摘要
引水隧洞穿越富水区并含有断层软弱破碎岩层时,常常会发生坍塌及大变形。文章针对干河泵站地下引水隧洞的复杂地质环境,提出了三维渗流应力损伤耦合的计算方法和显含断层薄层单元的模拟方法,计算模拟了引水隧洞复杂地质条件下超前固结灌浆后的开挖支护过程,定量评价了不同工况下引水隧洞围岩整体相对稳定状态,分析对比了有无超前固结灌浆下围岩破坏区分布及洞周变形变化规律。结果表明:超前固结灌浆后的围岩破坏和洞周位移变化情况明显减小;洞周围岩总破坏体积减少了1 252.9 m3,降低了43.98%;而断层处洞周位移最大值减小了54.92%。超前固结灌浆对断层破碎岩体的整体稳定有显著地改善。
Geological disasters such as collapse and large deformation often occur when a water diversion tunnel passes through a water-abundant zone and soft fractured rock stratum. Aimed at this complex geological environment, a calculation method of 3D seepage stress damage coupling and an explicit fault simulation method with thin-lamina elements are put forward. The excavation and support process of an underground diversion tunnel after advanced consolidation grouting is simulated, the relative stability of a rock mass passed by the water- diversion tunnel under different conditions is quantitatively evaluated, and a contrast analysis of the rock mass failure area distribution and deformation law of the surrounding rock around tunnels with and without advanced consolidation grouting is conducted. The results show that the rock mass failure volumes and the displacements around the cavern are obviously reduced by 43.98% for the former （namely 1 252.9 m3） and 54.92% for the maximum displacement around a tunnel after advanced consolidation grouting. Thus, the advanced consolidation grouting significantly improves the overall stability of fault-fractured rock.
出处
《现代隧道技术》
EI
CSCD
北大核心
2015年第2期97-104,共8页
Modern Tunnelling Technology
基金
国家重点基础研究发展计划973项目(2010CB732005)
国家自然科学基金重大研究计划(91215301)
国家自然科学基金资助项目(51279136
51209164)
中央高校基本科研业务费专项资金资助(No.2012206020203)
关键词
引水隧洞
渗流应力损伤耦合
断层破碎带
超前固结灌浆
数值模拟
Water diversion tunnel
Seepage-stress-damage coupling
Fractured fault zone
Advanced consolidationgrouting
Numerical simulation
