Analysis on Two Typical Landslide Hazard Phenomena in The Wenchuan Earthquake by Field Investigations and Shaking Table Tests.
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.
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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 |
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Mentions: It is well known that the selection of similar materials plays a vital role in model tests [23]. The materials of the one-sided, two-sided and four-sided slope models which are made up by compounding barite powder, river sand, gypsum, clay and water are chosen by comparison with different similar systems. The ratio of the similar materials in different models and their mechanical parameters are listed in Table 1 and Table 2. With the help of the artificial consolidation and mechanical compaction, the models is set up, as shown in Figure 7. A foam layer with 30 mm width is attached to the inner wall of the model box to eliminate the reflection of waves and as a consequence, eliminate the boundary effect, as Figure 8 illustrates. WenChuan-WoLong earthquake waves, EI Centro earthquake waves and Kobe seismic waves of 0.1 g, 0.2 g, 0.4 g, 0.7 g and 1.0 g can be input into the shaking table, and in this particular case WenChuan WoLong earthquake waves with 0.1 g, 0.2 g, 0.4 g and 0.7 g seismic wave were adopted for this research and corresponding time history curves are displayed in Figure 9. As for acceleration measurement points, five measuring points are arranged in each slope of the one-sided and two-sided rock steep slopes from top to bottom, as shown in Figure 10 and Figure 11, respectively, while four three-dimensional acceleration measuring points are arranged in each slope of the four-sided rock steep slope from top to bottom, as described in [22]. |
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.
No MeSH data available.