中文摘要：

城市隧道下穿时，普遍存在着地表房屋变形超限、倾斜开裂等安全风险问题，而且当前针对房屋变形开裂的计算分析、风险评估研究，也严重滞后于实际工程的需要。通过综合分析、比选，以及单、三轴试验验证表明：DSC（disturbed state concept）本构模型能够较好地描述材料开裂后力学行为；采用该模型并结合厦门机场路隧道下穿建筑群的工程实践，对地表建筑群开裂进行定量评估，评估结果与现场房屋裂缝监测、变形监测结果一致性良好。同时，对照扰动变量与实际房屋开裂的对应关系，发现扰动变量可以作为房屋开裂的定量安全指标，进一步即可以建立房屋变形开裂的过程控制标准，从而使隧道下穿过程中每个关键施工部、每个时段，地表房屋变形开裂程度、开裂风险都可以进行量化评估。

英文摘要：

House cracking and over-deforming are common risks when tunnel crossing urban territory; and relative studies of house cracking calculation and its risk evaluation lag far behind engineering need. By comparison and analysis, it is verified by uniaxial and triaxial compression tests that disturbed state concept （DSC） can give good description of material behavior after cracking, and combining this model with the practice of Xiamen airport road tunnel undercrossing building blocks, houses＇ deforming and cracking will be quantitatively calculated and evaluated; and the results have good accordance with in-situ house cracks and deformation monitored data. Meanwhile, it still shows close correlation between DSC disturbed factor and house cracking, thereby from mechanics, it is effective and reasonable to depict house cracking by using disturbed factor. Furthermore, process control criteria of house deforming and cracking can be set up by DSC model. Finally, in each key step and stage of tunnel undercrossing building blocks, house deforming and cracking risks can have criteria to go by and be process-evaluated and controlled well.