摘要
为探索太原地铁2号线盾构隧道下穿迎泽湖段施工过程中存在的安全隐患,基于流固耦合理论,运用FLAC3D建立三维数值模型,研究了盾构掘进过程中隧道拱顶沉降、围岩孔隙水压力、围岩竖向应力及管片应力的分布规律。结果表明,施工过程中,隧道拱顶沉降值逐渐增大,且土体后期固结沉降量所占比重较大;盾构掘进开挖极可能造成隧道拱腰两侧发生涌水事故;随着盾构隧道的推进,围岩竖向应力值逐步变大,且在隧道周边产生应力集中现象;盾构掘进过程中管片衬砌环上无拉应力产生,不会出现开裂现象。
In order to explore the hidden danger of shield tunneling under Yingze Lake section of Taiyuan Metro Line 2, based on fluid-solid coupling theory, a three-dimensional numerical model was established by using FLAC3D. The distribution law of the settlement of tunnel vault, pore water pressure of surrounding rock and vertical of surrounding rock and segment stress during shield tunneling were studied. The results show that during the construction process, the settlement value of tunnel vault increases gradually, and the proportion of soil consolidation settlement is larger;Shield tunneling excavation is likely to cause water gushing accident on both sides of tunnel arch waist;With the advance of shield tunneling, the vertical stress value of surrounding rock increases gradually, and stress concentration occurs around the tunnel. In the shield tunneling process, there is no tensile stress on the lining ring of the segment, so there will be no cracking phenomenon.
作者
陈路海
郤保平
熊贵明
王帅
吴阳春
CHEN Lu-hai;XI Bao-ping;XIONG Gui-ming;WANG Shuai;WU Yang-chun(Department of Underground Engineering, Taiyuan University of Technology, Taiyuan 030024, China;Key Laboratory of Insitu Property Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China)
出处
《水电能源科学》
北大核心
2019年第7期94-98,共5页
Water Resources and Power
基金
国家自然科学基金项目(51874207)
山西省自然科学基金项目(201701D121131)
山西省基础研究面上项目(201701D22111320)
关键词
盾构隧道
流固耦合
拱顶沉降
孔隙水压力
应力
shield tunnel
fluid-solid coupling
vault settlement
pore water pressure
stress
