摘要
为了研究开挖方法对围岩形变压力的影响,采用理论分析、文献调研及现场测试方法明确了其对围岩形变压力的影响规律;根据相应变化规律,基于多元非线性回归方法,考虑围岩级别、隧道跨度及隧道开挖方法因素建立了围岩形变压力定量计算公式;对54座隧道的205个实测形变压力断面数据(108个大型机械化配套大断面开挖施工监测断面、97个常规分部开挖施工监测断面)进行分析.结果表明:采用大型机械化大断面开挖方法,隧道开挖后围岩稳定,所产生的围岩形变压力小;采用常规机械化分部法开挖方法,所产生的围岩形变压力大;围岩形变压力计算公式中开挖方法影响系数kc的取值范围为1.00~1.15,且围岩级别越大,kc取值越大,开挖方法对围岩所产生形变压力的影响越明显.
In order to study the influence of the excavation method on the deformation load of the surrounding rock,the law of its influence on the deformation load was clarified through theoretical analysis,literature research and field test methods.Considering the influence of surrounding rock grade,tunnel span and excavation method,a quantitative calculation formula for deformation load was established according to the corresponding change law based on the multiple nonlinear regression method.Through the analysis of the deformation load data of 205 monitoring sections in 54 tunnels(108 monitoring sections of large-scale excavation mechanized construction and 97 conventional partial excavation construction monitoring sections).The results show that the surrounding rock after tunnel excavation is stable and the deformation load of surrounding rock is small by adopting large-scale mechanized large-section excavation method.The deformation load of surrounding rock is large when the conventional mechanized subsection excavation method is adopted.In the calculation formula of deformation load of surrounding rock,the value of excavation method influence coefficient kc ranges from 1.00 to 1.15,the higher the grade of surrounding rock,the greater the kc value,that is,the worse the surrounding rock,the more obvious the influence of excavation methods on the deformation load of surrounding rock.
作者
王明年
王志龙
桂登斌
张霄
赵思光
童建军
刘大刚
WANG Mingnian;WANG Zhilong;GUI Dengbin;ZHANG Xiao;ZHAO Siguang;TONG Jianjun;LIU Dagang(Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotoug University,Chengdu 610031,China;School of Civil Engineering,Southwest Jiaotoug University,Chengdu 610031,China)
出处
《西南交通大学学报》
EI
CSCD
北大核心
2021年第5期1116-1124,共9页
Journal of Southwest Jiaotong University
基金
国家自然科学基金(51878567)。
关键词
隧道开挖方法
深埋隧道
形变压力
现场实测
excavation method
deep buried tunnel
deformation load
field measurement
