高地应力与强渗透水压下软弱围岩支护  

Support for weak surrounding rock under high geo-stress and high seepage pressure condition

作　　者：苏国韶[1] 燕柳斌[1] 李海[1] 符兴义[1] 

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004

出　　处：《广西大学学报（自然科学版）》2009年第5期613-617,共5页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(50809017);中国博士后科学基金资助项目(20080440812);广西科学基金资助项目(桂科自0832023)

摘　　要：为了解决锦屏Ⅱ级水电站引水隧洞工程中高地应力和高渗透水压力条件下破碎带洞段软弱围岩合理支护的关键技术问题,应用弹塑性基于流固耦合原理的三维快速拉格朗日有限差分法,分析比较了不同支护方案下隧洞围岩塑性区分布范围与变形特征。研究结果表明,在高地应力和高渗透水压力条件下,根据将围岩视为承载结构以充分发挥围岩承载能力的设计理念,围岩支护采用可使围岩与支护结构充分地联合承载的喷锚支护、固结灌浆和混凝土衬砌的联合支护型式,这是解决高地应力与强渗透水压力联合用下软弱围岩稳定性问题的有效途径。The determination of reasonable support for weak zone of diversion tunnel under high geostress and high seepage pressure condition is a challenging key problem in the construction of Jinping Ⅱ hydropower station. In order to solve the problem, reasonable support types for weak zone of the diversion tunnel are compared using FLAC3D（ fast lagrangian analysis of continua in 3 dimensions） numerical program based on coupled fluid-mechanical theory. According to the analysis results, recommended scheme of support designed for weak zone of the diversion tunnel under high geo-stress and high seepage pressure condition is proposed. The analysis results indicate that the combinational support type, including bolting, shotconcrete, consolidation grouting and lining is effective to solve the stability problems of surrounding rock of weak zone under high geo-stress and high seepage pressure condition according to the design idea of regarding surrounding rockmass as the main structure for carrying load or making full use of load bearing capability of surrounding rockmass.

关 键 词：引水隧洞 围岩稳定 支护 流固耦合 

分 类 号：TV732[水利工程—水利水电工程]