摘要
Anewsimplemathematicalmethod has been proposed to predict rock stress around a noncircular tunnel and themethod is calibrated and validatedwith a numerical model.It can be found that the tunnel shapes and polar angles affect the applicable zone of the theoretical model significantly and the applicable zone of a rectangular tunnel was obtained using this method.The method can be used to predict the values of the concentrated stress,and to analyze the change rate of rock stress and back to calculate the mechanical boundary condition in the applicable zone.The results of the stress change rate indicate that the horizontal stress is negatively related to the vertical boundary load and positively related to the horizontal boundary load.The vertical stress is negatively related to the horizontal boundary load and positively related to the vertical boundary load.These findings can be used to explain the evolution of the vertical increment in stress obtained with field-based borehole stress monitoring.
基金
This work is supported by the National Natural Science Foundation of China through contracts Nos.51474209,51574227 and 51604268
the Fundamental Research Funds for the Central Universities(No.2014XT01)
the Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions(No.SZBF2011-6-B35)
the Research Innovation Program for College Graduates of Jiangsu Province(No.KYLX160559).
