摘要
在断层破碎带中进行隧道开挖,当山岭地下水位较高时,将面临突涌水的风险,所以有必要进行该复杂环境下隧道涌水量的预测与分析。以隧道与断层的空间等效关系为基础,从渗流影响范围的角度提出断层影响宽度的不同解读。基于非达西修正和叠加原理,推导双洞隧道在断层不同区域的涌水量预测公式,并与经过断层的某双洞隧道的实测水量对比,验证该公式在双洞隧道遭遇断层带时进行涌水量预测的适用性。研究结果表明:双洞隧道的渗流量同时受旁洞和断层的影响,其中,左右洞的相互影响会减少单洞的涌水量,而断层则会加大涌水量;当断面内2倍隧道与断层的水平距离a大于半无限含水地层中渗流影响半径R时,断层作为地下水补给边界的影响可以忽略,而当a越小,断层促进渗流的影响会逐渐加大,当隧道直接揭露断层破碎区时涌水量达到最大。本文计算结果与分析结果可为后续隧道涌水计算与控制提供指导。
Tunnel excavation in fault fracture zone will face the risk of water inrush when the mountain groundwater level is high.Therefore,it is necessary to predict and analyze the water inflow of tunnel under this complex environment.Based on the spatial equivalent relationship between tunnel and fault,this paper put forward different interpretations of fault influence width from the perspective of seepage influence range.Based on the principle of non-Darcy correction and superposition,the prediction formulas of water inflow of double tunnel in different fault areas were deduced.By comparing with the measured water volume of a practical double tunnel passing through fault layer,the applicability of the formula in predicting water in flowed when double tunnel encounter’s fault zone was verified.It is found that the seepage flow of double tunnel is affected by side tunnel and fault at the same time.The interaction between adjacent tunnels will reduce the water inflow of single tunnel,while the fault act on the contrary.When twice the horizontal distance a between the tunnel and the fault in one section is greater than the seepage influence radius R,the influence of the fault as the groundwater recharge boundary can be ignored.When a is smaller,the influence will gradually increase.When the tunnel directly exposes the fault fracture area,the water inflow reaches the maximum.The results of calculation and analysis can provide guidance for the subsequent calculation and control of tunnel water inflow.
作者
阮志刚
刘宁
RUAN Zhigang;LIU Ning(Sichuan Vocational and Technical College of Communications,Chengdu 611130,China;College of Civil Engineering,Guizhou University,Guiyang 550025,China)
出处
《铁道科学与工程学报》
EI
CAS
CSCD
北大核心
2022年第7期1977-1984,共8页
Journal of Railway Science and Engineering
基金
2020年度贵州省科技支撑计划项目(黔科合支撑[2020]2Y036)。
关键词
双洞隧道
断层影响带宽度
非达西修正
叠加原理
涌水量预测
double-hole tunnel
influence width of fault
non-Darcy correction
superposition principle
water inflow prediction
作者简介
通信作者:阮志刚(1978−),男,浙江台州人,副教授,从事隧道与桥梁工程研究,E−mail:ruanbb@163.com。
