Abstract
The mechanism of shield–soil interaction and multi-phase equilibrium control theory in shield tunneling process still lack sufficient understanding. Aiming at this problem, with the improved calculation method of loose earth pressure, the initial boundary problem of shield attitude calculation was solved. Based on the ground reaction curve, the shield–soil interaction was simulated by the equivalent springs, and the displacement of surrounding soil was calculated during the change of the shield attitude. Then, the theoretical method of surrounding soil load acting on the shield were obtained. In summary, the calculation method of shield attitude was obtained. This method has three main applications in engineering, namely the inversion of shield–soil interaction force, the prediction of pitch angle and the prediction of yawing angle. Finally, combined with Jinan Metro Line R2 shield tunnel project, the shield attitude was monitored in real time and compared with the theoretical value. The results show that the trend of the theoretical values of pitch angle and yawing angle were basically the same as the measured value, but the theoretical value was generally larger than the measured value. The research results can provide a useful reference for the shield attitude adjustment.
Highlights
Shield tunneling has been widely used in the construction of urban subway tunnels
According to the method of this paper and in Approximately 0.5force acting on the shield periphery can be calculated in the non-uniform clay stratum
Through the guiding system and data monitoring system of the earth pressure balanced shield (EPB), when the shield had been advancing at Ring 504, partition cylinder thrust, pitch angle and yawing angle were recorded every 1 min
Summary
Shield tunneling has been widely used in the construction of urban subway tunnels. The automatic control system used to control the shield attitude is based on existing engineering experience and not supported by appropriate theories [5]. How to properly control the advance load is one of the main concerns in the construction of shield tunnels. Relevant research mainly focuses on the two directions of advance load modeling and automatic correction. The difficulty in establishing a shield tunneling mechanics model is that the forces around the shield cannot be calculated and expressed accurately. Many scholars have carried out a series of studies on the establishment of shield tunneling mechanics models and attitude control. Koyama et al [6]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
