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| Citation: | Wang Yunsheng, Su Yi, Feng Zhuo, Wu Dechao, Wang Daoyong, 2022. Luding Section of Luding Ductile Shear Zone and Its Engineering Effects. Earth Science, 47(3): 794-802. doi: 10.3799/dqkx.2022.043
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The Luding ductile shear zone is the middle section of the north-south Daduhe fault and is an important part of the "Y" structure in Sichuan and Yunnan. The Sichuan-Tibet Railway Luding bridge spans the Luding ductile shear zone near Bairiba, Luding County, and the tunnel on the left bank crosses the No.5 mylonite belt. The composition and activity of the ductile shear zone directly affect major foundation projects. Based on the fine cataloguing of excavation profiles of flat tunnels and highways, and the identification of thin sections, the distribution characteristics, composition characteristics and fault activity of the Luding ductile shear zone were studied. The main conclusions are as follows: (1) The Luding ductile shear zone can be divided into five zones from west to east, among which ①, ③ and ⑤ are felsic mylonite belts, and ② and ④ are mylonitized amphibolites. The Luding segment of the Luding ductile shear zone is distributed at the bottom of the valley and the left bank of the bridge area, with a total width of about 1 000 m. The belts ① and ③ traverse the bridge site from north to south, the fault occurrence is N15°-20°E/NW∠55°-65°, the fault width is 500 m, mainly gray felsic mylonite and thousand mylonite. The belt ⑤ extends along the Taiyanggou-Wuligou and crosses the tunnel on the left bank. The occurrence is N43°E/NW∠54°, and the fault width is 500 m. Mylonite is felsic mylonite, zonal-small eyeball mylonite. (2) Cut by the fault zone, the structural joint density of the river reach is high, the number of groups and stages are many, the rock mass is broken, and the integrity of the rock mass is poor. (3) The Luding ductile shear zone was deformed by ductile shear in Jinning Period, and was transformed by brittle fractures since the Mesozoic, but no large-scale brittle fracture zone was formed. The overall impact on the Luding bridge was small, and the engineering effect was mainly manifested in the tunnels on both sides of the Dadu river. The stability of the inlet and outlet slopes is poor and the integrity of the surrounding rock in the left bank cave is poor.
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