A sudden rock collapse occurred in Rongxian County, Sichuan Province, causing 1 death. How is the follow-up rescue work going?

On the afternoon of May 9, a rock collapse accident occurred in Rongxian County, Zigong City, Sichuan Province, causing five people to lose contact. On the morning of 10, The Paper reporter learned from Rongxian Municipal People's Government that 1 person had been rescued, there was no power monitoring at the scene, and emergency equipment work was still in progress.

The video of the explosion on the Internet showed that several cars, ambulances and rescue trailers were parked around the incident site, ready to drive to stand by and watch. The collapsed highway slope was suspected to have run over an industrial factory building, which contained some huge brown stones. The reporter learned that this safety accident occurred in Tongqiao Village, Xuyang Town, Rong County, which belongs to the suburbs.

Some residents said that it rained locally on the day of the incident. According to the weather forecast of May 9th in Rongxian County, it will rain during the day and at night. According to the national emergency broadcast online information, Rongxian Meteorological Observatory released the orange rainstorm warning data signal at 03: 14 on May 9, 2022: It is estimated that the precipitation in several street communities and planning areas will reach about 50mm within three hours.

On the evening of May 9, the People's Government of Rongxian County announced that a sudden rock collapse occurred in the second group of Tongqiao Village, Xu Yang Town, Rongxian County around May 9 14: 30. Cities and counties immediately organized emergency rescue equipment, went all out to rescue those who lost contact, and quickly evacuated nearby people to avoid disasters.

After on-site investigation, five people lost contact. Now 1 person has been rescued, and there is no power monitoring at the scene. The relevant departments at the provincial and ministerial levels immediately arranged for the expert group to give specific guidance. At this stage, the emergency rescue equipment work is being carried out in an orderly and intense manner.

An unexpected rock collapse happened in Rong County, Zigong City. One person has been confirmed dead. Why did the stone suddenly fall? Because of the weather and the terrain. Landslide is the collapse of rocks under the action of gravity, which mostly occurs in steep mountainous areas. Of course, falling rocks and wet and cold temperatures should be one of the main reasons. Rock collapse refers to the geological phenomenon that the rock on the slope breaks away from the parent rock under the action of gravity, suddenly collapses from the air and accumulates at the slope angle. Rockfall disasters are common in all kinds of hard rocks. Igneous rocks, clastic rocks and timely sandstone with broken structure or weak interlayer are particularly prone to rock collapse. Large-scale falling rocks will destroy coal mines and houses, block traffic, and cause serious casualties and economic losses.

This is the most widely developed fault structure in the rocks at the top of the earth. Original ecological normal fault is generated under the condition of rock formation, such as mud gap formed by magmatic rock folding or columnar normal fault formed by clastic rock freezing folding; Structural normal fault, produced by structural deformation; Unstructured normal faults, that is, normal faults caused by external driving forces, such as weathered layer, landslide or road rolling, are generally limited to shallow surface. At the edge of the cliff, sedimentary corrosion and weathering layer are the main factors to improve the rock lines (cracks), so the rocks on the cliff will always collapse.

This scientific research "is a very important scientific research, which gives us a new understanding of rock landforms." Geoffrey Moore, a geographer in Salt Lake City, said: "The distortion of 1 cm per day is not insignificant." He said that the daily temperature fluctuation will also increase the working pressure of the sheet and make it crack, which is likely to cause the rock to explode from the cliff. Stephen martel, a geographer at the University of Hawaii, said that before this scientific research, researchers largely ignored the internal stress in rocks. However, this scientific research "includes accurate measurement and theoretical research work in two industries." Internal stress is very important. When closely combined with other in-situ stresses in the rock, the pressure caused by temperature change is "the last straw to crush the camel", which in turn causes the rock to fall off the cliff, martel said.