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首页> 外文期刊>Rock Mechanics and Rock Engineering >True Three-Dimensional Geomechanical Model Tests for Stability Analysis of Surrounding Rock During the Excavation of a Deep Underground Laboratory
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True Three-Dimensional Geomechanical Model Tests for Stability Analysis of Surrounding Rock During the Excavation of a Deep Underground Laboratory

机译：基于地下实验室挖掘过程中周围岩石稳定性分析的真实三维地质力学模型试验

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摘要

Geological disposal at deep burial depths is a widely accepted method for the treatment of high-level radioactive waste, in which an underground laboratory is regarded as an essential facility to connect various aspects of the process. To evaluate the excavation-induced stability of the rock mass surrounding the underground laboratory for deep geological disposal of high-level radioactive waste in Beishan, Gansu Province, true three-dimensional geomechanical model tests are carried out for the first time. A model test loading system is developed with an intelligent numerical control function and automatic excavation apparatuses. The variations in the displacement and stress surrounding the caverns are revealed. The test results indicate that after excavation, (1) the surrounding rock deforms toward the cavern with small displacements less than 3 mm; (2) the radial stress is lower, and the tangential stress is higher; tensile stress is induced in certain parts near the intersection of caverns but at a magnitude lower than the tensile strength of the rock; (3) the excavation-induced perturbation reaches approximately 1.5-2.0 times the cave diameter; and (4) the surrounding rock shows stability after excavation due to the favorable geological conditions and the overall high strength of the surrounding rock. Nevertheless, enhanced support via combined bolting and shotcrete are recommended at the crossing sections. The research results verify the rationality of the design scheme and provide important guidance for the construction of underground laboratories for deep underground disposal of high-level radioactive waste.
机译：深埋深度的地质处理是一种广泛接受的用于治疗高级放射性废物的方法，其中地下实验室被认为是连接过程各个方面的基本设施。为了评估岩山，甘肃北山高级放射性废物深层地质处理地下地质处理围绕地下地质处理的岩体稳定性，第一次进行真正的三维地质力学模型试验。模型试验装载系统采用智能数值控制功能和自动挖掘设备开发。揭示了围绕洞穴的位移和应力的变化。测试结果表明，在挖掘后，（1）周围岩石朝向小于3毫米的小型位移的洞穴变形; （2）径向应力较低，切向应力较高;拉伸应力在洞穴交叉口附近的某些部位诱导，但在低于岩石的拉伸强度的幅度下; （3）挖掘诱导的扰动达到洞穴直径约1.5-2.0倍; （4）周围的岩石由于良好的地质条件和周围岩石的总体高强度而显示出挖掘后的稳定性。尽管如此，在交叉部分建议使用通过组合螺栓连接和喷射器增强的支持。研究结果验证了设计方案的合理性，为高级放射性废物的深层地下处置建设提供了重要指导。

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