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Aiming at the problem of excessive settlement of the station caused by the new tunnel close to the existing station, relying on the project of Xi'an Metro Line 8 close to the Convention and Exhibition Center Station of Line 2, the numerical simulation and onsite monitoring are used to analyze the control effect of various control measures on the deformation of the existing station during the construction of the underpass. The recommended values of construction parameters of the tunnel in the loess area are given. The results show that: (1) The construction method and excavation footage have obvious effect on the deformation control of the station when it is close to the underpass. After the construction method is adjusted from the upper and lower step method to the onsite CRD method, the maximum settlement of the station is reduced by 50%. After the excavation footage is adjusted from 1.5 m to 0.5 m, the maximum settlement of the station is reduced by 30%. (2) The staggered distance between the upper and lower pilot tunnels and the erection of temporary steel support have a weak effect on the deformation control of the station, which can be appropriately adjusted according to the engineering geology and onsite monitoring. (3) Based on the project, the construction scheme of onsite CRD method +0.5 m excavation footage +5 m singleside cavern upper and lower guide hole staggered distance +5 m spacing temporary steel support is adopted. The onsite monitoring data are basically the same as the deformation law obtained by numerical calculation. The maximum settlement of the station side wall, ballast bed and track is 3.76, 2.91, 2.51 mm respectively, and the maximum differential settlement at the deformation joint is 3.54 mm, which meets the requirements of the station deformation control standard.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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