USE OF BURNED ROCKS IN UNDERGROUND LAYING OF CABLE LINES IN THE CRYOLITZONE

Abstract

The relevanceof the research is caused by the need to develop natural resources and expand the residential areas of the arctic regions of the Russian Federation. The development of these territories in the permafrost zone is complicated by the negative influence of cryogenic processes on the construction and operation of linear engineering structures, in particular, on the underground laying of cable communication lines. The main aim of the research is tosubstantiate and develop a new technology for underground laying of cable communication lines that minimizes the impact of negative cryogenic processes, in particular, frost cracking of soils, on the reliability of operation, without significantly increasing the complexity of laying cables on the main and residential areas. Objects: trunk and residential sections of underground cable lines during construction and operation. Methods: analytical calculations of the temperature regime of frozen soils in order to select the optimal concentration of an aqueous solution of ethylene glycol to create an artificial protective soil zone around the cable; laboratory studies of the slopes of the Kildyamskoe field to assess the feasibility of their use as a protective rock zone around the cable. Results. The main features of laying cable communication lines in the permafrost zone are analyzed. It was established that the main factor negatively affecting the reliability of cable communication is cryogenic processes. In particular, frost cracking of the soil of the active layer, which leads to rupture of the cables. The main methods of combating frost cracking of soils to protect cables are reviewed and analyzed. It is established that the methods used are either ineffective or economically costly. A new technology of underground laying is proposed that increases the reliability of cable communication lines in the permafrost zone. The essence of the new technology is that during cable laying, a part of the natural soil is replaced with hydrophilic rock, which is pre-saturated preliminary or directly in the trench with an ice-free aqueous solution of ethylene glycol. A formula is obtained for the optimal concentration of an aqueous solution of ethylene glycol depending on the depth of the cable. The advantage of the proposed technology for underground cable laying is that it becomes possible to protect large linear sections of soil that are subject to frost cracking.

Keywords

• burned rocks
• protection
• cable
• frozen soil
• cryosphere
• frost cracks
• reliability
• method
• ethylene glycol