Study on influence of utility tunnel leakage on its deformation and settlement of surrounding soil
Diao Yu1,2 Chu Zhenxi1,2 Song Xinxin3 Min Haihua4 Jia Zhenyang1,2 Gao Zedong1,2 Guo Yongzhi1,2
1. Key Laboratory of Coast Civil Structure Safety of Ministry of Education, Tianjin University, Tianjin 300072, China;
2. School of Civil Engineering, Tianjin University, Tianjin 300072, China;
3. Tianjin Municipal Engineering Design & Research Institute, Tianjin 300051, China;
4. North China Municipal Engineering Design & Research Institute Co., Ltd., Tianjin 300051, China
Abstract：The dislocation and opening may occur at the joints of utility tunnels under loads and could cause leakage at the joint and erosion of the surrounding soil. The coupling of the deformation and leakage at joint would further form a vicious circle. There are few studies on the effects of the forms of utility tunnels, the depth of utility tunnels, the erosion and permeability of soils on the long-term deformation of utility tunnels. Based on the proposed seepage-stress coupling model considering the overall mechanical performance of the soil-structure, the deformation of the utility tunnel and ground settlement caused by joint leakage can be quantitatively estimated. The results show that the leakage range, the leakage stable time, the number of leakage points and the ground settlement increase with the decrease of the flexural rigidity of the utility tunnel, decrease and with an decreasing tunnel depth, soil erosion and soil permeability.
