Published on: 2026-08-21
Source: Saint Petersburg State University of Architecture and Civil Engineering –
An important disclaimer is at the bottom of this article.
A scientifically grounded approach to calculating the main technological parameters and selecting equipment for implementing the jet grouting technology of soils has been developed at the Saint Petersburg State University of Architecture and Civil Engineering.
The research was conducted by a lecturer of the Department of Forensic Expertise at the Faculty of Forensic Expertise and Law in Construction and Transport, a Candidate of Technical Sciences. Vitaly Novikov. The research work was carried out within the framework of grant support from SPbGASU.
Vitaliy Novikov
Jet grouting of soils is used to strengthen foundations and bases, including in complex engineering and geological conditions. The effectiveness of the technology depends on the correct choice of technological parameters – the diameter of the jet-forming nozzle, the flow rate of the working fluid, the rotation frequency and lifting speed of the drill string, as well as the selection of equipment.
The purpose of the study was to develop a draft regulatory document that would standardize the procedure for calculating the main parameters of jet grouting and selecting the set of equipment for its implementation.
Within the work, an analysis of existing approaches to calculating the parameters of the technology and designs of the equipment used was carried out. Based on this, a methodology is developed that links the parameters of the soil stabilization technology with the characteristics of the pump unit, drilling string, and hydraulic extractor.
Special attention is given to the high-pressure transmission device – the hydraulic lifter. Dependencies necessary for determining its geometric characteristics have been studied, and an assessment of the thermal state in the contact zone of the sealing elements with the shaft has been carried out. The calculations take into account surface quality, material properties, and the technological parameters of the employed technology.
The developed approach allows for the evaluation of thermal loads and energy losses related to friction in seals during the design stage, and for determining the parameters necessary for the reliable operation of the hydraulic grab. The obtained dependencies can be used when assigning technological modes that ensure the required diameter of the anchored soil mass, as well as when selecting the equipment set.
One of the results of the research was obtaining the Russian Federation patent for utility model No. 243687 “High-pressure transmitting device”. The patent holder is Saint Petersburg State University of Architecture and Civil Engineering, the authors are – Vitaly Novikov, Professor of the Department of Ground Transport and Technological Machines at SPbGASU, Doctor of Technical Sciences Alexander Pushkarev and Associate Professor of the Department of Land Transport and Technological Machines, Candidate of Technical Sciences Angelika Abrosimova. The state registration of the utility model took place on May 25, 2026.
The patent complements the methodology developed within the R&D project and reflects the research results on improving transmission devices for hydro-jet technologies.
Two scientific articles have been prepared on the research topic for publication in journals listed in the Higher Attestation Commission registry: “Simulation modeling of thermal fields in transmission devices for hydrojet technologies using the finite element method” and “Investigation of the influence of shaft surface roughness level on the friction coefficient in the hydraulic quick-change coupling for jet grouting of soils.” An article titled “Influence of external thermal factors on the thermal balance of transmission devices for hydrojet technologies” has been published.
The research results can be applied by design and construction organizations in the preparation of work production projects for soil reinforcement using the jet grouting method. The developed approaches may also be in demand for the design, reliability assessment, and modernization of highly loaded components of construction and road machinery that use hydraulic jet impact on soils and rocks.
The research materials will also be used in the educational process at SPbGASU during the training of specialists in the relevant field.
The news is published based on the results of the execution of the SPbGASU 2026 grant.
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