分岔隧道施工对上覆建筑变形影响的评估方法与应用

• 作 者: 李科 方林
• 机 构: 公路隧道建设技术国家工程实验室,隧道建设与养护技术交通行业重点实验室,招商局重庆交通科研设计院有限公司,
• 出 处: 防灾减灾工程学报
• 发表日期: 2016年05期
• 关键词: 隧道施工 数值分析 建筑基础 评估方法 基础沉降 数值模拟法 隧道仰拱 隧道开挖 工程实例分析 国外标准

针对分岔隧道下穿建筑问题,分析了房屋建筑规范标准、采煤行业标准、轨道交通经验标准以及国外标准与研究成果,提出以房屋建筑国家规范规定的建筑基础沉降与倾斜为控制指标,考虑隧道施工引起的变形增量与建筑既有变形量的总和;在变形标准确定后,提出了评估方法,首先采用Peck公式进行无建筑物时的初步判定,变形不满足规范要求时,采用刚度修正法或数值模拟法;然后利用该评估方法进行工程实例分析,结果表明,分岔隧道最大跨分岔断面隧道仰拱拉应力最大,断面上方基础沉降增量最大,仅考虑隧道施工引起的变形增量时,建筑变形满足要求,考虑建筑既有变形后则不满足规范要求,评估分析必须考虑建筑的既有变形。

Aiming at the problems of under-penetrating buildings in bifurcated tunnels, the standards of housing construction standards, coal industry standards, rail transit experience standards as well as foreign standards and research results are analyzed. The settlement and inclination of building foundations under the national code of building construction are taken as control indexes. After the deformation criterion was determined, an evaluation method was proposed. First, Peck’s formula was used to make preliminary judgment without building. When the deformation did not meet the requirements of the specification, the stiffness correction The results show that the maximum stress of the tunnel in the bifurcation tunnel with the largest cross-bifurcation cross-section is the highest, and the incremental settlement of the foundation above the section is the largest. Only the deformation caused by the tunnel construction is increased When the amount of deformation, building deformation to meet the requirements, considering the existing deformation of the building does not meet the requirements of the norms, assessment analysis must consider the building’s existing deformation.