STUDY OF MECHANISM AND PREDICTION OF GROUTING UPLIFT IN TUNNEL CONSTRUCTION UNDERCROSSING BUILDINGS
HOU Yanjuan1,2,ZHANG Dingli2,CHEN Fengbin2
(1. State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China;
2. Key Laboratory of Urban Underground Engineering of Ministry of Education,Beijing Jiaotong University,Beijing 100044,China)
Abstract:Based on the analysis of settlement recovery characteristics of buildings,grouting uplift mechanism is analyzed in detail,consisting of four phases,i.e. ground fill and compaction,construction of exterior isolation curtain structure,formation of uplift force and building structure uplift. The key techniques of steady uplift of buildings are then summarized. The grouting uplift during tunnel construction undercrossing experimental buildings #104 and #105 is predicted by numerical simulation. The results indicate that the maximum uplift is 2.1–3.7 mm. It is also shown that uplift force and stiffness of exterior isolation curtain will influence the uplift effect significantly;and proper increments of these two factors are favorable to some degree. For comparison,the field test is introduced,showing a repeated process of soil fracturing,filling and fracturing again. Obvious uplift of the buildings begins when grouting pressure reaches 0.7–1.0 MPa,and the single maximum uplift is 2.2–3.1 mm,which is nearly close to the simulation result. All conclusions are helpful for improving the scientific understanding of safety control of urban tunnel construction and providing references for similar projects.
侯艳娟1,2,张顶立2,陈峰宾2. 隧道施工下穿建筑物注浆抬升机制及预测研究[J]. 岩石力学与工程学报, 2011, 30(12): 2407-2415.
HOU Yanjuan1,2,ZHANG Dingli2,CHEN Fengbin2. STUDY OF MECHANISM AND PREDICTION OF GROUTING UPLIFT IN TUNNEL CONSTRUCTION UNDERCROSSING BUILDINGS. , 2011, 30(12): 2407-2415.
蔡 军. 隧道穿越建筑物过程中注浆抬升技术研究[硕士学位论文][D]. 北京:北京交通大学,2010.(CAI Jun. Research on grouting uplift technology in the process of tunnel undercrossing the buildings[M. S. Thesis][D]. Beijing:Beijing Jiaotong University,2010.(in Chinese))
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