Heavy rainfall in Sichuan triggered landslides. How did the village party secretary save 239 people?

Zhang, the village secretary, found that there were many cracks in the pavement of Jiuguquan Village in Jifeng Town, Sichuan Province, and reported the danger to the local township government department and the duty room of the county natural resources bureau in time. Government departments and the Natural Resources Bureau used the danger report to quickly mobilize villagers to eliminate risks, ensuring the safety of 239 people's lives and property. This happened in Zhongjiang County, Sichuan Province. Zhongjiang county issued a yellow rainstorm warning on the evening of August 14, and upgraded it to an orange rainstorm warning on August 15, and issued three-level warning information on meteorological risks of geological disasters. The relevant departments of Sichuan province require disaster prevention and mitigation personnel in early warning areas to strengthen the inspection of hidden dangers.

Why can you avoid danger by finding ground fissures? This should be analyzed from the induced causes and impending disaster precursors of landslide disasters. The inducing factors are related to geotechnical types, geological structural conditions, geomorphological conditions, hydrogeological conditions and heavy rainfall. The heavy rainfall of this landslide in Sichuan is undoubtedly the direct inducing factor. Landslides with different types, properties and characteristics will show different abnormal phenomena before sliding. Show signs (precursors) of landslides. To sum up, the common ones are as follows:

1. Before the landslide, the spring water revived at the toe of the landslide front, or the spring water (well water) suddenly dried up, and the water level of the well (well) suddenly changed.

2. In the landslide, transverse and longitudinal radial cracks appear in front, which reflects that the landslide has been pushed forward and has entered the state of impending sliding.

3. Before large-scale sliding, the soil at the toe of the front slope of the landslide appears uplift (uplift), which is an obvious forward push phenomenon of the landslide.

4. Before the landslide, there was a sound of rock cracking or being squeezed by shear. This phenomenon reflects deep deformation and rupture. Animals are very sensitive to this and have abnormal reactions.

5. Before the landslide, the rock (soil) around the landslide will collapse and relax on a small scale.

6. If there are long-term displacement observation data in the landslide, both horizontal displacement and vertical displacement will accelerate before the large sliding. This is a clear sign that sliding is about to happen.

7. The cracks at the rear edge of the landslide expand rapidly, and hot air or cold air gushes out from the cracks.

8. Before the landslide, the animals in the landslide were frightened and the plants were abnormal. For example, pigs, dogs and cows are frightened, don't sleep, mice scurry around and don't go into holes. Trees wither or skew, etc. The pavement cracks observed by Secretary Zhang are actually the cracks at the rear edge of the landslide. According to the precursor of landslide, Natural Resources Bureau and local government departments achieved zero casualties in this residential landslide.