理論研究 2024年 第53卷 第21期
DOI: 10. 7672 / sgjs2024210078
隧道施工引起的既有地鐵線變形控制研究
牛自強
作者簡介：
牛自強，高級工程師，E?mail:16609317888@ 163. com作者單位：
中鐵十二局集團有限公司，山西太原 030024摘要：
依托某市新建地鐵 3 號線盾構隧道工程，通過數值模擬計算，基于土艙壓力和注漿壓力，研究新建盾構隧道下穿施工對既有地鐵 5 號線隧道結構變形的影響，并提出變形控制措施。研究結果表明，當地鐵 3 號線隧道左線盾構機到達既有地鐵隧道正下方區域和右線盾構機掘進完成時，隨著壓力比的增大，既有地鐵 5 號線隧道拱頂豎向位移分別逐漸增大和逐漸減小，而隨著注漿壓力的增大，既有地鐵 5 號線隧道拱頂豎向位移均基本減小。宜將土艙壓力控制為 1. 0 —— 1. 2 倍靜止土壓力，注漿壓力控制為 0. 64 —— 1. 00MPa.從施工成本和加固效果角度考慮，宜將二次深孔注漿作為合理的加固方式。
English：
Based on the shield tunnel project of a newly built Subway Line 3 in a certain city, numericalsimulation calculations were conducted to study the impact of the construction of the new shield tunnelunderpass on the structural deformation of the existing Subway Line 5 tunnel, based on soil chamberpressure and grouting pressure, and deformation control measures were proposed. The research resultsshow that when the left line shield machine of Subway Line 3 tunnel reaches the area directly below theexisting subway tunnel and the right line shield machine completes excavation, the vertical displacementof the existing Subway Line 5 tunnel arch gradually in creases and decreases with the increase of pressureratios, however,with the increase of grouting pressure, the vertical displacement of the existing SubwayLine 5 tunnel arch is basically reduced. It is advisable to control the soil chamber pressure at 1. 0 —— 1. 2times the static soil pressure, and the grouting pressure at 0. 64 —— 1. 00MPa. From the perspective ofconstruction cost and reinforcement effect, the secondary deep hole grouting reinforcement method shouldbe considered as a reasonable reinforcement method.