1, the reason for taking 0.4 is that the distribution of additional stress is not linear. If the distance is too large, there will be a big error, so the thickness should not be too thick. In fact, this is also an empirical value, and the maximum upper limit is this. In practice, due to the objective reasons of groundwater level and soil distribution, most of them are still less than 0.4b ..

2. Advantages: the physical concept is clear and the calculation process is not difficult.

Disadvantages: the relationship between the calculated results and the measured values: medium foundation, the calculated values are roughly equal to the measured values; Soft foundation, the calculated value is less than the measured value; The foundation is solid, and the calculated value is much larger than the measured value. In addition, because the foundation thickness should be specified as hi≤0.4b, the calculation workload is large and the process is complicated.

(Manual, please adopt! )