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基于深部地下工程围岩反复承受地质力作用和开挖扰动,其完整性和力学性能弱化的现实,认为其应力-应变关系服从峰后软化的遍布节理模型,然后考虑节理、原岩应力以及影响岩体性质的变形参数和强度参数等因素,设计模拟方案,利用FLAC3D数值软件,再现了围岩分区破裂化过程。模拟结果表明:节理的存在和分布对分区破裂化现象的形态和规模存在很大影响。岩体强度与原始应力场的相对关系是引发围岩分区破裂化的关键。当初始地应力超出岩体单轴抗压强度时,围岩将出现分区破裂现象,初始力相对于岩体强度、泊松比的增大与分区破裂的数目、破裂区延伸长度、破裂区范围等成近似的正比,而内摩擦角则呈现相反趋势。这一结果部分揭示了分区破裂发生的力学机制,为深部围岩支护设计理论的建立提供了有益参考。
Based on the fact that the surrounding rock of deep underground engineering is subjected to repeated geological and structural disturbances and the weakening of its mechanical properties, the stress-strain relationship is assumed to follow the post-peak-softening all-joint model, and then the joint stresses, Rock mass deformation parameters and strength parameters and other factors, the design of simulation programs, the use of FLAC3D numerical software to reproduce the surrounding rock partitioning cracking process. The simulation results show that the existence and distribution of joints have a great influence on the morphology and scale of the phenomenon of zonal disintegration. The relative relationship between the strength of rock mass and the original stress field is the key to triggering the cracking of the surrounding rock partition. When the initial stress exceeds the uniaxial compressive strength of rock mass, the surrounding rock will appear the phenomenon of zonal disintegration, the initial force relative to the rock mass strength, the increase of Poisson’s ratio and the number of zonal disintegration, the extension of rupture zone, the range of rupture zone Equal to the approximate proportional, while the angle of friction showed the opposite trend. This result partially reveals the mechanics mechanism of zonal disintegration and provides a useful reference for the establishment of deep surrounding rock support design theory.