DETERMINING THE SIZE OF THE ZONE OF SOIL DEFORMATION BY A CONICAL-CYLINDRICAL TIP AND PRESSURE ON THE LATERAL SURFACE
Journal Title: Вестник Харьковского национального автомобильно-дорожного университета - Year 2018, Vol 83, Issue
Abstract
When forming a horizontal well for trenchless laying of engineering communications by punching the soil with a conical-cylindrical tip, one part of it enters the middle of the pipe for subsequent removal outside, and the other part is compacted on the sides, which reduces the total volume of soil excavation. This way of creating well is called combined. Problem. The radial compaction of the soil causes its deformation, which can be the reason for displacement and damage of the adjacent communications or other underground structures. Therefore, determination the area of its distribution in the array is essential. Goal. The aim of the study is to define the pressure on lateral surface of cone-cylindrical tip and crumple zones while forcing them to the ground. Methodology for determining ground deformation zone is based on a mathematical calculation of limit stresses in soil and knowledge about the mechanics of granular opportunities. The analysis of the technical literature showed that the zone of elastic-plastic deformation of the soil around the conical-cylindrical tip, which performs puncture of the soil and its displacement on the sides is within the range of 4 ... 6 well’s diameter, and for cylindrical tips with circular cross-sections that work by combination principle, it is within 2 diameters. In the latter case, the soil destruction zone is experimentally established for a particular type of soil with specific physical and mechanical properties. For the other types of soils, the size of this zone is not known, which does not allow to predict the influence of the zone of deformation on neighboring underground communications when laying underground communications. Results. The work provides for the theoretical calculations of the size of the zone of soil deformation by a conical-cylindrical tip and pressure on its lateral surface, depending on its parameters and properties of the soil, which is being developed. An analysis of the obtained dependence of the soil pressure on the lateral surface of the tip from the angle of the outer cone sharpening showed that the pressure value is practically independent of the ratio of the outer diameter to the internal one. Originality. Theoretical originality of obtained dependences makes possible to get a complete picture of the process of forcing ground tip cone-cylindrical shape. The greatest pressure on the outer surface of the tip occurs for the angles of cone sharpening of 30 ... 40 °, the smallest – for angles 50 ... 60 °. The calculation of the zone of destruction of soil by a tube tip with an external cone allowed establishing that the size of the destruction zone increases with the increase in the ratio of the external and internal diameters of the tip. So for the sand-clay, this ratio will be equal to 2.46 ... 3.55; for the semi-hard clay this ratio is 2.02 ... 2.85 and for the clay it is 1.91 ... 2.67. Practical value. The obtained specifications of the size of the zone of soil deformation, during the formation of the well by static crushing of the conical-cylindrical tip into the soil, can be recommended in the design of engineering networks and trenchless laying of underground communications.
Authors and Affiliations
V. Suponyev
Keywords
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- EP ID EP466540
- DOI 10.30977/BUL.2219-5548.2018.83.0.22
- Views 129
- Downloads 0
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