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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

Damage phenomenon of a four sided rock slope in the Wenchuan earthquake.
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ijerph-12-09181-f003: Damage phenomenon of a four sided rock slope in the Wenchuan earthquake.

Mentions: According to the distribution of the hazards and the landscape conditions, a twenty-three person team headed to disaster zone and a field investigation area was established. The field investigation area (see Figure 1), with a total area of thousands of square kilometers, was carefully investigated. However, because of the traffic, there were some areas that we could not reach, so a total of 1104 large hazards were investigated in detail. Among these hazards, there are 538 collapses, 462 landslides and 104 debris flows, and then a statistical analysis for the landslides according to the slope angle and slope type was made, as shown in Figure 2 and Figure 3. Figure 2 and Figure 3 show that the multi-aspect terrain facing empty isolated mountains and thin ridges was seriously damaged, and the slope angles of most landslides was larger than 45°, which shows that there is some effect of slope type and slope angle on the earthquake responses of slopes, especially acceleration responses, which is the immediate cause triggering landslides.


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)

Damage phenomenon of a four sided rock slope in the Wenchuan earthquake.
© Copyright Policy
Related In: Results  -  Collection

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

ijerph-12-09181-f003: Damage phenomenon of a four sided rock slope in the Wenchuan earthquake.
Mentions: According to the distribution of the hazards and the landscape conditions, a twenty-three person team headed to disaster zone and a field investigation area was established. The field investigation area (see Figure 1), with a total area of thousands of square kilometers, was carefully investigated. However, because of the traffic, there were some areas that we could not reach, so a total of 1104 large hazards were investigated in detail. Among these hazards, there are 538 collapses, 462 landslides and 104 debris flows, and then a statistical analysis for the landslides according to the slope angle and slope type was made, as shown in Figure 2 and Figure 3. Figure 2 and Figure 3 show that the multi-aspect terrain facing empty isolated mountains and thin ridges was seriously damaged, and the slope angles of most landslides was larger than 45°, which shows that there is some effect of slope type and slope angle on the earthquake responses of slopes, especially acceleration responses, which is the immediate cause triggering landslides.

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