| Citation: |
Zhi-hua Yang, Chang-bao Guo, Rui-an Wu, Wei-wei Shao, Peng-fei Yu, Cai-hong Li, 2023. Potential seismic landslide hazard and engineering effect in the Ya’an-Linzhi section of the Sichuan-Tibet transportation corridor, China, China Geology, 6, 228-240. doi: 10.31035/cg2023032
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Potential seismic landslide hazard and engineering effect in the Ya’an-Linzhi section of the Sichuan-Tibet transportation corridor, China
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Abstract
The Sichuan-Tibet transportation corridor is located at the eastern margin of the Qinghai-Tibet Plateau, where the complex topography and geological conditions, developed geo-hazards have severely restricted the planning and construction of major projects. For the long-term prevention and early control of regional seismic landslides, based on analyzing seismic landslide characteristics, the Newmark model was used to carry out the potential seismic landslide hazard assessment with a 50-year beyond probability 10%. The results show that the high seismic landslide hazard is mainly distributed along large active tectonic belts and deep-cut river canyons, and are significantly affected by the active tectonics. The low seismic landslide hazard is mainly distributed in the flat terrain such as the Quaternary basins, broad river valleys, and plateau planation planes. The major east-west linear projects mainly pass through five areas with high seismic landslide hazard: Luding-Kangding section, Yajiang-Xinlong (Yalong river) section, Batang-Baiyu (Jinsha river) section, Basu (Nujiang river) section, and Bomi-Linzhi (eastern Himalaya syntaxis) section. The seismic action of the Bomi-Linzhi section can also induce high-risk geo-hazard chains such as the high-level glacial lake breaks and glacial debris flows. The early prevention of seismic landslides should be strengthened in the areas with high seismic landslide hazard.
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References
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Zhi-hua Yang, Chang-bao Guo, Rui-an Wu, Wei-wei Shao, Peng-fei Yu, Cai-hong Li, 2023. Potential seismic landslide hazard and engineering effect in the Ya’an-Linzhi section of the Sichuan-Tibet transportation corridor, China, China Geology, 6, 228-240. doi: 10.31035/cg2023032
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Figure 1.
Geological settings of the Sichuan-Tibet transportation corridor (the simplified geological data comes from the regional geological maps with 1∶200000 scale).1–Quaternary alluvium, moraine, etc.; 2–terrestrial clastic rocks, marine clastic rocks and volcanic rocks; 3–terrestrial clastic rocks, marine sedimentary rocks in the South Tibet (sand-shale mixed with marl); 4–marine sand slate mixed with limestone, sand-shale, conglomerate and volcanic rocks; 5–Mesozoic stratification; 6–Gondwana facies (limestone, sand-slate mixed with basalt and phyllite); 7–mixed stratum; 8–Gondwana facies (sand-shale, marble and limestone); 9–molarite of middle-upper Devonian; 10–mixed stratum of upper Paleozoic; 11–Pre-Devonian metamorphic sand-slate, gneiss and marble; 12–limestone mixed with phyllite, marble mixed with mafic volcanic rocks; 13–mixed stratum; 14–clastic rocks and volcanic rocks; 15–mixed stratum of lower Paleozoic; 16–Proterozoic; 17–Archean; 18–Mesozoic mixtite; 19–Himalayan granite; 20–Late Yanshanian-Himalayan granite; 21–Yanshanian granite; 22–Hualisian-Yanshanian granite; 23–Proterozoic granite; 24–diorite type; 25–ultramafic rocks; 26–alkaline rocks; 27–drainage; 28–faults.
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Figure 2.
Active faults and historical earthquakes in the Ya’an-Linzhi section of the Sichuan-Tibet transportation corridor (the simplified faults from the regional geological maps with 1∶200000 scale and the earthquake epicenter data from the China Earthquake Administration).
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Figure 3.
Major geo-hazard distribution in the Ya’an-Linzhi section of the Sichuan-Tibet transportation corridor.
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Figure 4.
Seismic landslides characteristics in the Ya’an-Linzhi section of the Sichuan-Tibet transportation corridor.a–Mogangling landslide in the Luding county; b–Temi landslide in the Batang county; c–Luanshibao landslide in the Litang county; d–55 Daoban landslide in the Luhuo county.
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Figure 5.
Landslide characteristics induced by the MS 6.8 Luding earthquake in the Sichuan province in 2022. a–Deformation and failure of the Mogangling landslide accumulation body; b–landslide and debris flow in the Yanzi gully; c–Xinhuancun landslide in the Detuo town; d–S211 crossroad landslide in the Detuo town.
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Figure 6.
Engineering geological units in the Ya’an-Linzhi section of the Sichuan-Tibet transportation corridor.
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Figure 7.
Slope static safety factor in the Ya’an-Linzhi section of the Sichuan-Tibet transportation corridor.
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Figure 8.
Slope critical acceleration in the Ya’an-Linzhi section of the Sichuan-Tibet transportation corridor.
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Figure 9.
Peak seismic ground acceleration in the Ya’an-Linzhi section of the Sichuan-Tibet transportation corridor.
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Figure 10.
Seismic slope displacement distribution in the Ya’an-Linzhi section of the Sichuan-Tibet transportation corridor.
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Figure 11.
Potential seismic landslide hazard in the Ya’an-Linzhi section of the Sichuan-Tibet transportation corridor.