The article describes design of a pile with new rotary anchors for foundations of buildings operating on variable loads or on heaving soils. The results of plate load tests on piles’ pressing in with one- and two anchor levels are presented. Based on calculations on bearing capacity of piles of proposed design, the adequacy of data on determination of its bearing capacity obtained by experimental method is calculated. Bearing capacity of anchor piles for pulling out is determined by calculations. Anchors located at one level at the height of pile increase its bearing capacity for pressing in by 20%, and increase it for pulling out by 94%. Anchors located at two levels at the height of pile increase bearing capacity of pile for pressing in by 60%, and increase bearing capacity for pulling out by three times. A decrease in the settlement of pile of proposed design is determined by the results of plate load tests on pressing in and it amounts to 85% for a pile with one-level anchors and to 94% for a pile with two-level anchors.

Вшивков А.С., Бочкарева Т.М. Применение композитных материалов в технологии устройства буронабивных свай в обсадных трубах // Вестник Пермского национального исследовательского политехнического университета.

A new design of horizontal pivoting pile anchors used as supports for main pipelines on heaving and watered bases is proposed. The purpose of the design is to reduce the deformability of this type of Foundation and increase its load-bearing capacity under the influence of the forces of frost heaving of the soil. Stamp tests of models of piles with rotary anchors were performed on the stand for testing Foundation models of NPP GEOTECH. Based on the test results, the effectiveness of using piles with the location of their rotary anchors at one and two levels along the trunk was compared, and the reduction in the load-bearing capacity of the pile with an unfavorable location of the anchors was determined. It is shown that according to the results of stamp tests, the rotary anchors of piles positively affect the operation of the Foundation. The use of rotary anchors in one level increases the load-bearing capacity of the pile by 16 % and reduces shrinkage by 40 % compared to a pile of the same size, but without anchors. The use of anchors in two levels increases the load-bearing capacity of the pile by 73 % and reduces the draft by 48 %. The advantage of a pile with two levels of anchors compared to its own with one level of anchors is 48 % in terms of load-bearing capacity and 11 % in terms of draft. The use of rotary pile anchors can significantly increase the reliability of the foundations of main pipelines on heaving and watered bases. This design solution is more efficient than similar metal piles with vertical anchors at equal cost levels.

The article is dedicated to the problem of geotechnics. The problems of the weak soil base are topical. Also there sometimes happen severe accidents of soil mass. A great number of such emergencies is of a progressive character, when a local crash leads to the crash of the whole construction. Tarring the soil with epoxy can ensure geotechnical safety of the basis. That’s why the improvement of this method is needed in order to reduce yielding of the base, create ground water cutoff or create building hoisting. In the article new structural solutions for reduction of settlement are presented. The authors suggest using the manufactured plane elements containing epoxy. Such elements have different sizes and lie underneath the foundation. Similar structural scheme can be used to reduce soil settlement. The authors carried out two series of plate-bearing model tests with manufactured plane epoxy elements. In the first series of tests the biggest element was closer to the foundation, the smallest element was closer to the biggest element. In the second series of tests the smallest element was closer to the foundation, the biggest element was closer to the smallest element. After the end of plate-bearing model tests the authors received values of the base settlement and the dependency diagrams “base settlement-soil pressure”. The new structural solution for reducing soil settlement proved to be effective. Settlement of base decreased sevenfold.