地下空间下穿建（构）筑物扰动机制与控制技术

为解决下穿运营线、建（构）筑物的工程安全风险控制问题，分析地下空间下穿工程的现状及面临的挑战，研究基于“动态平衡”的地下空间下穿机制，给出安全控制技术，并提出未来技术发展的方向建议。结论如下： 1）地下空间下穿是既有工程、地层、下穿工程扰动与平衡的动态过程； 2）扰动与控制过程分析是下穿机制研究的重点； 3）安全下穿以稳定性为目标，针对既有结构、地层介质、支护结构、动态管控等方面强化控制措施； 4）可从地质条件、覆跨比、周边环境及沉降控制要求等因素综合考虑下穿工程工法； 5）可通过加固及托换、地层改良固结、隔离和支护等技术，有效提高既有结构、地层及支护结构的安全控制能力。

Disturbance Mechanism and Control Technology of Underground SpaceCrossing underneath Buildings (Structures)

To effectively control the safety risks of engineering in crossing underneath operation lines and buildings (structures), the current situation and the challenges of underpass engineering in underground space are analyzed. In addition, the underpass mechanism of underground space is studied based on "dynamic balance," the safety control technology is evaluated, and the direction of future technological developments is suggested. Based on the results, the conclusions are as follows: (1) The undercrossing of underground space is a dynamic process of disturbance and balance among existing buildings (structures), strata, and undercrossing engineering. (2) The analysis of disturbance and control processes is the focus of undercrossing mechanism research. (3) Stability is the target of safe underpasses, and control measures are improved based on existing structures, stratum media, support structures, and dynamic control. (4) Underpass engineering methods can be considered based on factors such as geological conditions, coverage span ratio, surrounding environment, and settlement control requirements. (5) The safety control capacity of existing structures, strata, and supporting structures can be effectively improved via reinforcement and underpinning, stratum improvement and consolidation, isolation, and support.