基于现场监测及数值分析的隧道双导洞超前施工优化研究  

Optimization study of advanced double-drift tunnel construction based on on-site monitoring and numerical analysis

作　　者：宋战平[1,2] 张强 赵克明 张学钢 张学文[2] 王娟娟[1] SONG Zhanping;ZHANG Qiang;ZHAO Keming;ZHANG Xuegang;ZHANG Xuewen;WANG Juanjuan(School of Civil Engineering,Xi′an Univ.of Arch.&Tech.,Xi′an 710055,China;China Railway Construction Bridge Engineering Bureau Group Co.,Ltd.,Tianjin 300300,China;Shaanxi Railway Institute,Weinan 714099,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]中国铁建大桥工程局集团有限公司,天津300300 [3]陕西铁路工程职业技术学院,陕西渭南714099

出　　处：《西安建筑科技大学学报（自然科学版）》2018年第5期654-661,共8页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学基金项目(51578447);住房和城乡建设部科学技术计划项目(2017-K4-032);渭南市科技计划基金项目(2015KYJ-3-1)。

摘　　要：依托新建兰渝高铁桃树坪富水弱胶结粉细砂隧道工程,基于现场监测和数值模拟分析相结合的方法,对大断面富水砂地层条件下的隧道施工方案进行了优化和分析,研究了大断面隧道CRD法、双侧壁导坑法和三台阶七步法三种施工方案的优缺点,改进了大断面隧道双侧壁导坑法施工技术,提出了"底部双导洞超前施工"的新工法.跟踪桃树坪隧道3#斜井施工工区底部双导洞超前工法试验段进行的现场围岩压力、拱顶沉降和水平位移的现场监测,验证了工法的安全、可行性;基于数值模拟分析,确定了施工中上半断面的最佳开挖高度5.4m,超前导洞1部与上半断面5部间合理步距25m,优化了底部双导洞超前施工工法的技术参数,为富水弱胶结粉细砂地层隧道的施工提供了技术保障.Taoshuping tunnel in the newly constructed Lanzhou-Chongqing railway,has a complicated geological condition of rich water and weak cemented fine sand.Combined with the method of in-situ monitoring and numerical simulation,the large cross-section tunnel construction scheme under the geological condition of rich-water and fine sand are analyzed and optimized.On the basis of comparing the advantages and disadvantages by CRD method,double-side-drift method and three steps seven footwork excavation method,the double-side-drift method for large cross-section is improved and a new method of bottom advanced double-drift method is proposed.The security and feasibility of the new method are proved by in-situ monitoring the surrounding rock pressure,vault settlement and horizontal convergence of Taoshuping tunnel 3#inclined shaft′s test section.Based on the numerical simulation,the technical parameters for the new method is optimized.The simulation results show that the optimum excavation height of upper section is 5.4 m and the most reasonable step distance between the 1 st part(advanced double-drift)and the 5 th part(upper section)is 25 m.The research results provided a technical support for tunnel construction under the condition of rich and weak cemented fine sand stratum.

关 键 词：隧道工程 弱胶结粉细砂 底部双导洞超前法 现场监测 数值模拟 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]