Abstract
At trenchless laying of engineering communications in soil the method of static puncture has received wide application at formation of a well. Power plants that implement it have small dimensions, which make them more effective in laying distribution engineering networks in tight urban conditions. Problem. The main disadvantages of the method are the low accuracy of the trajectory and the significant stress in the soil after its compaction, which can lead to the destruction of adjacent underground objects. The first disadvantage is solved by controlling the trajectory of the soil-piercing working body. To solve the second question, it is necessary to know and take into account the specifics of the formation of communication cavities in the soil with an asymmetric tip, which is used for this purpose. Goal. The aim of the work is to establish the regularity of the process of soil puncture by the soil-piercing working body with an asymmetric tip in the form of a cylinder cut at an angle. Methodology. The approaches adopted in the work to solve this goal are based on the theories of deep soil cutting, scientific foundations of soil mechanics, their normative physical and mechanical properties and the law of conservation of soil mass before and after compaction. Results. The calculated dependences for determining the size of the destructive zone from the elastic-plastic deformation of the soil during its puncture by an asymmetric tip with a frontal surface in the form of a beveled cylinder and the pressure of the deformed soil on underground objects are obtained. It is established that the maximum size of the destruction zone and its pressure on underground objects will occur in solid sand. With a tip diameter of 0.3 m, their values can reach 5 m and 0.245 MPa, respectively. Originality. The obtained regularities of soil puncture by a working body with an asymmetric tip in the form of a beveled cylinder made it possible to get an idea of the influence of its deformed state on adjacent communications depending on geometric parameters of the tip and physical and mechanical properties of soils. Practical value. The obtained results can be recommended in the design and determination of technological capabilities of installations for static soil puncture.
Highlights
Among the existing technologies of developing horizontal wells for trenchless laying of utilities, the method of static soil puncture is the most common
With a maximum well diameter D = 0.325 m, which is recommended when using the technology of static soil puncture, the size of the zone of elasticplastic deformation, or possible destructive action on adjacent underground objects can reach more than 5 m
From a comprehensive analysis of the technical literature, it was determined that the expansion of the most effective and most common static method of soil puncture in trenchless utilities is possible by increasing the puncture distance through controlling the trajectory of the working body
Summary
Among the existing technologies of developing horizontal wells for trenchless laying of utilities, the method of static soil puncture is the most common. For cylindrical tips with an annular cross-section, which work on the combined principle, when the soil is partially extruded by a pointed conical working edge on the outer contraction and partially penetrates into the pipe cavity, is within 2 diameters In the latter case, the zone of destruction is determined experimentally for a specific type of soil with certain physical and mechanical properties, which limits the use of the results. The lack of analytical calculations to measure the zone of soil density change relative to its initial natural state around such a tip does not allow making a full analysis of the puncture process or determining the impact of deformed soil on adjacent communications and other underground objects near the future network.
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