1. Key Laboratory of Urban Underground Engineering of Ministry of Education, Beijing Jiaotong University, Beijing 100044, China;
2. Tunnel and Underground Engineering Research Center of Ministry of Education, Beijing Jiaotong University, Beijing 100044, China;
3. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China
Abstract：In order to study the interaction between the shield machine and the soil under the excavation state, the interaction model between the shield and the soil considering the rheological properties of soil was established based on the viscoelastic theory and superposition principle, and a calculation method for the contact stress between the shield machine and the soil considering the structural characteristics of the shield mechanism, the tunneling speed and the soil rheological timeliness was proposed. The viscoelastic solution was compared with the elastic solution, and the results show that the viscoelastic solution is larger than the elastic solution. The sensitivity of soil viscosity coefficient, shield tunneling speed and downtime to the contact stress between the shield and the soil was analyzed. The results show that the contact stress between shield machine and soil decreases and tends to be stable with the increase of viscosity coefficient; the contact stress decreases and approaches to the elastic contact stress distribution curve with the increase of tunneling speed; the contact stress increases and reaches stability with the increase of downtime.
