Influence of Shield Attitude Change on Shield–Soil Interaction

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.

Load characterization of the main bearing of a large tunnel boring machine based on dynamic characteristic parameters

“…Shen et al 23 concluded that shield-soil interaction affects the change of the shield attitude to some extent; they found that it could better reflect the load because the system attitude is taken into account. Via the establishment of a group-adjustable thrust hydraulic system, the change of the hydraulic cylinder thrust has been used to reflect the sudden change of the external load.…”

Intelligent Prediction of Multi-Factor-Oriented Ground Settlement During TBM Tunneling in Soft Soil

“…The limitation of numerical methods, however, lies in the evaluation of the input parameters involved in the constitutive models (Ninić et al, 2017). Besides, implementing all operational factors in numeric simulations simultaneously is challenging (Khisamitov and Meschke, 2018;Ren et al, 2018;Shen et al, 2019). However, these operational factors are significant for estimation of tunneling-induced ground surface settlement.…”

“…Ren et al (2018) (Ren et al, 2018) evaluated the gap area between the double-O-tube (DOT) shield machine by considering pitching, yawing, and rolling features. Shen et al (2019) considered pitching angle and yawing angle to investigate shield-soil interactions and proposed a prediction model. Owing to the complexity of shield-soil interactions, datadriven models were triggered using artificial intelligence methods (Cho, 2009;Ochmański et al, 2015;Chen et al, 2016;Pooya Nejad and Jaksa, 2017;Qi and Tang, 2018).…”

“…In the present study, 12 possible input parameters potentially influencing maximum tunneling-induced settlement were selected based on engineers' experience and concerns (Suwansawat and Einstein, 2006;Shen et al, 2019). The BNGR method was introduced to extract relevant features and form a data-driven optimal model, which was validated using the testing database.…”

Measurement and Simulation Analysis of Vertical Cross Longitudinal Settlement between Turning Shield and Foundation Pit

“…With the increasingly tense urban space, it is inevitable for an urban shield tunnel to cross under and side through the existing building structure. e disturbance impact on the surrounding building structure is a problem that must be considered in the shield construction of urban subway tunnel; aiming at the settlement disturbance analysis of surrounding buildings caused by shield construction of urban subway tunnel, scholars have analyzed such problems from the perspectives of construction monitoring [1][2][3], theoretical analysis [4][5][6][7][8], and numerical simulation [9][10][11][12][13]31]. ere are many related research results, most of which are lateral disturbance analysis of straight-line section shield, while there is less analysis on the disturbance of existing building structure caused by the construction of turning shield tunnel, the interaction mechanism between turning shield tunnel excavation and existing buildings is more complex, which is affected by turning radius, advance excavation volume, ground conditions, tunnel structural characteristics, relative space position between shield and tunnel, type of shield machine, shield construction parameters, and whole process [14][15][16][17][18].…”