Abstract In order to verify the applicability of surrounding rock classification and support design method based on Q system in large underground caverns, taking Jinzhou large underground oil storage cavern project as an example, the mathematical function relationship among Q value, RMR value and BQ value was established in light of the statistical data of the Q value and geological sketch at the construction site as well as the empirical formula of Q value,furthermore the correlation between Q value and the main mechanical parameters of surrounding rocks was obtained, and the method of rapid obtaining Q value was put forward. The result shows that the Q value is in a logarithmic function with the RMR value with the coefficient of 0.99 and almost the same grade levels of surrounding rocks can be obtained by the two methods; the Q value is linearly related to the BQ value with the coefficient of 0.92; the surrounding rock classification obtained by BQ method is basically the same as that obtained by the two methods mentioned above if the Q value and the RMR value are smaller, while there is a difference of one level for the surrounding rock classification obtained by BQ method if the Q value and the RMR value are larger and the determined classification of surrounding rock is relatively high. The relatively accurate parameter values can be obtained by referencing the proposed corresponding table between common parameters and Q values when the measured values cannot be obtained.
Abstract：
In order to verify the applicability of surrounding rock classification and support design method based on Q system in large underground caverns, taking Jinzhou large underground oil storage cavern project as an example, the mathematical function relationship among Q value, RMR value and BQ value was established in light of the statistical data of the Q value and geological sketch at the construction site as well as the empirical formula of Q value,furthermore the correlation between Q value and the main mechanical parameters of surrounding rocks was obtained, and the method of rapid obtaining Q value was put forward. The result shows that the Q value is in a logarithmic function with the RMR value with the coefficient of 0.99 and almost the same grade levels of surrounding rocks can be obtained by the two methods; the Q value is linearly related to the BQ value with the coefficient of 0.92; the surrounding rock classification obtained by BQ method is basically the same as that obtained by the two methods mentioned above if the Q value and the RMR value are smaller, while there is a difference of one level for the surrounding rock classification obtained by BQ method if the Q value and the RMR value are larger and the determined classification of surrounding rock is relatively high. The relatively accurate parameter values can be obtained by referencing the proposed corresponding table between common parameters and Q values when the measured values cannot be obtained.
ZHANG Heng ZHANG Gang SUN Jianchun ZHUYimo CHEN Shougen
.Correlation Analysis of Q Value and Mechanical Parameters of Surrounding Rocks and Its Engineering Application[J] MODERN TUNNELLING TECHNOLOGY, 2019,V56(5): 26-34
2019, Vol. 56 