CAJ | 학술논문

针对水电站地下厂房开挖过程中顶拱出现局部坍塌和变形持续发展的现象，结合地质资料、监测成果和施工过程，对变形产生的原因从表面宏观变形表现和深部位移特征2个角度作定性和定量的分析。分析结果表明，在地下洞室开挖过程中产生的坍塌和垮塌现象，主要是受开挖后应力重分布，以及爆破作业的影响，形成的小型不稳定块体，断层及裂隙结构面的存在是主要地质因素，支护滞后是造成局部坍塌的主要施工因素。因此，考虑岩体的非连续性，施工期采取有力的支护措施对确保顶拱围岩稳定十分重要。平行施工在一定程度上可以加快施工进度，但对围岩位移会造成一定影响。对于顶拱围岩而言虽然施工作业面已远离，但由于施工强度大、爆破频繁，对顶拱部位围岩位移发展仍具有一定的控制作用，因此在复杂地质条件下施工过程中应尽量避免平行施工。
침대수전참지하엄방개알과정중정공출현국부담탑화변형지속발전적현상，결합지질자료、감측성과화시공과정，대변형산생적원인종표면굉관변형표현화심부위이특정2개각도작정성화정량적분석。분석결과표명，재지하동실개알과정중산생적담탑화과탑현상，주요시수개알후응력중분포，이급폭파작업적영향，형성적소형불은정괴체，단층급렬극결구면적존재시주요지질인소，지호체후시조성국부담탑적주요시공인소。인차，고필암체적비련속성，시공기채취유력적지호조시대학보정공위암은정십분중요。평행시공재일정정도상가이가쾌시공진도，단대위암위이회조성일정영향。대우정공위암이언수연시공작업면이원리，단유우시공강도대、폭파빈번，대정공부위위암위이발전잉구유일정적공제작용，인차재복잡지질조건하시공과정중응진량피면평행시공。
Aiming at the phenomenon of partial cracking and deformation of surrounding rock mass developing continuously at arch crown in the underground powerhouse,based on geology,monitoring data and construction process,qualitative analysis and quantitative analysis are made respectively combining with information of macroscopic deformation character and results of safety monitoring. The phenomena of collapse and crack occurred during the excavation of underground caverns is mainly formed by small unstable blocks because of stress distribution and blasting effect. Among the causes of its formation,the structure surface of fault and rock cracks is the main geological factor,and supporting lag is the main factor of construction. So considering the discontinuous characteristics of rock masses,it is important to take timely and effective support measures to ensure that surrounding rock mass of arch crown is in situation of stability. Parallel construction can speed up the construction progress in a certain extent,but it could have an effect on the displacement of surrounding rock. In the situation of parallel construction,although construction work has been far from arch crown,due to high construction intensity and frequent blasting,the displacement development of surrounding rock mass is still controlled obviously by construction schedule. So under the condition of complex geology,it is very necessary to avoid the parallel construction during construction process.