The drainage of mountain tunnels could locally change the groundwater environment in the stratum. If the drainage principle is blindly adopted in the ecologically sensitive area, it will induce local plant ecological degradation. This paper proposes a calculation method for controlling the drainage of mountain tunnels preventing the plant ecological degradation. First, a soil moisture field model is established based on coupling analysis of the Darcy of seepage and the Feddes principle of moisture. The ecological water absorption of plants, plant transpiration, and rainfall replenishment is taken as the upper boundary conditions, the tunnel drainage rate is taken as the lower boundary conditions, and the soil water matrix potential threshold is discriminated by plant ecological wilting is taken as the optimization approximation condition. The controlling drainage of the mountain tunnel can be obtained using the golden section optimal search method. Taking pine trees as the target plant for ecological protection, the controlling drainage of the Qizi mountain Tunnel of Suzhou city is obtained using the proposed method as listed: the entrance section of 329 m3/d, the deep buried section of 336 m3/d, and the shallow buried section of 325 m3/d. Meanwhile, the controlling underground water level is obtained as listed: the entrance section of 3.6 m below the earth surface, the deep buried section of 18.9 m below the earth surface, and the shallow buried section of 14.2 m below the earth surface. The method proposed can be used as the basis and guidance for controlling drainage and ecological protection of mountain tunnels.
Zhou Jun
,
Zhang Peng
,
Fu Jinyu
,
Ji Yufeng
,
Chen Hao
. Calculation Method on Drainage Control of Mountain Tunnel Considering Plant Ecological Degradation[J]. Chinese Journal of Underground Space and Engineering, 2024
, 20(S1)
: 403
-410
.
DOI: 10.20174/j.JUSE.2024.S1.47
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