DEVELOPMENT CHARACTERISTICS AND STABILITY ANALYSIS OF THE HONGHUATUN ANCIENT LANDSLIDE AT SONGPAN TUNNEL ENTRANCE OF CHENGDU-LANZHOU RAILWAY

REN Sanshao; GUO Changbao; WU Ruian; SHEN Yaqi; ZHANG Tao

Volume 23 Issue 5

Oct. 2017

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Article Navigation > Journal of Geomechanics > 2017 > 23(5): 754-765

REN Sanshao, GUO Changbao, WU Ruian, et al., 2017. DEVELOPMENT CHARACTERISTICS AND STABILITY ANALYSIS OF THE HONGHUATUN ANCIENT LANDSLIDE AT SONGPAN TUNNEL ENTRANCE OF CHENGDU-LANZHOU RAILWAY. Journal of Geomechanics, 23 (5): 754-765.

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DEVELOPMENT CHARACTERISTICS AND STABILITY ANALYSIS OF THE HONGHUATUN ANCIENT LANDSLIDE AT SONGPAN TUNNEL ENTRANCE OF CHENGDU-LANZHOU RAILWAY

REN Sanshao^{1, 2
,},
GUO Changbao^{1, 3
,
,},
WU Ruian¹,
SHEN Yaqi¹,
ZHANG Tao¹

1.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
2.
School of Engineering and Technology, China University of Geosciences, Beijing 100083, China
3.
Key Laboratory of Neotectonic Movement and Geohazard, Ministry of Land and Resourses, Beijing 100081, China

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Abstract

Abstract

Chengdu-Lanzhou Railway, which is located in the eastern Tibetan Plateau, is in the middle section of the north-south seismic belt in China. A series of large-giant landslides developed and ancient landslides revived frequently along the railway under the coupling of endogenic and exogenic forces, which cause great harm to the planning and construction of railway projects. Field investigations indicate that Chengdu-Lanzhou Railway tunnel entrance under planning and construction is located in the slope toe of the Honghuatun ancient landslide. In recent years, the landslide has been partially revived under the influence of heavy rainfall and human engineering activities, and it poses a major threat to the railway and the village below. So the construction of anti-slide piles has been carried out by the railway departments to protect landslide. Based on the field investigation, the in-situ large direct shear test and stability simulation analysis were implemented to the ancient landslide. Results show that the shear strength of gravel soil of this landslide is large enough in natural conditions and it is obviously related to the content of the crushed stone. With the increase of stone content, the cohesive force of gravel soil has a tendency to decline, while the internal friction angle has a rising trend. Numerical simulation results based on FLAC^3D show that Honghuatun landslide is generally stable in natural conditions, and the local stress state of the slope is changed by the excavation of the railway. Under the action of heavy rainfall, the rain water further weakens the mechanical strength of the sliding body, and the ancient landslide mass become deformed obviously, and there is also a large cracking deformation at the lower part of the landslide. The deformation of the landslide has been effectively controlled under the management of lattice anchor and anti-slide pile, and the deformation is slight which only exist in the foot of the slope. The landslide is inclined to instability under the influence of dry-wet circulation, earthquake and human engineering activities, which would endanger the railway tunnels and residents' safety, and therefore measures should be taken and strengthened, such as mass prediction, disaster prevention and stability monitoring.
- Chengdu-Lanzhou Railway,
- ancient landslide,
- in-situ direct shear test,
- numerical simulation,
- revivification mechanism

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致谢: 中国地质科学院地质力学研究所杨志华博士参加了本文的野外工作，汪西海教授级高工在试验过程中给予了指导，在此表示感谢。

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DEVELOPMENT CHARACTERISTICS AND STABILITY ANALYSIS OF THE HONGHUATUN ANCIENT LANDSLIDE AT SONGPAN TUNNEL ENTRANCE OF CHENGDU-LANZHOU RAILWAY

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DEVELOPMENT CHARACTERISTICS AND STABILITY ANALYSIS OF THE HONGHUATUN ANCIENT LANDSLIDE AT SONGPAN TUNNEL ENTRANCE OF CHENGDU-LANZHOU RAILWAY

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