Research on construction mechanical effect of shallow buried tunnel #br#
under rainfall condition
Hou Fujin1,2 Han Xianmin3,4 Li Shucai1 Li Wenjiang3,4 Li Xinzhi3,4
1. Geotechnical and Structural Engineering Center, Shandong University, Jinnan 250000, China;
2. Shandong Ji Lai Intercity Expressway Co., Ltd., Shandong University, Jinnan 250000, China;
3. School of Civil Engineering, Shijiazhuang Tiedao Univeristy, Shijiazhuang 050043, China;
4. Key Laboratory of Roads and Railway Engineering Safety Control of the Ministry of Education, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
Abstract：Rainfall infiltration would significantly influence the stability of shallow buried tunnel in construction period. Laohushan tunnel, as a connection line of expressway between Peking and Shanghai, is located in Jinan city. Based on the tunnel, the evolution law of seepage field in the shallow buried section of tunnel entrance were firstly studied by numerical simulation under rainfall conditions. Furtherly, construction mechanical response of double-side-drift excavation method were analysed by means of fluid-solid coupling model. And stress of surrounding rock, stress and deformation of primary support were mainly studied under different infiltration times. It could be conclued that stability of tunnel 40m long near entrance were seriously imflunced by rainfall. Underground phreatic line caused by rainfall infiltration run through the whole tunnel. And pore water pressure lying in the interface between soil and rock were relatively large. Due to rainfall infiltration, stress of surrounding rock and deformation of primary support increased. And compressive stress of primary support increased, but the tensile stress decreased. When the rain was over, the influence became the largest, and the rainfall influence was eliminated about 20 days after the end of rainfall.
侯福金 韩现民 李术才 李文江 李新志. 降雨对隧道浅埋段施工力学效应影响研究[J]. 土木工程学报, 2019, 52(S2): 139-148.
Hou Fujin Han Xianmin Li Shucai Li Wenjiang Li Xinzhi. Research on construction mechanical effect of shallow buried tunnel #br#
under rainfall condition. 土木工程学报, 2019, 52(S2): 139-148.
