关键词: 浅埋隧洞, 近接施工, 变形控制, 施工过程反馈, 动态设计优化, 滇中引水工程

Abstract: Controlling the influence of shallow-buried tunnel construction has always been a challenge for large-scale water diversion project while passing through or near urban area. A dynamic closed-loop feedback-control method for the whole construction process is proposed. The method includes analysing construction conditions, comparing and selecting construction method, determining design scheme, construction process feedback, and dynamic design optimization. In analysing construction conditions, engineering geological condition and cross relations of buildings as well as other necessary influencing factors should be considered as a whole. Construction method should be determined comprehensively by technical and economic comparison. Deformation prediction and deformation control standard are crucial parts of design scheme. Multi-source information feedback and dynamic design optimization are keys to the influence control of adjacent construction. Passing through over 100 sensitive buildings and other structures, the shallow-buried segment of Central Yunnan Water Diversion Project crossing the urban area of Kunming is featured with extremely complex construction environment. The influence of its construction adjacent to the urban area can be under control in general by using the proposed dynamic closed-loop feedback-control method.

Key words: shallow-buried tunnel, adjacent construction, deformation control, feedback in construction process, dynamic design optimization, Central Yunnan Water Diversion Project