It is extremely difficult to study the extremely complicated changes of stress and strain in the destructive process of surrounding rock in karst tunnels. The essence of its destruction is the internal energy transformation. In order to intuitively and accurately analyze the peripheral rock damage process, based on the Zhongliangshan Tunnel of Chongqing Rail Transit Line 27, the calculation theory of peripheral rock strain energy density, elastic strain energy density and dissipation energy density are deduced based on the principle of energy conservation, and the energy density visualization program is developed and verified. Based on the developed program, the correspondence between the evolution law of internal energy density of surrounding rock and the distribution of plastic zone, maximum principal stress, vertical displacement and horizontal displacement of surrounding rock under different working conditions of different distances between the cave and the bottom of the tunnel in the presence of a cave at the bottom of the subway tunnel is analyzed. The results show that: The developed energy density visualization program can better simulate the energy evolution of the surrounding rock in the excavation process; the distribution of dissipated energy density in the surrounding rock is basically the same as the distribution of the plastic zone, and the tunnel will be damaged when the area of the dissipated energy density distribution passes through; the distribution of the elastic strain energy density around the surrounding rock is related to the distribution of the maximum principal stress, and the tunnel will be damaged when the elastic strain energy density is suddenly released; the distance of the tunnel from the cavity has a significant influence on the vertical displacement of the surrounding rock; the distance of the tunnel from the tunnel bottom has a significant influence on the vertical displacement of the surrounding rock. The distance between the tunnel and the cavern has a greater effect on the vertical displacement of the surrounding rock, and the horizontal displacement is smaller; the destruction of the tunnel surrounding rock is essentially the result of energy-driven.
Yao Yi
,
Chang Fugui
,
Wen Yuanping
,
Li Zhi
,
Wang Mingli
. Study on the Damage Mechanism of Karst Tunnel Based on Energy Visualization[J]. Chinese Journal of Underground Space and Engineering, 2024
, 20(S2)
: 841
-847
.
DOI: 10.20174/j.JUSE.2024.S2.38
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