| 摘要: |
| 在运行过程中，某水电站引水隧洞出口高边坡监测数据显示，边坡中上部出现了反常的向上游变形的趋势，此种变形有别于一般边坡的变形规律.在详细分析地质资料、监测数据和外界影响因素的基础上，对引水隧洞出口高边坡的变形机理进行了深入探讨，结果发现1998年库区遭遇的千年一遇的洪水是边坡变形趋势改变的重要诱因，边坡上硬下软的岩体构造特性和充分发育的层间剪切带是其变形的内在原因，边坡岩体的卸荷流变、库水位变化、降雨和泄洪雾化、岩体风化、水-岩长期作用等是变形发展的外界因素.目前，边坡各监测点的变形基本趋于稳定，但在后期运行过程中边坡变形发展趋势仍然值得关注.因此，必须坚持长期监测，发现异常情况应及时分析处理. |
| 关键词: 引水隧洞 高边坡 变形机理 |
| DOI： |
| 分类号:TU457 |
| 基金项目:国家自然科学基金委员会、二滩水电开发有限责任公司雅砻江水电开发联合研究基金资助项目( 50579092) ；教育部“新世纪优秀人才支持计划”资助项目( N2CET-05-0679) |
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| Research of deformation mechanism for high slope linked with a hydropower station diversion tunnel outlet |
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CHEN Xing-zhou1, CHAI Jun-rui1, BAI Jun-guang2
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1.Institute of Water Conservancy and Hydropower, Xi′an University of Science and Technology;2.Northwest Hydro Consulting Engineering, CHECC, Xi′an
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| Abstract: |
| During the operation of a hydropower station diversion tunnel linked with a high slope， the monitored data show that the upper slope has an abnormal deformation tendency towards the upstream， which is different from the general slope deformation law. The deformation mechanism of the high slope linked with the hydropower station diversion tunnel outlet is analyzed in detail based on detailed analysis of the geological data， monitored data and external influence factors. A thousand-year frequency flood in 1998 is an obvious primary factor affecting the change in deformation tendency. At the same time, slope′s structural features of rigidity upwards and weakness doamwards and the fully developed interlayer shear zones are the internal reasons of the slope deformation； excavation unloading of the slope， reservoir impoundment， change in reservoir water level， rain， flood atomization， rock mass weathering， long-term interaction given by water and rock mass must be the other external factors influencing and aggravating the rock mass deformation. At present， the deformation at the basic monitoring points trends towards stability， however the joints， fractures， faults and interlayer shear zones have a very important role in the deformation and stability of the slope. Therefore， it is important to keep the long-term monitoring， and any unusual case must be analyzed and handled in time. |
| Key words: diversion tunnel high slope deformation mechanism |
