the reason for the landslide in Maoxian County, Sichuan Province is clear! On June 24, a mountain collapse occurred in Maoxian County, ABA, Sichuan Province, resulting in the burial of 62 rural houses and the loss of 118 people. According to the preliminary analysis of experts' field survey, this is a high-level remote landslide debris flow disaster induced by rainfall. Many readers put forward what is the high remote landslide debris flow? Is there any way to prevent the sudden geological disaster? How to prevent and avoid the mountain collapse? Follow the steps of Xiaobian to see the causes of the mountain landslide in Sichuan? Why can't we give an early warning?
Reason
Heavy rainfall is the cause of mountain collapse
'last straw'
Collapse is also called collapse and collapse, which refers to the phenomenon that the rock and soil on the steep slope suddenly break away from the parent rock under the action of gravity, and collapse, rolling and accumulation of valleys. In rainy season, the rainfall intensity is large or lasts for a long time. Some mountain rocks are loose and cracked, which is easy to cause collapse.
He Siming, a researcher at Chengdu Institute of mountain research, Chinese Academy of Sciences, said the disaster was also a large-scale landslide disaster in the disaster area after Wenchuan earthquake. "As for the cause of the landslide, the previous rainfall in the disaster area may be the last straw that caused the landslide.";. '
According to the analysis of experts, there are 15 days of rainfall in this area in the near future. The amount of accumulated water is large, and the infiltration of rainwater leads to the decrease of rock mass strength. At the same time, rainfall produces water pressure, which is more likely to induce landslides. (this article is exclusively compiled by WYH, editor of sihai.com. If you need to reprint it, please indicate the source and source. Related article link: http://www.4hw.com.cn/life/zone.html)
Experts believe that apart from more rainfall in the near future, there are many possible causes of mountain collapse. Tian Tingshan, executive deputy director of the geological disaster emergency technical guidance center of the Ministry of land and resources, said that the causes of the collapse are relatively complex. In addition to rainwater, the stability of some mountain rock masses will be reduced, and sudden collapse will occur. Especially after the "5-middot; 12" earthquake, the whole Sichuan mountain has some looseness, the mechanical property is reduced, the stability is reduced, and the rainfall is more likely to induce the collapse. The Ministry of land and resources has always listed Wenchuan earthquake area as a key area for geological disaster prevention and control.
Fan Xiao, a professor level senior engineer of Sichuan Bureau of Geology and mineral resources, said that the geological disaster belongs to the Diexi earthquake site, where the regional crustal movement is relatively active. After the Diexi earthquake in 1933, a beaded barrier lake was formed in the Minjiang River. To the north of this area is the Western Sichuan Plateau, the Minjiang gorge below, the Chengdu Plain and Sichuan basin below. The geological structure is unstable and geological disasters occur frequently.
Pei Xiangjun, a professor at the school of environment and civil engineering, Chengdu University of technology, said that the geological disaster occurred in the songpinggou fault, where earthquakes occurred frequently in history. 'the earthquake has brought the quality damage of deep rock mass to the stratum - that is & lsquo; internal injury & rsquo; rather than & lsquo; skin disease & rsquo;. "Affected by the earthquake, the stability of the mountain declined, and it is easier to induce landslides when encountering rainfall," he said. How to solve this phenomenon is a great challenge facing the whole world. 'Pei Xiangjun said. (this article is exclusively compiled by WYH, editor of sihai.com. If you need to reprint it, please indicate the source and source. Related article link: http://www.4hw.com.cn/life/zone.html)
Human activities also become new causes of disasters
In addition to natural causes such as earthquake, rainfall and flood, with the development of economy and society, human activities have become a new inducement of geological disasters that can not be ignored. Mining and engineering construction may cause mountain collapse.
As long as the stability of the mountain reaches the limit edge, any trigger factor may cause the collapse of the mountain. Collapse is not limited to the rainy season. As long as the mountain is unstable, it may happen at any time. Therefore, it is very important to investigate the hidden dangers in the construction sites of key projects and construction projects. In addition to the rainy season in the flood season, the relevant parties shall strictly implement the risk assessment system of geological disasters and urge the construction unit to carry out the risk assessment of geological disasters in accordance with the relevant provisions of the state; the construction, design, construction and supervision unit must pay attention to the relevant prevention and control suggestions and take practical measures to prevent and control geological disasters.