摘要
隧道允许渗水量对地下水及结构影响较大,为确定其合理值,首先利用反映法将有界含水层用映射原理转化为无界问题,再基于线性系统叠加原理求解控制点水头势函数,进而利用环境限制条件计算渗水量极限值解析解,同时推导初期支护内外壁水头压力表达式,最后基于工程案例对理论公式进行验证并优化设计。研究结果表明:隧道允许渗水量与控制点周围介质渗透系数及水位允许降深的乘积成正比;降低注浆圈与初期支护渗透系数可减少隧道涌水量,但超过一定界限后隧道涌水量对两者渗透系数的敏感性均可忽略;注浆圈半径增大到一定程度后(本实例为6 m),环向盲管工作状态对二次衬砌外壁水压力影响急剧增大,须定期对环向盲管进行检查,避免水压力对防水板及二次衬砌造成较大破坏。
The allowable drainage of tunnel has great influence on groundwater and structure,in order to determine its reasonable value.First of all,the method of reflection was used to transform bounded problems into unbounded problems.Then,based on linear superposition principle to solve the potential function,the control point head and environmental constraints were used to calculate allowable drainage.The inside and outside wall head pressure expressionswere derived at the same time.Based on the engineering case,this theory formula and optimizing designwere verified.The results are as follow.The allowable drainage of tunnel is directly proportional to the permeability coefficient of rock around the control point and allowable drawdown of water level.Reducing the permeability coefficient of grouting ring and initial support can reduce tunnel water inflow,but the sensitivity of tunnel water inflow to both permeability coefficients can be ignored after exceeding a certain limit.When the radius of grouting circle is increased to a certain extent(6 m in this case),the influence of the working state of the circumferential blind pipe on the water pressure of the secondary lining will increase sharply.Therefore,it is necessary to check the circumferential blind pipe regularly to avoid the water pressure causing great damage to the waterproof board and the secondary lining.
作者
安鹏涛
傅鹤林
周先平
成国文
李鲒
余小辉
AN Pengtao;FU Helin;ZHOU Xianping;CHENG Guowen;LI Jie;YU Xiaohui(School of Civil Engineering,Central South University,Changsha 410075,China;Guangdong Nanyue Transportation Investment&Construction Co.,Ltd.,Guangzhou 510101,China)
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2021年第7期1808-1816,共9页
Journal of Railway Science and Engineering
基金
国家自然科学基金资助项目(51978668)
广东省交通科技计划资助项目(DFH(201904)YS1-001)。
关键词
反映法
叠加原理
势函数
渗水量
注浆圈
reflection method
superposition principle
potential function
seepage volumn
grouting ring
