Preliminary judgment by experts: Local ground subsidence in Tianjin belongs to sudden geological disaster subsidence | Ground | Preliminary judgment
On June 7th, the reporter learned from the Tianjin Command that preliminary progress has been made in the investigation of the causes of local ground subsidence in Balitai Town, Jinnan District. The reporter interviewed relevant experts from the expert group on the causes of ground subsidence, which is of social concern.
Question: The phenomenon of local ground subsidence in Balitai Town occurred quite suddenly. In recent days, you and the research team have been conducting professional monitoring on site, closely analyzing and judging, and guiding the disposal work. Could you please introduce the cause of this incident?
Answer: This situation is very rare. In order to understand the reasons, the Tianjin Municipal Party Committee and Government have invited more than 20 experts from departments such as the Ministry of Natural Resources, the Ministry of Housing and Urban Rural Development, and the Ministry of Emergency Management to come to Tianjin to guide their work; More than 10 professional teams from Beijing, Shanghai, Hebei, and Tianjin, including local surveyors, surveyors, surveyors, house appraisers, and architectural designers, are conducting on-site monitoring work. Based on the various information currently available, we preliminarily determine that this event belongs to a sudden geological disaster. The objective reason is that the deep geological structure is relatively complex. According to various advanced methods used by national scientific research institutions, it is inferred that there may be geological cavities below a depth of 1300 meters. This geological structure is not detectable by conventional exploration methods. It is not ruled out that the construction of geothermal wells may touch deep geological structures, leading to shallow soil erosion and ground subsidence in the affected areas.
Q: What is the extent of the impact of this ground subsidence? What is the current development trend?
Answer: From May 31st to June 2nd, the initial development of ground subsidence was rapid, and high-rise buildings facing the street were affected to varying degrees. Through a series of measures such as grouting, ground and building subsidence has significantly slowed down. After consulting with experts from relevant national departments, we believe that we are currently in a period of balanced recovery, and although there are still a few changes, the overall situation is controllable.
Q: We have noticed that the analysis of the causes of ground subsidence you mentioned is still a phased assessment result. What further measures will the expert group take next?
Answer: We will strengthen ground and building monitoring to avoid secondary disasters. We also need to mobilize technological resources and use various technical means such as geophysical methods to further explore and evaluate the deep geological structures of the strata, in order to study and formulate the next disposal plan.