also hard to limit in the range of TBM expansion. The surrounding rock has been damaged in gripper compression,and cannot provide enough thrust to ensure TBM driving. The pilot tunnel was proposed,and the calculation results show that the pilot tunnel can relieve deformation to avoid lock. Other support optimization designs and coping strategies were presented. The research results can provide good reference for similar engineerings.