Abstract
The article deals with the method of reducing the compressibility of the subsidence soil under the bottom of a slab foundation of a multi-storey apartment building by reinforcing the soil with rigid elements, which are concrete piles in rolled wells. This method is effective because it eliminates the subsidence properties of the soil and significantly increases the deformation modulus, which causes a decrease in the amount of precipitation of the foundations of the designed object. An example of the use of this method for a multi-storey apartment building and the results of field plate load tests of artificially improved soil are given.
Highlights
Engineering and geological surveys on construction sites in the Northern residential area of Orenburg revealed the presence of subsidence soils at the top of the logs with thickness from 2.0 to 9.0 m in depth
- reducing of settlement values or differential settlements for one section as well as for adjacent sections leading to a building tilt
- driving or bored piles with full or partial cutting of the slumping stratum; - slab-pile foundation; - layer-by-layer compaction of subsiding soil; - chemical fixation of subsiding soil; - compaction with ground piles in punched wells; - reinforcement of subsiding soil with rigid elements, such as bored piles or piles in rolled wells filling by compacted soil, soil-cement, crushed stone, concrete or augercast piles
Summary
Engineering and geological surveys on construction sites in the Northern residential area of Orenburg revealed the presence of subsidence soils at the top of the logs with thickness from 2.0 to 9.0 m in depth This revealing demands from designers of multi-storey apartment buildings (from 12 to 25 storey height), based on a monolithic foundation slab with the pressure on the soil from 0.25 to 0.40 MPa, the solution of the following task:. The characteristic values of physical and mechanical characteristics of EGE-2 are as follows: - soil density – 1.91 g/cm3; - natural moisture – 0.19 %; - dry soil density - 1.60 g/cm3; - density of solids – 2.70 g/cm3; - porosity index – 0.68 u.f.; - water saturation coefficient – 0.76 u.f.; - humidity at the limit of plasticity – 0.21 u.f.; - liquid limit – 0.34; - plasticity index – 0.13 u.f.; - index of liquidity
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