摘要
将水平条分法引入小净距隧道计算中,对岩土体的黏聚力与内摩擦角作为独立因素考虑,通过公式推导准确得出先、后行洞内侧破裂面交点位置,进而推导出静力工况下浅埋小净距隧道围岩压力的解析解.将结果与规范计算值和工程实测值进行对比分析,验证本研究推导公式的准确性.结果表明,与规范法相比,本方法在理论上更为合理,也更符合工程实际,能更准确地计算隧道围岩压力.当隧道净距大于1.0倍且小于1.5倍单洞开挖跨度时,推导得出的小净距隧道围岩压力计算公式结果较为精确,且适用范围更广.小净距隧道先行洞和后行洞的围岩压力分布具有一定规律,后行洞内侧竖向围岩压力大于先行洞,水平侧压力小于先行洞.同时,单一隧道内侧竖向围岩压力大于外侧,外侧水平侧压力大于内侧.
In this paper,the horizontal slice method is introduced into the calculation of small clear distance tunnel,and the cohesion of rock and soil and the angle of internal friction are considered as independent factors.Through the derivation of the formula,the position of the intersection point of the inner fracture surface of the tunnel can be accurately obtained,and then the analytical solution of the surrounding rock pressure of the shallow buried small clear distance tunnel under static conditions can be derived.The results are compared with the calculated values according to specifications and engineering measured values to verify the accuracy of the formula derived in this paper.The results show that compared with the standard method,this research method is more reasonable in theory,more in line with the engineering practice,and can calculate the surrounding rock pressure of tunnel more accurately.When the clear distance of the tunnel is between 1.0 and 1.5 times the excavation span of a single bore,the formula for calculating the surrounding rock pressure in tunnels with a small clear distance,as presented in this paper,proves to be more precise and widely applicable.The surrounding rock pressure distribution of the leading tunnel and the trailing tunnel with small clear distance has certain regularity.The vertical surrounding rock pressure inside the trailing tunnel is greater than that of the leading tunnel,and the horizontal side pressure is less than that of the leading tunnel.At the same time,the vertical surrounding rock pressure inside a single tunnel is greater than that outside,and the horizontal pressure outside is greater than that inside.
作者
魏雯
邓涛
林歆韬
张森华
WEI Wen;DENG Tao;LIN Xintao;ZHANG Senhua(College of Civil Engineering,Fuzhou University,Fuzhou,Fujian 350108,China)
出处
《福州大学学报（自然科学版）》
CAS
北大核心
2024年第6期731-739,共9页
Journal of Fuzhou University(Natural Science Edition)
基金
国家自然科学基金资助项目(52278399)。
关键词
隧道工程
小净距隧道
围岩压力
条分法
浅埋
tunnel engineering
small-spacing tunnels
surrounding rock pressure
slice method
shallow cover
