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本电站地下厂房的地质条件比较复杂。施工过程中,建筑物的围岩发生较明显的变形,多处混凝土衬护出现较密集的裂缝,引起关心和重视。为了监测和研究围岩的整体稳定性和建筑物结构的受力情况,按装了内部原型观测和外部裂缝观测设备。为了研究地下洞室的永久运行安全性,还进行了岩石力学和有限单元分析计算工作。综合分析表明,产生围岩变形和混凝土衬护裂缝的主要原因是岩体内地应力大,及开挖后侧向应力解除所致。边墙经采取适当的加固措施而趋于稳定。对中间岩柱的分析表明.应力分布不均一,应力增长尚不过大,且局限于较小的范围内;剪应力也不太大。因此,可以认为岩柱仍然是稳定的。今后还要继续加强原型观测和研究工作。
The underground power plant underground geological conditions are more complicated. During the construction process, the surrounding rock of the building has obvious deformation, and many concrete linings appear more dense cracks, which cause concern and attention. In order to monitor and study the overall stability of the surrounding rock and the stress on the structure of the building, internal prototype observation and external fracture observation equipment were installed. In order to study the permanent operation of underground caverns, rock mechanics and finite element analysis calculations have also been carried out. Comprehensive analysis shows that the main reason for the deformation of surrounding rock and the crack of concrete lining is that the in-situ stress in the rock mass is large and the lateral stress relieves after excavation. The side walls tended to stabilize with appropriate reinforcement measures. Analysis of the middle column shows that the stress distribution is not uniform, the stress growth is not too large, and is limited to a smaller range; shear stress is not too large. Therefore, it is considered that the rock pillar is still stable. In the future, we will continue to step up prototype observation and research work.