深大基坑复杂系统风险特征及耦合效应研究

Risk characteristics and coupling effect of complex system of deep and large foundation pit

为解决深大基坑施工系统事故发生机理不清,风险因素多样且复杂的问题,从系统视角分析了深大基坑施工风险系统性特征,基于复杂系统概念,构建了“基坑子系统、水文地质子系统和周围环境子系统”为一体的深大基坑施工复杂系统的概念框架。运用N-K模型量化分析各子系统间的耦合效应及对深大基坑复杂系统整体风险的影响大小。研究结果表明:深大基坑事故的发生与参与耦合的子系统影响因素成正比,三子系统耦合风险值最大;基坑-水文地质环境耦合风险值最为显著,而基坑-周边环境耦合风险值相对较低。因此,在深大基坑施工过程中,须特别关注基坑自身与水文地质环境之间的相互作用,采取相应的预防措施和安全管理策略,保证系统整体的安全性。

In order to solve the problem that the accident mechanism of deep and large foundation pit construction system is unclear and the risk factors are diverse and complex,the systematic characteristics of deep and large foundation pit construction risk are analyzed from the perspective of system.Based on the concept of complex system,the concept framework of deep and large foundation pit construction complex system is constructed,which is composed of foundation pit subsystem,hydrogeological subsystem and surrounding environment subsystem.The N-K model is used to quantitatively analyze the coupling effect between subsystems and the overall risk of the complex system of deep and large foundation pits.The results show that the occurrence of deep foundation pit accidents is proportional to the influencing factors of the subsystems involved in the coupling,and the coupling risk value of the three subsystems is the largest.The coupling risk value of foundation pit-hydrogeological environment is the most significant,while the coupling risk value of foundation pit-surrounding environment is relatively low.Therefore,in the process of foundation pit construction,special attention should be paid to the interaction between deep foundation pit itself and hydrogeological environment,and corresponding preventive measures and safety management strategies should be taken to ensure the overall safety of the system.