1.大连理工大学建设工程学部,辽宁 大连116024
2.南水北调中线信息科技有限公司,北京 100176
史新伟(1983—),男,博士研究生。主要从事地下结构损伤机理研究。E-mail: 76517097@qq.com
冯新(1971—),男,教授,博导,博士。主要从事结构工程健康监测与安全评价、工程结构防灾等研究。E-mail: fengxin@dlut.edu.cn
收稿:2022-04-13,
修回:2022-06-19,
纸质出版:2023-10-15
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史新伟,冯新,范哲.逆断层作用下复合衬砌输水隧洞损伤演化分析[J].防灾减灾工程学报,2023,43(05):1132-1140.
SHI Xinwei,FENG Xin,FAN Zhe.Damage Evolution Analysis of Composite Lining Convey Tunnel under Reverse Fault[J].Journal of Disaster Prevention and Mitigation Engineering,2023,43(05):1132-1140.
史新伟,冯新,范哲.逆断层作用下复合衬砌输水隧洞损伤演化分析[J].防灾减灾工程学报,2023,43(05):1132-1140. DOI: 10.13409/j.cnki.jdpme.20220413003.
SHI Xinwei,FENG Xin,FAN Zhe.Damage Evolution Analysis of Composite Lining Convey Tunnel under Reverse Fault[J].Journal of Disaster Prevention and Mitigation Engineering,2023,43(05):1132-1140. DOI: 10.13409/j.cnki.jdpme.20220413003.
复合衬砌是一种新型可承受高内压的输水隧洞衬砌结构,在穿越断层带时会由于断层错动作用发生破坏。因此,对复合衬砌输水隧洞穿越逆断层的损伤演化分析具有现实意义。通过考虑多重荷载和不同结构层间的分离模式,建立复合衬砌输水隧洞‑断层三维有限元模型,研究逆断层不同错动位移下复合衬砌结构损伤演化的过程,并对损伤状态进行量化评估。结果表明:逆断层作用下复合衬砌结构的损伤分为剪切损伤、拉伸损伤和失效破坏三个阶段。滑动面拱腰边墙处钢管受弯曲变形和局部屈曲耦合作用发生破坏是复合衬砌结构的最终破坏形式,破坏范围与滑动面呈“X”型分布向两盘延伸。由于不同材质性能和黏结特性的差异,断层作用导致不同结构层间发生脱离现象,脱离距离与错动位移呈正相关性。混凝土-钢管间脱离不同于混凝土-围岩间呈连续性分布,主要集中在钢管加劲肋附近。钢管内衬降低了混凝土开裂造成的内水外渗风险,增强了复合衬砌结构抵抗断层错动作用,提高了输水隧洞结构的安全裕度。
The composite lining is a new type of water conveyance tunnel lining structure that can withstand high internal pressure but may be damaged due to fault dislocation when crossing the fault zone. Therefore, it is of practical significance to analyze the damage evolution of composite-lined water conveyance tunnels passing through reverse faults. By considering multiple loads and the separation mode between different structural layers, a three-dimensional finite element model of composite-lined water conveyance tunnel-fault was established to study the damage evolution process of composite lining structures under different dislocation displacements of reverse faults, and to quantitatively assess the damage status. The numerical results show that the damage to composite lining structure under the action of reverse fault is divided into three stages: shear damage, tensile damage, and failure damage. The failure of the steel tube at the sidewall of the sliding surface arch under the coupling effect of bending instability and local buckling is the final failure mode of the composite lining structure, the damage range and sliding surface extend to the two plates in the “X” distribution. Due to differences in the properties and bonding properties of different materials, the fault action leads to the detachment phenomenon between different structural layers, and the detachment distance is positively correlated with the dislocation displacement. The separation between concrete and the steel tube differs from the continuous distribution between concrete and surrounding rock, which is mainly concentrated near the steel tube stiffener. The steel tube reduces the risk of internal water leakage caused by concrete cracking, enhances the resistance of composite lining structure to fault dislocation, and improves the safety margin of water conveyance tunnel structures.
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