摘要
香丽高速虎跳峡地下立交工程是香丽高速公路关键控制工程之一,为国内目前断面最大的山区地下立交隧道。该工程的超大断面隧道中间外凸处最大开挖跨度达28.96 m,拱顶呈扁平状,施工时易引起围岩松弛失稳、坍塌;有无中墙连拱隧道结构复杂、受偏压影响较大,施工时易引起初期支护开裂。为满足快速施工及安全要求,对施工方法进行研究。将连拱隧道先行洞中侧拱脚设计成扩大式拱脚,2层支护结构改为3层。针对超大断面隧道围岩加强支护,注浆后采用二台阶预留核心土法开挖,相比最初采用的双侧壁导坑法,开挖效率提高近3倍,大幅提高施工速度。通过对监测数据进行分析,表明该施工方法有效可行,能够达到施工目的及要求。
Hutiaoxia underground interchange project of Xiangli expressway is one of the key control projects of Shangrila to Lijiang highway. It is the mountain underground interchange tunnel with the largest cross section in China at present. The maximum excavation span in the convex part of the super-large cross-section tunnel of the project is 28.96 m, and the dome is flat, which easily causes the surrounding rock to relax, lose stability and collapse during construction. In order to meet the requirements of rapid construction and safety, the construction methods are studied. The side arch foot of the leading tunnel of the multi-arch tunnel is designed as an enlarged arch foot,and the two-layer support structure is changed into three layers. To strengthen the support of the surrounding rock of the super-large crosssection tunnel, the two-step core retaining soil method is adopted to excavate after grouting.Compared with the original double-side wall pit guiding method, the excavation efficiency is improved nearly three times. The analysis of monitoring data shows that this method is effective, and the purpose and requirements of the construction are achieved.
作者
郭成刚
孙杰
杨远怀
余隆
陈维
陈兴培
吴永红
GUO Chenggang;SUN Jie;YANG Yuanhuai;YU Long;CHEN Wei;CHEN Xingpei;WU Yonghong(China Railway 17 Bureau Group No. 2 Engineering Co., Ltd., Xi′an 710043, Shaanxi, China;Yunnan Construction and Investment Holding Group Co., Ltd., Kunming 650501, Yunnan, China;School of Building Engineering, Kunming University of Science and Technology, Kunming 650504, Yunnan, China;Yunnan Transportation Planning and Design Institute, Kunming 650041, Yunnan, China;Yunnan Bohang Transportation Technology Co., Ltd., Kunming 650000, Yunnan, China)
出处
《隧道建设（中英文）》
北大核心
2018年第A02期232-238,共7页
Tunnel Construction
基金
国家自然科学基金资助项目(51669009
50878152)
关键词
地下立交
立交隧道
设计
施工方法
underground interchange
interchange tunnel
design
construction method
