L and B are the length and width of foundation, respectively.
In this study, the lateral boundary of soil was placed at a distance of four times the width of foundation.
In Korean Design Criteria, the allowable displacement width of the foundation for the high-speed rotary machine foundation is specified as maximum 0.06 mm.
In this study, a finite difference method, incorporated in the Fast Lagrangian Analysis of Continua 2D software, is employed to investigate this influence in terms of two key variables: the depth width ratio (the depth of the compressible soil to the bedrock/the width of the foundation) and the bedrock inclination (assuming the dip perpendicular to the direction of the strip foundation).
The reduction of the foundation width in contact during uplift induces an increase of the stresses under the foundation.
It is shown that shallow soil improvement may, indeed, be quite effective provided that its depth is equal to the width of the foundation.
For a settlement of 15% of foundation width, the maximum improvement in bearing capacity for coir geocell was found to be 7.92 compared to 5.83 in the case of planar forms.
There is a dearth of field data with which to compare these correlation factors, in particular where foundation width and depth have been varied in the same ground conditions.
The embedment depth to foundation width ratio (D f/B) is varied from 0.01 to 2.0 for the eigenvalue analysis, and as expected, increasing depth of embedment results in reduced flexibility in the system leading to reduced natural period (Fig. 9).
Seismic wall sliding is dominant and rotation is negligible for rigid walls when the ratio between the wall height and the foundation width is less than 1.4, while for greater ratios the wall becomes more flexible and rotation (rocking) increases till the ratio reaches 1.8 where overturning is susceptible to take place.
In fact, previous experimental studies on rigid oscillators 52 have shown that improvement, that is, densification of a soil layer of depth equal to the foundation width (4 m deep in this particular case) may drastically reduce rocking-induced foundation settlements, thereby alleviating concerns about the idea of implementing rocking isolation in practice.
