1642
Proceedings of the 18
th
International Conference on Soil Mechanics and Geotechnical Engineering, Paris 2013
conducted. By results of static tests bearing ability of a stuffed
pile diameter of d = 0,6 m and long L = 8,0 m made p = 100 kN.
6 CONCLUSIONS
Taking into account it at test of a similar pile for explosive
influences the size of static squeezing loading was accepted
equal р = 80 kN, i.e. 80% from the bearing ability received by
results of static tests (fig. 6). At explosive influence by intensity
of 9 points additional increments a deposit of a skilled pile
reached S
eq
= 13,4 mm that makes about 50% from value a
precipitation received at static test (Usmanov R.A. 2009).
The analysis of results of pilot studies point to an inefficiency of
application of stuffed trailing piles both at static and at
explosive influences. In the conditions of weak water-saturated
soil and high seismic activity of platforms of construction of a
pile it is necessary to arrange in the form of piles racks with
deepening of their bottom end in strong and low-squeezed
layers of soil.
1. The conducted pilot researches, depending on intensity of
seismic influences, established decrease in bearing ability of the
bases put by weak water-saturated soil, within 10…30% and
development of considerable additional deformations. For the
better and quantitative analysis carrying out simultaneous tests
of several stamps is expedient at static loadings, components
0,8; 0,7; 0,6 and 0,5 from the size of limit bearing ability of the
bases (R);
2. The device of the high-condensed soil pillows from sand
and gravel and pebble or sandy materials in the conditions of
weak soil and high seismic activity of platforms of construction
is one of the most effective methods, allowing considerably to
increase bearing ability and to reduce compressibility of the
artificial bases, both at static, and at seismic influences. Thus
not less than 0,75 width of the foundation are recommended to
appoint their thickness;
Figure 10. Dependence of deformation of a pile on
loading at explosive influence
3. At consolidation of weak water-saturated loess soil by
vertical sandy drains and embankment weight dynamic
influences lead to increase in additional deformations of
thickness of soil and promote consolidation improvement of
quality.
4. Seismic (explosive) influences lead to loss of bearing
ability of stuffed trailing piles and development considerable
additional a deposit that as well as results of static tests, testifies
to an inefficiency of the device of trailing piles in the conditions
of weak water-saturated loess soil and high seismicity of the
region.
3 REFERENCES
Medvedev S. V. 1967. Assessment of seismic safety at explosions.
The bases, foundations and mechanics of soil No. 5, 24-26.
Lekarkin V. K. 2005. Technique of research of influence of seismo-
explosive impacts on bearing ability of the bases. Materials of the IV
international scientific conference «Modern aspects of development of
aseismic construction and seismology», Dushanbe, 169-172.
Usmanov R. A. 2009 . Water-saturated loessial soil as the bases of
buildings and constructions in the conditions of the Republic of
Tajikistan. Monograph. St. Petersburg
