摘要
随着我国城市化进程的不断推进,地下空间的开发和利用越来越受重视,特别是盾构隧道已成为工程建设的重要技术手段。而城市地下环境日趋复杂,市政隧道下穿既有道路的项目愈发常见,研究与之对应的土体位移预测方法对地下空间安全评估至关重要。借助弹性力学中薄壁圆筒的平面模型,构建相应的边界条件,推导出适用于有重地层浅埋圆截面土体沉降变形的计算方法。以中国澳门纯钢纤维混凝土盾构隧道下穿友谊大马路工程为实例,并与不同收敛模式下随机介质理论进行对比验证。研究结果表明:理论公式与土体位移实测值吻合度较高,且略优于随机介质理论的计算结果。理论公式综合考虑了路基土体参数、隧道深径比及施工技术水平等因素的影响,计算结果合理可靠,可为盾构隧道下穿施工诱发土体位移预测提供重要的理论支持。
With the continuous urbanization in China,the development and utilization of underground space have attracted much attention,and shield tunnel has especially become a popular means of technical building.Due to the complex urban underground environment,municipal tunnels underpassing existing highways have been commonly observed.It is a vital issue for the safety evaluation of underground space to examine the prediction methods for the corresponding soil displacement.This work developed associated boundary conditions with the help of the plane model for thin-walled cylinders in elastic mechanics,and the determined the settlement and deformation calculation method for shallow buried circular cross-section soil with heavy stratum.The proposed technology was validated based on a shield tunnel project of pure steel fiber concrete that underpassed the You-Yi Avenida in Macao.The technology was also compared with stochastic medium theory with distinct convergence modes.Results reveal that the theoretical formulations are in good agreement with the measured soil displacements,and they are slightly better than the results of stochastic medium theory.The theoretical formulas comprehensively consider the influence of soil parameters,tunnel depth-to-diameter ratio,and construction level,and the calculation results are reasonable and reliable,which provides important theoretical support for the prediction of soil displacement induced by the construction of shield tunnels.
作者
张杰
马野
谢家化
林宇亮
ZHANG Jie;MA Ye;XIE Jiahua;LIN Yuliang(China Railway Tunnel Group Co.,Ltd,Guangzhou,Guangdong 511458;School of Civil Engineering,Central South University,Changsha,Hunan 410075;China Railway Liuyuan Group Co.,Ltd.,Tianjin 300308)
出处
《地质与勘探》
CAS
CSCD
北大核心
2024年第1期156-163,共8页
Geology and Exploration
基金
国家自然科学基金项目(编号:51878671、51678667)资助。
关键词
纯钢纤维混凝土管片
地表沉降
土体损失
安全评估
pure steel fiber concrete segment
ground surface settlement
ground loss
safety assessment
