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锦屏一级水电站地下厂房围岩开裂变形机制研究

ISSN号：1000-6915
期刊名称：《岩石力学与工程学报》
时间：0
分类：TU45[建筑科学—岩土工程;建筑科学—土工工程]
作者机构：[1]长江科学院水利部岩土力学与工程重点实验室,湖北武汉430010, [2]滩水电开发有限公司锦屏建设管理局,四川成都610021
相关基金：国家自然科学基金资助项目（50639090）; “十一五”国家科技支撑计划课题（2008BAB29B01）; 水利部公益性行业科研专项经费项目（201001009）

作者：卢波[1], 王继敏[2], 丁秀丽[1], 邬爱清[1], 段绍辉[2], 黄书岭[1]

关键词：岩石力学, 锦屏一级水电站, 地下厂房, 高地应力, 全空间赤平投影, 低强度应力比, 围岩变形开裂机制, rock mechanics, Jinping I hydropower station, underground powerhouse, high in-situ stress, stereographic projection, low strength stress ratio, deformation and cracking mechanism of surrounding rock

中文摘要：

针对锦屏一级水电站地下厂房高应力、低强度应力比条件下开挖施工引起的围岩变形开裂及相关力学问题,从全空间赤平投影解析、平面投影应力特征等多角度全方位研究地下厂房区地应力场分布特征及规律;并结合力学定性分析和三维数值模拟等手段对地下洞室群围岩变形开裂机制进行深入分析,研究洞室群围岩开挖损伤演化规律。研究表明,锦屏一级地下厂房区域出现的围岩、喷层较大变形乃至破坏现象本质上是由高地应力和相对较低的岩体强度形成的不利组合所造成的,在主厂房、主变室的拱腰、拱座和边墙以及母线洞侧墙等部位出现的开裂破坏,属于典型的高应力、低强度应力比条件下围岩的卸荷变形与破坏。提出锦屏地下厂房围岩变形开裂概化模型,为地应力场反演和施工过程的数值仿真分析提供重要参考和定性依据;最后针对开挖维护围岩稳定性问题提出相应的建议,为锦屏一级地下厂房的开挖施工及动态支护设计提供技术支持。

英文摘要：

Aiming at the deformation and cracking phenomena of surrounding rock mass during the excavation of Jinping I hydropower station underground powerhouse under the conditions of high stress and low strength stress ratio,the characteristics and laws of in-situ stress field are studied entirely by the stereographic projection method and projection stress on typical planes.The deformation and cracking mechanism of surrounding rock of underground caverns group are deeply analyzed through mechanical qualitative analysis and 3D numerical simulation;and the damage evolution law of surrounding rock is studied.The results show that the relatively large deformation and cracking phenomena of surrounding rock and shotcrete layer of underground powerhouse are caused essentially by the adverse combination of the high ground stress and relatively low rock strength.The cracking failures in haunch,arch abutment and side wall of main powerhouse and main transformer chamber,and in side wall of busbar tunnels are typical unloading deformations and failures under the conditions of high stress,low strength stress ratio.The generalized model of surrounding rock deformation and cracking of underground powerhouse is presented.It affords important reference and qualitative basis for the back analysis of in-situ stress field and the numerical simulation of excavation process.Finally,some advices are given to maintain the stability of surrounding rock mass.All the results afford technical support to the construction and dynamic support design of the underground powerhouse.

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