“双碳”目标和能源可持续发展背景助力下,抽水蓄能电站建设正迈向高质量蓬勃发展阶段,但也涌现出大量地质条件复杂、地应力高、大跨度、施工强度高难度大的大型深埋地下厂房洞室群。准确、安全、高效地开展复杂地质条件下大型深埋地下洞室群围岩稳定分析,是确保抽水蓄能电站合理设计、安全建设和平稳运行的重要支撑。雅砻江两河口混合式抽水蓄能电站地下厂房洞室群规模庞大、洞室密集、施工条件复杂,洞室群围岩稳定影响因素复杂多样。本文基于考虑结构面非连续变形特征的离散单元法,开展雅砻江两河口混合式抽水蓄能电站三维大型地下洞室群围岩稳定数值研究。利用大型离散元软件3DEC建立地下厂房洞室群三维数值计算模型,结合孔径变形法实测数据反演洞室群地应力场,综合考虑层理及挤压带等不利结构面以及支护方案,从洞室群整体稳定性、支护方案评价及洞室群局部稳定分析方面开展了围岩稳定分析,可为设计施工提供依据参考。
Under the background of the “dual carbon” goals and sustainable energy development, the construction of pumped storage power stations is entering a stage of high-quality and rapid growth. However, this process has also brought about a large number of deeply buried underground cavern groups characterized by complex geological conditions, high in-situ stress, large spans, and high construction difficulty. Accurately, safely, and efficiently analyzing the stability of surrounding rock in such complex geological settings is a key technical support for the rational design, safe construction, and stable operation of pumped storage power stations. The underground powerhouse cavern group of the Lianghekou hybrid pumped storage power station on the Yalong River is notable for its massive scale, high cavern density, and complex construction conditions, with numerous interrelated factors affecting rock mass stability. In this study, a three-dimensional numerical investigation of the surrounding rock stability of this large underground cavern group is conducted based on the discrete element method, which accounts for the discontinuous deformation characteristics of structural planes. A 3D numerical model of the cavern group is established using the large-scale discrete element software 3DEC, and the in-situ stress field is back-calculated using field-measured borehole deformation data. The model comprehensively considers unfavorable structural features such as bedding planes and extrusion zones, as well as different support schemes. The stability analysis is carried out from three perspectives: overall stability of the cavern group, evaluation of support schemes, and local stability of key areas, providing technical references for engineering design and construction.
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