小间距隧道围岩变形控制条件及其工程应用
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摘要
为了探讨小间距隧道围岩的变形稳定性,进行稳定安全的净距设计,基于地下洞室围岩的容许变形规定或规范,以及大量的现场监测信息和变形规律数值模拟结果,利用统计学方法,对围岩为石灰岩和千枚岩的小间距隧道建立了容许变形控制方程,该方程综合考虑了小间距隧道跨度、间距大小、埋深、围岩变形规律及强度特性等影响因素。依据该方程对围岩为石灰岩和千枚岩的小间距隧道工程的稳定安全性进行了检验分析,并与现场实测位移进行了比较分析,其可用于中硬岩和硬岩小间距隧道围岩周边水平容许位移和拱顶垂直容许下沉位移的计算。
In order to discuss the deformation stability of surrounding rock for small interval tunnels and carry out the stable safe distance design,the controlling equations(conditions) of the allowable deformation of limestone and phyllite around small interval tunnels are established by the statistical methods according to the allowable deformation and criterion of surrounding rock of underground caverns,and the in-situ monitoring deformation informations and numerical simulation results.The width,spacing size,depth,deformation laws and strength properties of small interval tunnels are considered in the equations.Using the equations the deformation stability is checked and analyzed for limestone and phyllite around small interval tunnels,and the allowable convergence displacements are compared with in-situ monitoring results,and their adaptabilities are proved.The established formulas can be used for calculating the horizontal allowable displacement at sidewall and the vertical allowable displacement at vault for hard and middle-hard rock round the small interval tunnels.
In order to discuss the deformation stability of surrounding rock for small interval tunnels and carry out the stable safe distance design,the controlling equations(conditions) of the allowable deformation of limestone and phyllite around small interval tunnels are established by the statistical methods according to the allowable deformation and criterion of surrounding rock of underground caverns,and the in-situ monitoring deformation informations and numerical simulation results.The width,spacing size,depth,deformation laws and strength properties of small interval tunnels are considered in the equations.Using the equations the deformation stability is checked and analyzed for limestone and phyllite around small interval tunnels,and the allowable convergence displacements are compared with in-situ monitoring results,and their adaptabilities are proved.The established formulas can be used for calculating the horizontal allowable displacement at sidewall and the vertical allowable displacement at vault for hard and middle-hard rock round the small interval tunnels.
引文
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[2]郑颖人,沈珠江,龚晓南.岩土塑性力学原理[M].北京:中国建筑工业出版社,2002.
[3]于学馥,郑颖人,刘怀恒,方正昌.地下工程围岩稳定分析[M].北京:煤炭工业出版社,1983.
[4]陈卫兵,郑颖人,冯夏庭,等.考虑岩土体流变特性的强度折减法研究[J].岩土力学,2008,29(1):101-105.
[5]刘胜利,施成华,彭立敏,等.小间距隧道施工期间隧道与结构的稳定性评判[J].西部探矿工程,2003,(3):108-111.
[6]夏才初,潘国荣.土木工程监测与技术[M].北京:中国建筑工业出版社,2002.
[7]王梦恕.地下工程浅埋暗挖技术通论[M].合肥:安徽教育出版社,2004.
[8]JTG D70-2004公路隧道设计规范[S].
[9]汪荣鑫.数理统计[M].西安:西安交通大学出版社,1986.
[10]李云鹏,韩常领.小间距隧道设计与施工研究项目报告[R].2008.
[11]铁道部第二勘测设计院.铁路工程设计技术手册:隧道[M].北京.中国铁道出版社,1995.
[12]GB 50086-2001锚喷支护设计施工和验收规范[S].
[13]李云鹏,王芝银,韩常领,等.柞小公路隧道爆破地震波现场监测与分析研究[J].现代隧道技术,2008,45(3):29-35.
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