岩溶槽谷区多条隧道条件下拟建隧道对岩体渗流场的影响
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摘要
依据重庆南山地勘资料,通过Midas GTS NX三维数值模拟,研究岩溶槽谷区既有多条隧道条件下拟建隧道施工(不考虑和考虑防水措施)时的区域渗流特征,预测拟建隧道的涌水量,并与现有涌水量理论计算值进行对比分析。结果表明,地下水径流模数法计算结果(单位长度涌水量10.10 m3/(d·m))与大气降水渗入量法计算结果(11.11 m3/(d·m))相近,也与数值模拟计算结果(11.50 m3/(d·m))接近。受拟建隧道开挖影响,铜锣山隧道单洞涌水量下降了2.4%;南山隧道左洞下降了6.9%,右洞下降了4.7%。南山隧道左洞涌水量受拟建隧道影响最大,右洞次之,铜锣山隧道最小。拟建隧道及时施做防水及二次衬砌时,拟建隧道左洞涌水量下降了66.3%,右洞下降了66.2%,效果显著。在岩溶槽谷区既有多条隧道条件下,拟建隧道开挖对一定范围内既有隧道涌水量及渗流特征影响不大,对埋深较深的隧道影响更小。
Based on the numerical simulation of Nanshan geological survey in Nanshan,this paper studied the regional seepage characteristics of tunnels under the condition of tunnel construction(with and without waterproofing measures) in the karst trough area,forecasted the proposed tunnel and compared with the calculated value of the existing gushing water,the reason of the gap was discussed. The results show that the calculated results of groundwater runoff modulus(unit water inflow 10. 10 m3/(d·m)) are similar to those of atmospheric precipitation(11. 11 m3/(d·m)),and are close to the numerical simulation results(11. 50 m3/(d·m)). Under the influence of tunnel excavation,the water discharge of Tongluoshan tunnel decreased by 2. 4%; the left hole of Nanshan tunnel dropped by 6. 9%,the right hole dropped by 4. 7%. The impact of proposed tunnel on the water volum is the greatest to the left hole,midum to the right hole and the samllest to the Tongluoshan tunnel. When the proposed tunnel is constructed in time for waterproofing and secondarylining,the waterfall of the left tunnel of the proposed tunnel is reduced by 66. 3% and the right hole is reduced by 66. 2%. In the karst trough area,there are many tunneling conditions. The proposed tunnel excavation has little effect on water inflow and seepage characteristics of the existing tunnels in a certain range,and has less influence on the deep tunnel.
Based on the numerical simulation of Nanshan geological survey in Nanshan,this paper studied the regional seepage characteristics of tunnels under the condition of tunnel construction(with and without waterproofing measures) in the karst trough area,forecasted the proposed tunnel and compared with the calculated value of the existing gushing water,the reason of the gap was discussed. The results show that the calculated results of groundwater runoff modulus(unit water inflow 10. 10 m3/(d·m)) are similar to those of atmospheric precipitation(11. 11 m3/(d·m)),and are close to the numerical simulation results(11. 50 m3/(d·m)). Under the influence of tunnel excavation,the water discharge of Tongluoshan tunnel decreased by 2. 4%; the left hole of Nanshan tunnel dropped by 6. 9%,the right hole dropped by 4. 7%. The impact of proposed tunnel on the water volum is the greatest to the left hole,midum to the right hole and the samllest to the Tongluoshan tunnel. When the proposed tunnel is constructed in time for waterproofing and secondarylining,the waterfall of the left tunnel of the proposed tunnel is reduced by 66. 3% and the right hole is reduced by 66. 2%. In the karst trough area,there are many tunneling conditions. The proposed tunnel excavation has little effect on water inflow and seepage characteristics of the existing tunnels in a certain range,and has less influence on the deep tunnel.
引文
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[9]Aalianvari,Ali,Katibeh,Homayoon,Sharifzadeh,Mostafa et al.Application of fuzzy Delphi AHP method for the estimation and classification of Ghomrud tunnel from groundwater flow hazard[J].Arabian Journal of Geosciences,2012,5(2):275-284.
[10]重庆南江地质工程勘察院.茶园新城区南山隧道及东西干道工程地质勘察报告[R].2005.Chongqing Nanjiang Geological Engineering Investigation Institute.Geological survey report of Nanshan Tunnel and East-West Road in New Town Area of Chayuan[R].2005.
[2]郭纯青,田西昭.岩溶隧道涌水量综合预测——以朱家岩岩溶隧道为例[J].水文地质工程地质,2011,38(3):1-8.GUO Chunqing,TIAN Xizhao.A comprehensive forecast of water inflow in karst tunnels:Exemplified by the Zhujiayan karst tunnel[J].Hydrogeology&Engineering Geology,2011,38(3):1-8.
[3]林传年,李利平,韩行瑞,等.复杂岩溶地区隧道涌水预测方法研究[J].岩石力学与工程学报,2008,27(7):1469-1476.LIN Chuannian,LI Liping,HAN Xingrui,et al.Research on forecast method of tunnel water inrush in complex karst areas[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(7):1469-1476.
[4]南力辉.双碑隧道涌水量预测及运营预警措施研究[D].成都:西南交通大学,2015:16-27.NAN Lihui.Study on forecasting and operational early-warning measures of water diversion in Shuangbei Tunnel[D].Chengdu:Southwest Jiaotong University,2001:16-27.
[5]JIN Xiaoguang,JIN Yujuan,TANG Haofeng,et al.Water inflow quantity evaluation and prediction for Cimushan Tunnel[C].//Advances in Industrial and Civil Engineering.Part 2.2012:1269-1274.
[6]魏兴萍,张虹,苏程烜,等.重庆南山隧道工程涌水隐患研究[J].中国岩溶,2016,35(1):74-80.WEI Xingping,ZHANG Hong,SU Chengxuan,et al.Hazard of water gushing caused by Nanshan Tunnel engineering,Chongqing[J].Carsologica Sinica,2016,35(1):74-80.
[7]N Coli,G Pranzini A Alfi,et al.Evaluation of rockmass permeability tensor and prediction of tunnel inflows by means of geostructural surveys and finite element seepage analysis[J].Engineering Geology,2008,101(3/4):174-184.
[8]H R Zarei,A Uromeihy,M Sharifzadeh,et al.A new tunnel inflow classification(TIC)system through sedimentary rock masses[J].Tunnelling and Underground Space Technology,2013,34(2):1-12.
[9]Aalianvari,Ali,Katibeh,Homayoon,Sharifzadeh,Mostafa et al.Application of fuzzy Delphi AHP method for the estimation and classification of Ghomrud tunnel from groundwater flow hazard[J].Arabian Journal of Geosciences,2012,5(2):275-284.
[10]重庆南江地质工程勘察院.茶园新城区南山隧道及东西干道工程地质勘察报告[R].2005.Chongqing Nanjiang Geological Engineering Investigation Institute.Geological survey report of Nanshan Tunnel and East-West Road in New Town Area of Chayuan[R].2005.
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