In assessing whether the foundation subsidence has reached a stable state, it is necessary to take a comprehensive look at multiple factors, including continuous observation data, subtle changes in the appearance of the building, accurate measurements of the degree of tilt, factors affecting the surrounding environment and in-depth geological survey results, as well as comprehensive assessments by professional organizations. This process emphasizes long-term and systematic monitoring to ensure that the conclusions are scientific, accurate and reliable, thus providing a solid guarantee for the structural safety and long-term use of the building.

First, the settlement concept

Building settlement refers to the phenomenon of vertical deformation and subsidence caused by compaction of soil foundation or structure under the action of additional stress. In particular, uneven settlement will cause the structure to tilt and crack so that it can not be used normally.

Second, the judgment method

To determine and judge whether the high-rise buildings settlement solution has been stabilized is a process that requires comprehensive consideration of several factors. Here are some of the main methods and steps:

1. Regular monitoring and data analysis

(1) Leveling: The use of high-precision measuring instruments such as level to regularly monitor the settlement of the foundation and continuously observe the data. Then, by comparing the measured data at different time points, the variation trend of sedimentation is analyzed.

(2) Settlement and time relationship curve:

① Draw the curve of the relationship between the settlement amount and time, and observe the changing trend of the curve.

② For key monitoring and scientific research observation projects, if the settlement amount in each period is not more than 2 times the measurement error in the last three cycles of observation, it can be considered to have entered the stable stage.

(3) In general observation engineering, if the settlement speed is less than 0.01~0.04mm/d (the specific value is determined according to the compressibility of the foundation soil in each region), it can also be considered that the foundation subsidence has entered the stable stage.

④ When the sedimentation velocity is greater than 2mm/d for 2 consecutive months, and there is no termination trend in the short term, it is assessed as a dangerous state

2. On-site observation and evaluation

(1) Crack observation: Pay attention to subtle changes in the appearance of the building, observe whether there are new cracks in the walls, ground, columns and other structures of the building, or whether the original cracks are no longer developed. The stop of crack development is an important sign that the foundation subsidence tends to be stable.

(2) Inclination measurement: accurate measurement of inclination degree, the use of professional inclination measuring instruments to measure the inclination of the building. If the inclination does not increase and remains within the safe range, it can be considered that the foundation subsidence tends to be stable.

3. Inspection of the surrounding environment: pay attention to the influencing factors of the surrounding environment, and check whether there are new signs of subsidence on the ground and roads around the foundation. If the surrounding environment also remains stable and there is no further deformation, it helps to judge that the foundation subsidence has stabilized.

4. Geological investigation: Compare the geological investigation report before construction and the supplementary investigation report after construction, confirm the results of in-depth geological investigation, analyze whether the physical and mechanical properties of the soil layer have been stabilized, and the change of groundwater.

5, professional evaluation: commissioned qualified professional institution engineers to monitor the data and the situation of the site for comprehensive evaluation and judgment. Professional knowledge and experience are essential to accurately judge whether the foundation subsidence is stable.

6. Note: The stability judgment of foundation subsidence requires long-term monitoring and analysis, and can not be concluded solely based on short-term data. Many methods should be used to improve the accuracy and reliability of the judgment when judging the stability of the foundation subsidence.

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