岩溶地区复杂条件下隧道综合施工技术研究
发布时间：2018-08-08 11:01
【摘要】：沪昆铁路麻拉寨隧道穿越岩溶发育、地下水丰富、富含粘土矿物的角砾岩层,隧道反坡施工,开挖断面大、施工变形大及基底稳定性差,施工难度和风险很大。采用FLAC3D软件,对大管棚加小导管注浆综合超前支护、拱脚纵梁加固及中台阶添加临时仰拱等加固效应进行数值模拟,根据隧道周边位移、掌子面挤出变形和支护结构应力状态综合分析来选择隧道综合加固措施;在此基础上,分析不同激振频率下隧道基底有、无桩筏基础情况下列车动荷载对隧道基底工后沉降和振动的动力响应规律,研究结果表明采取隧道综合加固措施及桩筏基础后隧道底部筏板最大沉降量及最大振动速度满足要求,隧道基底长期稳定,能够为隧道后期运营的安全提供保障。所得结论可为同类隧道的设计、施工和研究提供借鉴及参考。
[Abstract]:The tunnel of Malazhai railway in Shanghai and Kunming developed through karst, rich in groundwater, rich in clay minerals, breccia layer rich in clay minerals, large excavation section, large deformation and poor stability of basement, and the construction difficulty and risk was very great. By using FLAC3D software, numerical simulation is carried out on the reinforcement effects such as comprehensive advance support of large pipe shed and small pipe grouting, reinforcement of longitudinal beam with arch foot and temporary inverted arch on middle step, according to the surrounding displacement of tunnel. The comprehensive analysis of the extrusion deformation and the stress state of the support structure is used to select the comprehensive reinforcement measures of the tunnel, and on this basis, it is analyzed that the tunnel basement has different exciting frequencies. The dynamic response of train dynamic load to post-construction settlement and vibration of tunnel foundation without pile-raft foundation. The results show that the maximum settlement and the maximum vibration velocity of the raft at the bottom of the tunnel can meet the requirements of comprehensive reinforcement measures and pile-raft foundation, and the foundation of the tunnel is stable for a long time, which can provide a guarantee for the safety of the later operation of the tunnel. The conclusions can be used for reference in the design, construction and research of similar tunnels.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.4
本文编号：2171587
[Abstract]:The tunnel of Malazhai railway in Shanghai and Kunming developed through karst, rich in groundwater, rich in clay minerals, breccia layer rich in clay minerals, large excavation section, large deformation and poor stability of basement, and the construction difficulty and risk was very great. By using FLAC3D software, numerical simulation is carried out on the reinforcement effects such as comprehensive advance support of large pipe shed and small pipe grouting, reinforcement of longitudinal beam with arch foot and temporary inverted arch on middle step, according to the surrounding displacement of tunnel. The comprehensive analysis of the extrusion deformation and the stress state of the support structure is used to select the comprehensive reinforcement measures of the tunnel, and on this basis, it is analyzed that the tunnel basement has different exciting frequencies. The dynamic response of train dynamic load to post-construction settlement and vibration of tunnel foundation without pile-raft foundation. The results show that the maximum settlement and the maximum vibration velocity of the raft at the bottom of the tunnel can meet the requirements of comprehensive reinforcement measures and pile-raft foundation, and the foundation of the tunnel is stable for a long time, which can provide a guarantee for the safety of the later operation of the tunnel. The conclusions can be used for reference in the design, construction and research of similar tunnels.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.4
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