盾构隧道穿越既有混凝土桥梁结构的风险控制指标

发布时间：2018-10-11 10:23

【摘要】：基于《公路桥梁承载能力检测评定规程》,确定桥梁承载能力计算参数;采用有限元法计算盾构隧道穿越既有混凝土桥梁结构时桥梁结构的剩余承载力和结构内力;选取桥梁结构的内力不大于剩余承载能力时的桥梁结构差异变形值,作为工程的最终风险控制指标;根据每个阶段控制步各监测控制点的变形规律,将最终风险控制指标分配给每个阶段控制步,得到工程的阶段风险控制指标。以地铁公主坟站—西钓鱼台站区间双洞盾构隧道穿越普惠桥工程为例进行仿真分析。结果表明:该工程的最终风险控制指标为中幅桥台竖向差异沉降不大于10.0mm;边幅桥台竖向差异沉降不大于5.0mm;桥台水平位移均不大于5.1mm;边幅桥台的差异变形越大,使得其各工况的内力相差较大;中幅及边幅桥台的变形随着隧道开挖面的接近及穿越南桥台逐渐增加,随着隧道开挖面离开北桥台逐渐减小;中幅桥台的竖向阶段风险控制指标明显高于边幅桥台的竖向风险控制指标,而二者水平向的阶段风险控制指标较为接近。
[Abstract]:Based on the rules for the Test and Evaluation of Highway Bridge bearing capacity, the calculation parameters of bridge bearing capacity are determined, and the residual bearing capacity and structural internal force of shield tunnel passing through existing concrete bridge structure are calculated by finite element method. When the internal force of the bridge structure is not greater than the residual bearing capacity, the differential deformation value of the bridge structure is selected as the ultimate risk control index of the project. The final risk control index is assigned to each stage control step, and the project stage risk control index is obtained. Taking the double-hole shield tunneling project between Gongzhu grave Station and XiDiaoyutai Station as an example, the simulation analysis is carried out. The results show that the ultimate risk control index of the project is that the vertical differential settlement of the middle abutment is not greater than 10.0mm, the vertical differential settlement of the side abutment is not greater than 5.0mm, the horizontal displacement of the abutment is not greater than 5.1mm, and the difference deformation of the side abutment is greater. The deformation of the middle and side abutment increases with the approach of tunnel deck and the crossing of south abutment, and decreases gradually with the opening of tunnel leaving the north abutment. The vertical risk control index of the middle abutment is obviously higher than the vertical risk control index of the side abutment, but the horizontal risk control index of both is close.
【作者单位】：北京交通大学隧道及地下工程教育部工程研究中心;北京市轨道交通建设管理有限公司;中国新兴保信建设总公司;
【基金】：国家自然科学基金资助项目(50778012) 北京市轨道交通建设管理有限公司科研试验项目(地铁十(二)线科技字第2013A173号)
【分类号】：U455.43;U441.7

【相似文献】