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REINFORCING MECHANISM AND SIMULATING METHOD FOR REINFORCING EFFECTS OF SYSTEMICALLY GROUTED BOLTS IN DEEP-BURIED HARD ROCK TUNNELS
Author(s): WU Wenping1, 2, FENG Xiating1, ZHANG Chuanqing1, QIU Shili1, LI Zhanhai3 Co., Ltd., Chongqing 401121, China, 3.College of Resources and Civil Engineering, Northeastern University, Shenyang, Liaoning 110004, China)
Pages: 2711-
2721
Year: 2012
Issue:
S1
Journal: Chinese Journal of Rock Mechanics and Engineering
Keyword: 隧道工程; 深埋隧洞; 锚杆; 岩体劣化模型; 破坏接近度; 等效塑性应变;
Abstract: 系统布置的砂浆锚杆是深埋硬岩隧洞主要支护结构,锚杆与围岩组成锚杆–围岩复合结构体,使围岩的力学特性得到改善。基于岩体的莫尔–库仑(M-C)屈服准则,推导锚杆–围岩复合结构体满足M-C准则的应力条件。结合岩体劣化本构模型,提出确定锚杆–围岩复合结构体力学参数的方法。锚杆与弹性围岩和屈服围岩组成的锚杆–围岩复合结构体的力学参数确定方法不同,锚杆与屈服围岩组成的锚杆–围岩复合结构体的力学参数与围岩当前状态的等效塑性应变有关。基于此提出一种模拟隧洞开挖支护过程中系统普通砂浆锚杆加固效果的数值方法。该方法能较好地模拟锚杆支护时机对围岩稳定性的影响。最后运用该方法对锦屏II级水电站2#引水隧洞围岩稳定性进行分析,为隧洞的施工和支护设计提供参考依据。
Citations
System Exception