沉降-地震耦合作用下穿越地裂缝地下综合管廊灾变行为与性能评估方法研究

地裂缝发育区地下综合管廊无法实现空间避让，其在沉降-地震耦合作用下破坏机理尚不明确，缺少有效的灾变控制措施，穿越地裂缝地下综合管廊安全受到严重威胁。本项目拟对沉降-地震耦合作用下穿越地裂缝地下综合管廊灾变行为和性能评估方法进行研究：通过地裂缝沉降活动试验和数值模拟，揭示地裂缝不均匀沉降作用下穿越地裂缝地下综合管廊的损伤分布与发展规律；考虑地裂缝沉降活动对综合管廊力学性能的劣化影响，开展穿越地裂缝地下综合管廊振动台试验并结合有限元分析，研究非一致性地震激励下穿越地裂缝地下综合管廊抗震性能和破坏机理，确定其地震灾变影响范围；基于穿越地裂缝地下综合管廊的损伤演化过程，建立能反映其灾变特征的多参数损伤模型，确定地下综合管廊不同阶段的性能水平和失效准则，提出穿越地裂缝地下综合管廊的性能评估方法。本项目可为地裂缝场地地下综合管廊的地震灾变机理与控制研究提供理论依据，具有重要的科学意义和工程应用价值。

In the ground fissure area, the underground utility tunnels cannot avoid ground fissures in spaces. The damage mechanism is not clear for utility tunnels crossing the ground fissure under the coupling action of settlement and earthquake. Additionally, effective disaster control measures have not been proposed, and the safeties of the utility tunnels are seriously threatened. The catastrophic behavior and performance evaluation of the utility tunnel crossing the ground fissure under the coupling action of settlement and earthquake will be studied. Through the experiment and numerical simulation of ground fissure settlement activity, the damage distribution and development for utility tunnels subjected to the uneven settlement of the ground fissure will be revealed. Considering the deterioration effect on the mechanical properties of utility tunnels caused by the ground fissure settlement, shaking-table tests and finite element analysis on the utility tunnel crossing the ground fissure will be performed to reveal the seismic response and failure mechanism of the utility tunnel crossing the ground fissure under non-uniform seismic excitation, and the scope of region influenced by earthquake disaster for utility tunnel crossing the ground fissure is to be determined. Based on the damage evolution process of the utility tunnels in different stages, a multi-parameter damage model reflecting the catastrophic characteristics of the utility tunnel crossing ground fissure under the coupling action of settlement and earthquake will be developed. Moreover, the performance level and associated failure criterion of the utility tunnel at different loading stages will be determined, and the performance evaluation method for utility tunnels crossing the ground fissure will be proposed. The research can provide a theoretical basis for the study of earthquake disaster mechanism and control measure for utility tunnels in the ground fissure site, and it has important scientific significance and application value.