Introduction of building foundation settlement?

When it comes to the settlement of foundation backfill, the relevant builders are still relatively unfamiliar. What are the precautions in the process of building foundation settlement? The following are the basic contents of Zhong Da Consulting for the builders to sort out the foundation settlement of related houses, and the specific contents are as follows:

Foundation settlement refers to the settlement of foundation surface caused by the compaction of foundation soil layer under the action of additional stress. Excessive settlement, especially uneven settlement, will make the building tilt and crack, so that it can not be used normally.

In view of the housing foundation settlement, the basic contents of housing foundation settlement are as follows:

Depth calculation method

The depth of settlement calculation can be determined by the method in Code for Building Foundation (GB50007-2002).

Relationship between stress and deformation

In the stress and deformation of foundation soil, it is assumed that the foundation is a linear deformation body and the elastic theory is directly applied to solve it. Practice shows that for low compressibility soil, when the building load is small and the average pressure at the bottom of foundation does not exceed the proportional limit of soil, the sum of stresses should be linear, and the result is close to the elastic theoretical solution. When the load increases, the situation is very different. For example, the stress-strain relationship of high compressibility soft soil is nonlinear at first. Therefore, in order to study the deformation of high compressibility soil and reflect the real situation of deformation in a larger load range, it is necessary to regard soil as a nonlinear deformation body.

Selection of compressibility index of soil

It can be seen from the formula for calculating the final settlement of foundation that the accuracy of foundation settlement calculation is closely related to the compressibility index of soil. Sometimes, due to improper selection or unreliable compressibility index, settlement calculation is completely meaningless. The compressibility index of soil should fully reflect the actual deformation characteristics of excavated soil under the action of building load in natural state. However, under the existing conditions, the stress state and deformation on the foundation during indoor test and load test are different from the actual situation, and these differences are different for different soils and different test conditions.

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