At present tunnels are often designed to be located in multiple strata, and there was a controversy over the calculation of tunnel surrounding rock pressure in binary strata:When there was a significant difference in geological parameters between two formations, the commonly used mean method was no longer applicable based on the principle of taking the average value of parameters. By studying the problem of limitations on the use of homogeneous formations in the calculation of surrounding rock pressure using the Poisson's theory in binary formations, this paper records a modeling method for Poisson's natural arch in binary formations and improves the calculation formula. Based on the physical properties of the strata, a new calculation width scalar W is named to derive a modified calculation method for the pressure of tunnel surrounding rock in the binary strata, known as the modified parameter method. By analyzing practical engineering cases, the modified parameter method and commonly used mean value method were compared with actual engineering data. The conclusion of the study is that as the differences in geological characteristics of binary strata increase, the difference between the common mean method results and the measured values increases, with the maximum difference of 15.8%. The mean method is no longer applicable. The modified parameter method takes into account the characteristics of binary formations and is suitable for various situations of binary formations. It also provides a reference for the calculation of surrounding rock pressure in the same situation.
Chen Zhimin
,
Jiang Yiwen
,
Li Yazi
,
Gong Jun
,
Li Zengyin
. Study on the Pressure of Pucci Surrounding Rock in a Deep Buried Tunnel Crossing a Binary Stratum[J]. Chinese Journal of Underground Space and Engineering, 2024
, 20(S2)
: 582
-588
.
DOI: 10.20174/j.JUSE.2024.S2.09
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