Abstract
The paper presents the experience of building and structure strengthening in Tyumen soil conditions which are often presented by a soft water saturated clay and sand layer of the quaternary period. All buildings mentioned in the paper had uneven settlements due to complex engineering and geological conditions and the wrong choice of foundation type. Thin drilled injection piles with a diameter of 200 mm were used for foundation strengthening. All the piles were installed on the solid soil base during the drilling process regardless of the depth of its location. No rules have so far been approved to calculate the bearing capacity of thin drilled injection piles. That was the reason for defining the drilled injection pile bearing capacity at every facility. The paper describes the methods and test results obtained in the study. It was found out that all piles had unexpectedly high bearing capacity. The paper also contains the results of geotechnical monitoring before and after base building strengthening by drilled injection piles which show the current decrease of settlements and the efficiency of this base strengthening method.
Highlights
The southern territory of Tyumen region is characterized in geotechnical structure by soft silt loam clay formations with up to 20-35 m in depth from the ground surface underlain by hard sand or firm clay
Further the paper presents some examples of drilled injection piles application for underpinning residential buildings foundations that have excessive uneven settlements and tilts in the city of Tyumen
2.1 Drill-injection piles of Atlant and Normal type Obviously, there are no reliable solutions when choosing a type of foundation
Summary
The southern territory of Tyumen region is characterized in geotechnical structure by soft silt loam clay formations with up to 20-35 m in depth from the ground surface underlain by hard sand or firm clay. Surrounding soil is often anisotropic and non-uniform within the foundation active zone. It has the following mechanical properties: an internal friction angle: 14 – 22 degrees; specific cohesion: 0.02 – 0.05 MPa; the modulus of deformation (Young Modulus): 2 – 12 MPa. Soil conditions of the south of Tyumen region can be classified as complex for building and structure design and construction. Soil conditions of the south of Tyumen region can be classified as complex for building and structure design and construction Neglect of these factors causes uneven settlements and tilts of buildings both during their construction and maintenance, which give rise to emergency situations at the facilities. Strengthening of existing foundations (strip, piled, slab and pile-slab foundations) by drilled injection piles of Atlant and Normal type is one of the solutions which is successfully applied on the southern territory of Tyumen region
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