(1. 中南大學 有色金屬成礦預測教育部重點實驗室，長沙 410083；
2. 中南大學 地球科學與信息物理學院，長沙 410083；3. 安徽省電力設計院，合肥 230601)
摘 要: 管幕預筑法豎井設計在國內(nèi)尚無相應規(guī)范，施工過程中其支護結構與周圍土體的變形受力特性與安全性尚需進行研究。以某管幕預筑法地鐵車站工程為例，利用有限差分軟件FLAC3D對其豎井施工過程進行數(shù)值模擬，并結合施工監(jiān)測數(shù)據(jù)進行對比分析，得到豎井支護結構及周邊土體的位移與支撐軸力隨施工過程的變化規(guī)律和特征。研究結果表明：管幕預筑法豎井施工過程對周邊土體的變形影響較小，反映豎井新型支護結構的變形控制效果很好；頂管對各部分支護結構及周邊土體的影響規(guī)律各不相同，主要體現(xiàn)在頂進過程中具有明顯的時間性。
關鍵字: 管幕預筑法；豎井；頂管；數(shù)值模擬
pipe jacking by pipe-roof pre-construction method
（1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals, Ministry of Education,
Central South University, Changsha 410083, China;
2. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;
3. Anhui Electric Power Design Institute, Hefei 230601, China）
Abstract:Pipe-roof pre-construction method (PPM) is a new construction method of substructure, its design codes is unavailable. The deformation and stress characteristics of retaining structure and surrounding soil need to be studied. Taken a metro station project constructed by PPM for example, FLAC3D was used to simulate the whole process which includes excavation, applying internal bracing and pipe jacking, the simulation results were comparatively analyzed with the construction monitoring data. The variation characteristics in deformation and bracing stress of retaining structure and surrounding soil were obtained. The results show that the deformation of the retaining structure and the surrounding soil is small during construction process, which indicates that the control effect of deformation is notable. The effects of pipe jacking process on retaining structure and surrounding soil are different with jacking process and layers, having obvious time-related characteristics.
Key words: pipe-roof pre-construction method; working well; pipe jacking; numerical simulation
