摘要
针对新奥法在工程应用中的不足,分析了采用经典地压理论解决隧道工程支护问题的合理性与缺陷,提出了基于支护控制曲线、工程地质情况、监测数据的闭环式目标控制优化支护理论.通过有限元法分析不同应力释放率下支护结构应力与围岩变形的关系,利用支护应力与围岩变形控制条件确定目标控制位移,通过计算后续步段开挖对变形影响的修正控制位移,并结合实际工程的现场位移监测数据,最终确定合理的二次支护施作条件.通过工程实例,验证了该方法的正确性与实用性.
The new Austrian tunneling method （NATM） is widely used in tunnel construction. Aimed at the deficiency of the secondary support time in NATM, the defect of classical ground pressure theory was analyzed, and a circular target optimization theory of tunnel support was proposed based on support con- trol curve, engineering geology condition, and monitoring data. The support structure stress and sur- rounding rock deformation relation with different stress release rate were obtained by finite element method calculation. The target limited displacement was determined by considering support stress and surrounding rock deformation, and revised by the calculation of later excavation effect. The finial proper condition for secondary supporting was determined by considering the in-situ monitoring data. At last, this method was verified by engineering application.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2013年第9期1435-1440,1446,共7页
Journal of Shanghai Jiaotong University
基金
交通部西部交通建设科技项目(2009318000046)资助
关键词
隧道支护理论
围岩
变形
应力释放率
支护时间
tunnel supporting theory
surrounding rock
deformation
stress release rate
supporting time
