Is the surrounding houses safe after the road is trapped?
If there is a subsidence on the road surface next to the home, can the house itself “be safe and fearless�
Zhang Jichao, professor of the School of Civil Engineering at Guangzhou University, said that the key to the safety of surrounding buildings after subsidence depends on the foundation structure. If the multi-storey building is a natural foundation, safety will be affected.
Liang Weixiong, executive deputy chairman of the Guangdong Provincial Civil Construction Society, explained that the high-rise buildings that are being constructed now use pile foundations and will be hard-rocked or rock and soil layers to support the house. The surrounding soil loss will not cause great damage to the stability of the buildings. influences. If the new project is caused by the loss of soil in the surrounding area, it may be seen that the road surface settlement causes cracks with the first floor of the building. This is a relatively common phenomenon. However, due to the support of the pile foundation, the security threat to the building itself will not be great. After the settlement of the road, it is necessary to rely on backfill to solve the problem.
In the early years, the low-rise bungalows in the old town used natural foundations instead. The looseness of the soil below would have a great potential for housing safety. If the surrounding area is found to be subsidence, we must pay close attention to the changes in the surrounding ground. We must also pay attention to whether there are major cracks or tilts in our houses.
Prevention advice
1 hire retired technicians to inspect
Liang Weixiong stated that the geological conditions in Guangzhou itself are not very good. When large-scale commercial office buildings are excavated in the basement and the development of underground space such as subways, they will cause soil erosion under the surrounding road surface. After a period of accumulation, if there is heavy rain and continuous precipitation, it is easy to cause Ground trap. Therefore, we must strengthen the monitoring of subway lines and large commercial buildings when excavating deep foundation pits.
However, due to the limited manpower of government departments, the city’s large-scale projects are all-sided and it is impossible to conduct a comprehensive inspection. “For example, the line along line 14 is very wide and it is impossible to go to the inspection every day.†Therefore, he suggested that like the Auxiliary Police, some retired geotechnical technicians could be hired to conduct fixed-point inspections and daily patrols should be conducted on the road surface where soil erosion is more likely to occur. This group of people has technology and is also very willing to prevent the city. Gravity makes efforts.
2 Establishing a Citizen Complaint Reporting System
Liang Weixiong also suggested setting up a citizen complaints reporting system and finding out that there are cracks and depressions next to the road surface to report in a timely manner, and that appropriate rewards can also be given.
However, the reporter learned that this emergency call is mainly made after the occurrence of subsidence and other disasters, but if it is found that the pit road has hidden dangers, it is necessary to find the highway authority; found that there is a settlement between the building and the road It is also necessary to understand the competent party before conducting the report.
3 start rainstorm plan ahead of prevention
Zhang Jichao believes that there are different precautions for different types of depressions. In terms of geological precautions, Guangzhou is much better than many other cities. Large-scale engineering activities are now over. It is only necessary to step up precautions when entering the flood season.
He suggested that a rainstorm plan should be initiated, and the geology inspection of the road surface should be carried out before the rainstorms in the municipal department, and prevention should be carried out in advance. Disaster reduction and disaster prevention can prevent subsidence. Prior to the rainstorm, municipal staff should be given advance posts. Now that the facility is very complete, we can use the geological radar to detect whether there are holes under the road surface and discover problems and give early warning. For example, as Beijing will be on important nodes, geological surveys will be conducted in advance on important sites in the night.
4 Metro design avoids poor geological sites
Experts suggest that in the planning, urban construction should be avoided in karst ground subsidence danger areas.
Liang Weixiong said that general geological surveys must be carried out before the general construction. Points should be taken to see how many meters below the road surface are backfills, how many meters are silts, how many meters are sand layers, and how many meters are clay layers, do a good job in geological analysis. However, the drilling point cannot be too dense. When the subway is in design, it is necessary to do geological drilling survey. It is necessary to consider avoiding poor geological points as much as possible. In areas where subsidence is prone to occur, it is important to choose a preventable type and construction plan for the foundation.
Experts also stated that it is necessary to strictly control the decline of groundwater in the region and control the occurrence of ground deformation; reduce human engineering activities, such as the impact on the disturbance of rock and soil during the construction of underground projects; underground wells such as municipal tunnels, tunnels, subways, etc. Avoid overdraining groundwater and cause ground subsidence
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