RISK ASSESSMENT OF SEISMIC LANDSLIDE WITHIN SMALL REGION BASED ON MULTI-LEVEL PHYSICAL AND MECHANICAL PARAMETERS: A CASE STUDY OF SHIMIAN AND ADJACENT AREAS IN THE UPPER REACHES OF YANGTZE RIVER

SONG Zhi; NI Hua-yong; ZHOU Hong-fu; FENG Wei

Volume 22 Issue 3

Sep. 2016

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Article Navigation > Journal of Geomechanics > 2016 > 22(3): 760-770

SONG Zhi, NI Hua-yong, ZHOU Hong-fu, et al., 2016. RISK ASSESSMENT OF SEISMIC LANDSLIDE WITHIN SMALL REGION BASED ON MULTI-LEVEL PHYSICAL AND MECHANICAL PARAMETERS: A CASE STUDY OF SHIMIAN AND ADJACENT AREAS IN THE UPPER REACHES OF YANGTZE RIVER. Journal of Geomechanics, 22 (3): 760-770.

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RISK ASSESSMENT OF SEISMIC LANDSLIDE WITHIN SMALL REGION BASED ON MULTI-LEVEL PHYSICAL AND MECHANICAL PARAMETERS: A CASE STUDY OF SHIMIAN AND ADJACENT AREAS IN THE UPPER REACHES OF YANGTZE RIVER

1.
Chengdu Institute of Geology and Mineral Resources, Chengdu 610008, China
2.
School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China

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Abstract

Abstract

Compared to the risk assessments of seismic landslide before, this paper achieves the landslide and collapse inventory, loose accumulated layer and the physical and mechanical parameters of rock soil mass of geological units by field survey, remote sensing interpretation and data collection. It makes an organic integration of landslide inventory, geological survey and regional Newmark displacement model. During three degrees of the landslide inventory, it can been seen that the physical and mechanical parameters get smaller gradually from the first degree to the third degree, which also inflects the importance of the landslide inventory for risk assessment and that it accords better with reality. The dangerous areas and regular under different peak acceleration are got by assessing the potential risk of geological hazard in Shimian City on the upper Yangzi River. Through the linear fitting of risks, when peak acceleration is 0.3, the dangerous areas increase greatly on the large scale that is the critical value of the regional devastating disaster. Meanwhile, the dangerous area gradually transit from that under the control of landslide inventory to that of slope, which shows the validity of the risk assessment under multi-level physical and mechanical parameters.
- landslide,
- risk,
- mechanical parameters,
- landslide inventory

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