Geotechnical barrier and its impact on foundation settlement of adjacent buildings

Abstract

In dense urban there are additional foundation settlement operated buildings at a nearby construction sites. The calculations revealed that the greatest effect on reduction of more strip foundation settlement of existing buildings is achieved by the construction separating barrier between the buildings (the geotechnical barrier), which is the lower end rests in the low-compressible soil. To reduce the development of additional settlement strip foundations of the existing building on the effect of pressure transmitted to a ground base located near the new slab foundation is considered the work of the geotechnical barrier in various ground conditions. In the first variant of soil, conditions (variant 1) made geotechnical barrier structure in a homogeneous thickness of the weak clay soil. In the second variant of soil conditions (variant 2), a separating barrier is performed in a two-layer base. The upper base layer (carrying) is shown a weak water-saturated clay soil, and the second (underlying) - low compressible soil (sandy loam plastic). According to the results of the calculations and modeling found that, the greatest positive effect on the separating barrier structure (geotechnical barrier) is achieved in the case when the base is a two-layer. The lower part of the geotechnical barrier must be recessed into the soil of low compressibility. Additional settlement strip foundation of the existing building in a uniform basis (variant 1) in the absence of geotechnical barrier is approximately 50 mm. In the case of a two-layer base (variant 2), the additional settlement strip foundation building is reduced by 75-80 % (38 mm) and will make about 12 mm. The calculations revealed that the greatest effect on reduction of more strip foundation settlement of existing buildings is achieved by the construction separating barrier between the buildings (the geotechnical barrier), which is the lower end rests in the low- compressible soil.