CAJ | 학술논문

针对乌东德水电站左岸地下厂房区的角砾岩这一不良地质体的地质力学与稳定性问题，首先采用系统的工程现场调查、孔内电视观察和室内力学试验，揭示了角砾岩基本的物理力学特征以及特殊的方解石胶结方式、似熔融的接触特征和强度特征；进而通过三维数值模拟评估了开挖卸荷后主厂房顶拱角砾岩的基本力学特征，阐明其围岩支护设计的基本要求；左岸主厂房角砾岩实际开挖与支护实践的经验总结分析表明，洞室顶拱稳定性良好。从上述多角度研究表明，由于该类角砾岩经历成岩作用，具有较好的自稳性和承载能力，经合理加强支护后可以作为大型地下洞室顶拱的承载围岩，其力学特性认识和工程防治经验可为同类不良地质体的工程处置借鉴。
침대오동덕수전참좌안지하엄방구적각력암저일불량지질체적지질역학여은정성문제，수선채용계통적공정현장조사、공내전시관찰화실내역학시험，게시료각력암기본적물리역학특정이급특수적방해석효결방식、사용융적접촉특정화강도특정；진이통과삼유수치모의평고료개알사하후주엄방정공각력암적기본역학특정，천명기위암지호설계적기본요구；좌안주엄방각력암실제개알여지호실천적경험총결분석표명，동실정공은정성량호。종상술다각도연구표명，유우해류각력암경력성암작용，구유교호적자은성화승재능력，경합리가강지호후가이작위대형지하동실정공적승재위암，기역학특성인식화공정방치경험가위동류불량지질체적공정처치차감。
The breccia, a typical unfavorable geologic body in Wudongde hydropower station with low strength, poses a potential threat to the stability of underground cavern in left bank. Firstly, physico-mechanical properties of breccia, as well as the strength, cementation with limestone, dolomite and marble, and fusing contact characteristics are obtained by in-situ investigation and borehole television, and experiments in laboratory. Following that a 3D numerical simulations, which consider the left hill and underground cavern and are suggested mechanical parameters, are performed to simulate the excavating of main powerhouse for revealing the mechanical responses of breccia in roof during excavation. The simulated result provides useful information for detail design of rock supporting by showing the calculated failure approach index. The responding supporting design including the prestressed rock bolt, shotcrete and prestressed anchor cable. In-situ practice involving rock excavation and reinforcement indicates that the breccia in the roof remains stable, which is also confirmed by in-situ monitoring deformation with convergence pattern. This analysis indicates that the breccia can be adopted as load bearing rock in view of the acceptable self-stability and compressive strength related to the diagenesis process. Detail excavating and supporting schemes which utilizes the relaxing-inhibition supporting idea are applicable and practical.