| 冯玉华,刘瑞军,赵双喜.当顺水电站发电隧洞出口段支护方案探讨[J].矿产勘查,2010,1(5):503-505 |
| 当顺水电站发电隧洞出口段支护方案探讨 |
| Research on supporting at generation tunnel exit section of Dangshun Hydropower Station |
| 投稿时间：2009-11-19 |
| DOI： |
| 中文关键词: 隧洞 围岩分类 断层破碎带 支护方案 |
| 英文关键词: tunnel surrounding rock classification fault/fracture zone supporting scheme |
| 基金项目: |
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| 中文摘要: |
| 依据当顺水电站发电隧洞出口段岩性、构造、地下水等工程地质条件,对岩体围岩进行分类。该段岩性为三叠系中统板岩与砂岩,呈薄层状,岩体节理发育,风化强烈,有压扭性断层通过,破碎带宽25～30m,由压碎岩、糜棱岩组成,呈散体结构,断层走向与洞轴线夹角35°～45°,对围岩稳定影响较大。存在基岩裂隙水,呈带状分布,隧洞内沿断层有渗水现象,地下水活动轻微,围岩属极不稳定,为Ⅴ类围岩。针对发电隧洞Ⅴ类围岩提出支护方案,根据支护效果,探讨隧洞围岩支护方案。 |
| 英文摘要: |
| Based on engineering geological conditions at generation tunnel exit section of Dangshun Hydropower Station such as lithology, structure, underground water and so on, the authors classified surrounding rock of the tunnel into the Middle Triassic thin laminated slate and sandstone with strong weathering. There is a compresso-shear fault cutting the above rock and the fault/fracture zone is 25 ~ 30m thick, consisting of crushed rocks and mylonite showing granular structure, and the angle between fault strike and the cavity axis is 35 ~ 45?, which is a great impact on the stability of surrounding rock. The surrounding rock, classified as the rock type V, is extremely unstable due to the existence of bedrock fracture water with belt-shaped distribution, the seep phenomenon along the fault in the tunnel, and the slight activity of ground water. The authors proposed the supporting scheme on V surrounding rock of the tunnel, and studied the supporting scheme for surrounding rock of the tunnel according to the effect of support. |
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