Here, it is obvious to the harmful effect on the stability of the soil at the base of surface water, freely falling under the sole of the foundation, mainly near the corners of the building. When frosts occurred at the foundation, heaps formed that violated the initial structure of the soil and made it heterogeneous. As a result of this, the corners of the building settled and the longitudinal walls were exposed to fracture, which is confirmed by the formation of cracks in both longitudinal walls of the boiler room according to the grooves left for the partition and the nature of these cracks, opening up and going below them at the bottom. The deviation of the longitudinal walls outside was caused by the presence of a overturning moment from the outstanding expansion of the rafter farms, which created uneven settlement of the soil under the walls and the settlement of their external faces.
The presence of mineral and organic acids penetrating to the foundations. This usually leads to a decrease in internal friction in the soil of the base, and therefore to a decrease in the bearing capacity of the base. In addition, acids destroy the very body of the foundations.
When building one NZ. large village plots, on which the chemical plant was previously located, a variety of chemical production waste and dumps of toxins were found that transmitted significant acidity to soil waters. The entire area did not have the correct flow of surface waters, which increased the level of groundwater standing, which created significant difficulties when making foundations.
When examining by drilling and piercing the geology of the site under the two buildings of the buildings, it turned out that, within the second case, clay soils with an admixture of sand that decreasing in the depths prevail, the surface soil was a bulk layer. A dense gray clay served as a litter layer, first with the rise, reaching the largest mark in the middle part of the case, after which the layer of this clay falls steeply towards the first case and goes under a significant depth. Sand lies on top of the clay under this case, in which its foundations are laid, while the foundations of the second case are laid on clay. Such a waterproof layer of gray clay, forming a jumper in the path of movement of groundwater, caused their back to 2 m, as a result of which the basement of the second building turned out to be flooded. To lower the water level, a local drainage was arranged towards the first case with the drain of water into the absorption well arranged in the sandy soil of the lower pool, after which the water under the second case decreased to the planned mark.
