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Analysis on Two Typical Landslide Hazard Phenomena in The Wenchuan Earthquake by Field Investigations and Shaking Table Tests.

Yang C, Zhang J, Liu F, Bi J, Jun Z - Int J Environ Res Public Health (2015)

Bottom Line: Considering the above disaster phenomena, the reasons are analyzed based on shaking table tests of one-sided, two-sided and four-sided slopes.The analysis results show that: (1) the amplifications of the peak accelerations of four-sided slopes is stronger than that of the two-sided slopes, while that of the one-sided slope is the weakest, which can indirectly explain the phenomena that the damage is most serious; (2) the amplifications of the peak accelerations gradually increase as the slope angles increase, and there are two inflection points which are the point where the slope angle is 45° and where the slope angle is 50°, respectively, which can explain the seismic phenomenon whereby landslide hazards mainly occur on the slopes whose slope angle is bigger than 45°.The amplification along the slope strike direction is basically consistent, and the step is smooth.

View Article: PubMed Central - PubMed

Affiliation: School of Civil Engineering, Key of Transportation Tnuuel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China. yangchangwei56@163.com.

ABSTRACT
Based on our field investigations of landslide hazards in the Wenchuan earthquake, some findings can be reported: (1) the multi-aspect terrain facing empty isolated mountains and thin ridges reacted intensely to the earthquake and was seriously damaged; (2) the slope angles of most landslides was larger than 45°. Considering the above disaster phenomena, the reasons are analyzed based on shaking table tests of one-sided, two-sided and four-sided slopes. The analysis results show that: (1) the amplifications of the peak accelerations of four-sided slopes is stronger than that of the two-sided slopes, while that of the one-sided slope is the weakest, which can indirectly explain the phenomena that the damage is most serious; (2) the amplifications of the peak accelerations gradually increase as the slope angles increase, and there are two inflection points which are the point where the slope angle is 45° and where the slope angle is 50°, respectively, which can explain the seismic phenomenon whereby landslide hazards mainly occur on the slopes whose slope angle is bigger than 45°. The amplification along the slope strike direction is basically consistent, and the step is smooth.

No MeSH data available.


Related in: MedlinePlus

Peak acceleration amplification coefficient in the different directions subjected to different intensity earthquakes. (a) Acceleration amplifications in different slope angles and different directions when the input PGA = 0.1 g. (b) Acceleration amplifications in different slope angles and different directions when the input PGA = 0.2 g. (c) Acceleration amplifications in different slope angles and different directions when the input PGA = 0.4 g; (d) Acceleration amplifications in different slope angles and different directions when the input PGA = 0.7 g.
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ijerph-12-09181-f016: Peak acceleration amplification coefficient in the different directions subjected to different intensity earthquakes. (a) Acceleration amplifications in different slope angles and different directions when the input PGA = 0.1 g. (b) Acceleration amplifications in different slope angles and different directions when the input PGA = 0.2 g. (c) Acceleration amplifications in different slope angles and different directions when the input PGA = 0.4 g; (d) Acceleration amplifications in different slope angles and different directions when the input PGA = 0.7 g.

Mentions: In order to illustrate the effect of slope angle on elevation amplification of acceleration, this paper uses the shaking table test results from the four-sided slope to perform some analysis (Note: if we use X-Y-Z global coordinates for our analysis, which will lead the some problems because this model has four sides, therefore, this paper selects local coordinates that use the surface face direction L, slope strike direction M and vertical direction N to analyze the effect of slope angle on elevation amplification of acceleration, as shown in Figure 15. The results are shown in Figure 16.


Analysis on Two Typical Landslide Hazard Phenomena in The Wenchuan Earthquake by Field Investigations and Shaking Table Tests.

Yang C, Zhang J, Liu F, Bi J, Jun Z - Int J Environ Res Public Health (2015)

Peak acceleration amplification coefficient in the different directions subjected to different intensity earthquakes. (a) Acceleration amplifications in different slope angles and different directions when the input PGA = 0.1 g. (b) Acceleration amplifications in different slope angles and different directions when the input PGA = 0.2 g. (c) Acceleration amplifications in different slope angles and different directions when the input PGA = 0.4 g; (d) Acceleration amplifications in different slope angles and different directions when the input PGA = 0.7 g.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4555273&req=5

ijerph-12-09181-f016: Peak acceleration amplification coefficient in the different directions subjected to different intensity earthquakes. (a) Acceleration amplifications in different slope angles and different directions when the input PGA = 0.1 g. (b) Acceleration amplifications in different slope angles and different directions when the input PGA = 0.2 g. (c) Acceleration amplifications in different slope angles and different directions when the input PGA = 0.4 g; (d) Acceleration amplifications in different slope angles and different directions when the input PGA = 0.7 g.
Mentions: In order to illustrate the effect of slope angle on elevation amplification of acceleration, this paper uses the shaking table test results from the four-sided slope to perform some analysis (Note: if we use X-Y-Z global coordinates for our analysis, which will lead the some problems because this model has four sides, therefore, this paper selects local coordinates that use the surface face direction L, slope strike direction M and vertical direction N to analyze the effect of slope angle on elevation amplification of acceleration, as shown in Figure 15. The results are shown in Figure 16.

Bottom Line: Considering the above disaster phenomena, the reasons are analyzed based on shaking table tests of one-sided, two-sided and four-sided slopes.The analysis results show that: (1) the amplifications of the peak accelerations of four-sided slopes is stronger than that of the two-sided slopes, while that of the one-sided slope is the weakest, which can indirectly explain the phenomena that the damage is most serious; (2) the amplifications of the peak accelerations gradually increase as the slope angles increase, and there are two inflection points which are the point where the slope angle is 45° and where the slope angle is 50°, respectively, which can explain the seismic phenomenon whereby landslide hazards mainly occur on the slopes whose slope angle is bigger than 45°.The amplification along the slope strike direction is basically consistent, and the step is smooth.

View Article: PubMed Central - PubMed

Affiliation: School of Civil Engineering, Key of Transportation Tnuuel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China. yangchangwei56@163.com.

ABSTRACT
Based on our field investigations of landslide hazards in the Wenchuan earthquake, some findings can be reported: (1) the multi-aspect terrain facing empty isolated mountains and thin ridges reacted intensely to the earthquake and was seriously damaged; (2) the slope angles of most landslides was larger than 45°. Considering the above disaster phenomena, the reasons are analyzed based on shaking table tests of one-sided, two-sided and four-sided slopes. The analysis results show that: (1) the amplifications of the peak accelerations of four-sided slopes is stronger than that of the two-sided slopes, while that of the one-sided slope is the weakest, which can indirectly explain the phenomena that the damage is most serious; (2) the amplifications of the peak accelerations gradually increase as the slope angles increase, and there are two inflection points which are the point where the slope angle is 45° and where the slope angle is 50°, respectively, which can explain the seismic phenomenon whereby landslide hazards mainly occur on the slopes whose slope angle is bigger than 45°. The amplification along the slope strike direction is basically consistent, and the step is smooth.

No MeSH data available.


Related in: MedlinePlus