乌东德地下厂房层面小夹角判定及支护设计

发布时间：2018-09-08 08:58

【摘要】：乌东德地下厂房洞室群赋存于陡倾下游的层状浅变质岩中,上游边墙易产生沿岩层层面的剪切滑移变形,下游边墙易产生倾倒变形,且变形程度与岩层走向和厂房纵轴线之间夹角的大小密切相关。为明确不同夹角对地下厂房洞室群围岩变形与稳定的影响,并为层面小夹角洞段的判定提供依据,采用三维离散元法,分别分析夹角为0°、10°、20°的情况。结果表明,夹角小于20°时,洞周围岩位移量值水平及其塑性区分布范围及深度明显增大,而夹角分别为0°、10°时,计算结果差异较小;据此,定义夹角小于20°的洞段为层面小夹角洞段。同时提出了支护设计参数,目前左右岸地下厂房开挖已完成,监测结果验证了支护设计的合理性。相关思路及方法可为同类工程提供参考。
[Abstract]:The cavern group of underground powerhouse in Udongde is located in the stratified shallow metamorphic rock downstream of steep dip. The upper side wall is prone to shear slip deformation along the rock layer, and the downstream side wall is prone to topple deformation. The degree of deformation is closely related to the angle between the strata and the longitudinal axis of the workshop. In order to make clear the influence of different angles on the deformation and stability of surrounding rock of underground powerhouse cavern group, and to provide the basis for judging the tunnel segment with small angle of plane, the case of the angle of 0 掳10 掳~ 20 掳is analyzed by using three-dimensional discrete element method. The results show that when the angle is less than 20 掳, the level of rock displacement and the distribution range and depth of plastic zone increase obviously, while when the angle is 0 掳or 10 掳, the difference is small. The hole section with less than 20 掳angle is defined as the section with small plane angle. At the same time, the parameters of support design are put forward. At present, the excavation of underground powerhouse on left and right bank has been completed, and the monitoring results verify the rationality of the support design. Relevant ideas and methods can provide reference for similar projects.
【作者单位】：长江勘测规划设计研究有限责任公司枢纽设计处;长江科学院水利部岩土力学与工程重点实验室;
【分类号】：TV731.6

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