关键词: 管幕结构法, 侧穿雨棚柱, 沉降控制标准, 数值分析, 沉降特征

Abstract: The Yingze Underpass Tunnel in Taiyuan City was excavated by using perforated pipe jacking and grouting method. It had the characteristics of large span, shallow embedment depth and restrictive settlement control. The construction process such as, steel pipe jacking, cutting, concrete pouring and earthwork excavation, were numerically simulated. The settlement of the adjacent pile supported canopy station induced by the tunnel excavation was also evaluated. The allowable settlement value for the canopy structure was recommended. The following conclusions can be obtained: 1) during the tunnel excavation using perorated pipe jacking and grouting method, the adjacent pile supported canopy station structure was adversely affected since both vertical and horizontal deflections were observed. 2) The horizontal deflections at the canopy structure were mainly occurred during the pipe jacking and cutting stages. The earthwork stage had a relatively small impact on the horizontal deflection of the canopy structure. 3) After the construction, the maximum horizontal deflection at the canopy foundation level was 1.18 mm and the maximum vertical settlement was 4.59 mm and both values met the allowable settlement requirements.

Key words: Perforated Pipe Jacking and Grouting Method, Adjacent Canopy Structure, Control Allowable Settlement Value, Numerical Analysis, Settlement Patterns