摘要
为了分析富水程度及饱水时间对隧道掌子面稳定的影响,建议非饱和围岩强度参数是围岩含水量或者饱和度的函数;饱和围岩强度参数是围岩饱水时间的函数。如受实验及经费限制,则可根据围岩软化系数以及Hoek-Brown准则,确定围岩不同饱和度下的围岩强度参数。进而提出基于强度折减法和上限法分析矿山法隧道掌子面稳定的思路,并给出相应的算例。研究结果表明:随着饱水时间的增长和饱和度的增加,掌子面安全系数降低;采用台阶法能够显著提高掌子面的稳定性。
In order to analyze the influence of water content and saturation time on the stability of tunnel face,for unsaturated surrounding rock,the strength parameter of surrounding rock is suggested to be the function of the water content or saturation of surrounding rock;for saturated surrounding rock,the strength parameter of surrounding rock is the function of the time of water saturation of the surrounding rock;and the form of the function is proposed to be the constant coefficient plus negative exponential function.If it is limited by experiments and funds,the strength parameters of surrounding rocks can be estimated by the Hoek-Brown criterion.Then the stability of the tunnel face is analyzed based on the upper bound method combined with the strength reduction method,and the application cases are presented.The results show that:with the increase of saturation,the safety factor of the tunnel face is reduced;in low water content,with the increase of water content,the gradient of the stability factor of the tunnel face is reduced steeply;with the increase of saturation time,the safety factor of tunnel face is reduced;the stability of the tunnel face is significantly improved by the bench excavation method.
作者
安永林
曾贤臣
赵丹
岳健
胡文轩
欧阳鹏博
AN Yonglin;ZENG Xianchen;ZHAO Dan;YUE Jian;HU Wenxuan;OUYANG Pengbo(Hunan Provincial Key Laboratory of Geotechnical Engineering for Stability Control and Health Monitoring,Hunan University of Science and Technology,Xiangtan 411201,China;School of Civil Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Changsha Metro Group Co.,Ltd,Changsha 410000,China)
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2019年第5期1261-1266,共6页
Journal of Railway Science and Engineering
基金
国家自然科学基金资助项目(51408216,51308209)
关键词
隧道工程
掌子面稳定
富水隧道
极限分析法
强度折减法
tunnel engineering
face stability
rich water tunnel
limit analysis method
strength reduced method
