新建隧道下穿既有运营地铁施工的力学机理  被引量:6

Mechanical mechanism of new metro tunnel passing under existing metro tunnel

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作  者:武科[1] 崔帅帅 张前进 于雅琳[1] 张乐文[2] WU Ke;CUI Shuaishuai;ZHANG Qianjin;YU Yalin;ZHANG Lewen(School of Civil Engineering,Shandong University,Jinan,Shandong 250061,China;Institute of Marine Science and Technology,Shandong University,Qingdao,Shandong 266237,China)

机构地区:[1]山东大学土建与水利学院,山东济南250061 [2]山东大学海洋研究院,山东青岛266237

出  处:《江苏大学学报(自然科学版)》2018年第5期596-603,共8页Journal of Jiangsu University:Natural Science Edition

基  金:山东省自然科学基金资助面上项目(ZR2017MEE051;ZR2017MEE032)

摘  要:依托某新建地铁隧道下穿既有运营地铁线,基于三维数值计算分析方法,与现场监测数据进行对比,验证了模拟的可靠性,研究了全断面法、上下台阶法和盾构法等3种地铁隧道施工方案对既有运营地铁结构的影响,进而提出了有效的变形控制措施.研究结果表明:相对于全断面法和上下台阶法,盾构法施工能够有效地降低地表和既有隧道结构的沉降,以及既有隧道管片的主应力,且沉降收敛所用时间短于全断面法和上下台阶法;通过采取有效的注浆加固措施,可以大幅度减小地表沉降、既有隧道的不均匀沉降和天然岩层的沉降;施工中,应结合实际情况,合理选取注浆加固区域,避免材料的浪费.For the new metro tunnel passing under the existing metro tunnel,based on the three-dimensional numerical analysis method,the field monitoring data was compared to verify the simulation reliability.The effects of three tunnel construction schemes of entire section method,benching tunneling construction method and shield method on existing metro structures were investigated,and the effective deformation control measures were proposed.The results show that compared with the entire section method and the benching tunneling construction method,the shield method can effectively reduce the earth surface and existing metro tunnel settlements and the principal stress of existing tunnel structure,and the convergence time of settlement is shorter than those of other two schemes.Through effective grouting reinforcement measures,the surface subsidence,the uneven settlement of existing metro tunnel and the settlement of natural rock formations can be drastically reduced.In the process of construction,the reasonable selection of grouting reinforcement area should be combined with the actual situation to avoid material waste.

关 键 词:地铁隧道 下穿工程 数值计算 监测数据 力学机理 

分 类 号:U455.4[建筑科学—桥梁与隧道工程]

 

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