大直径盾构隧道下穿既有市政隧道稳定性分析  

Stability Analysis of Large-diameter Shield Tunneling Under Existing Municipal Tunnels

作　　者：董立 Dong Li(Guangzhou Urban Planning Survey and Design Research Institute Co.Ltd.,Guangzhou,Guangdong 510060)

机构地区：[1]广州市城市规划勘测设计研究院有限公司,广东广州510060

出　　处：《江西建材》2024年第6期186-188,共3页

摘　　要：为确保大直径盾构隧道下穿既有市政隧道施工的安全性,文中以云溪公园站-小金钟站区间近接金园路隧道施工为工程背景,以既有金园路隧道沉降监测成果为基础,通过尖点突变分析和变形预测开展近接施工过程中的稳定性综合分析。结果表明,通过尖点突变分析得出,金园路隧道构筑物沉降和拱底沉降的△值均大于0,说明既有隧道在现状条件下均具有较优的稳定性;通过变形预测分析得到,金园路隧道的后续沉降变形虽会增加,但增加速率趋于减小,说明近接既有隧道施工过程中的后续稳定性仍较好;通过对比,新建隧道施工对近接金园路隧道确有影响,但影响程度均在可控范围内,始终具有较好的稳定性。To ensure the safety of the construction of a large-diameter shield tunnel passing through an existing municipal tunnel,this article takes the construction of the nearby Jinyuan Road tunnel between Yunxi Park Station and Xiaojinzhong Station as the engineering background,and based on the settlement monitoring results of the existing Jinyuan Road tunnel,conducts a comprehensive analysis of the stability during the nearby construction process through sharp point mutation analysis and deformation prediction.The analysis results show that through the sharp point mutation analysis,it is found that the A values of the settlement of the Jinyuan Road tunnel structure and the settlement of the arch bottom are both greater than O,indicating that the existing tunnel has better stability under the current conditions;Meanwhile,through deformation prediction analysis,it was found that although the subsequent settlement deformation of the Jinyuan Road Tunnel will increase,the rate of in-crease tends to decrease,indicating that the subsequent stability during the construction process of the adjacent existing tunnel is still good.By comparison,the construction of new tunnels does have an impact on the nearby Jinyuan Road tunnel,but the degree of impact is within a con-trollable range and always has good stability.

关 键 词：盾构隧道 既有隧道 尖点突变分析 稳定性分析 

分 类 号：P642[天文地球—工程地质学]