基于城市地下工程建设中“地层－环境－工程扰动”的动态作用特点和典型安全事故的统计分析，指出城市地下工程安全事故发生的本质就是施工诱发的地层失稳和过大变形所致，控制地层变形是避免安全事故的根本所在；针对城市复杂地层的结构性特点，提出工程影响下的地层变形分别应从地层材料变形、细观结构层稳定性和环境诱发3个层面考虑，据此可对城市复杂地层变形作出更为科学的预测；针对城市地下工程高风险的特点，提出了建（构）筑物安全风险评估内容和安全风险控制工作程序，显著提升了城市地下工程建设安全控制水平。
Based on the dynamic characteristics of "ground-environment-construction disturbance" and the statistical analysis of typical safety accidents in the construction of urban underground engineering, this paper points out that the essence of safety accidents in urban underground engineering is the instability and deformation caused by construction, and that controlling ground deformation is the key to safety accident prevention. Considering the structural characteristics of the urban complex stratum, it is suggested that the ground deformation under the influence of the engineering should be considered from three aspects:deformation of ground material, stability of mesoscopic structural layer, and environment inducement. More scientific predictions for complex ground deformation can be made from these three aspects. This paper puts forward the contents of security risk assessment on buildings (structures) and a working procedure for safety risk control of urban underground engineering construction, significantly promoting the control level of construction.
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