Labor safety in laying of underground utilities

Discovery of new mineral occurrences often entails re-laying of the existing underground utilities in unstable ground, which is an engineering challenge. Secant piles perform an important function of wall reinforcement in working trenches and prevent ground falls induced by soil water head. The article presents the results of acoustic defectoscopy aimed to assess integrity of piles in working trenches in re-laying of underground utilities. The test piles were placed in the pilot and intaking trenches for the transference of network utilities. The critical nature of the pile quality control is governed by the labor safety in re-laying of underground utilities. The test results of the secant piles are presented. It is found that the acoustic wave is reflected from the interface of two different soil types and creates false defects in the form of peaks in the signal curve. This may disorient engineers as the peaks may be taken as the real defects in the piles. Thus, the purity of a signal depends on the uniformity of soil around a pile. Another factor of the signal distortion is the jet cementation in soil reinforcement. The ground water cutoffs are designed for the operation safety. The results have a practical value in interpretation of reflectograms, and enable empirical identification of noisy signals and elimination of defects.

Korol E.A., Degaev E.N., Koniukhov D.S. Labor safety in laying of underground utilities. MIAB. Mining Inf. Anal. Bull. 2024;(2):129-139. [In Russ]. DOI: 10.25018/ 0236_1493_2024_2_0_129.

E.A. Korol¹, Doctor Sci. (Eng.), Professor, e-mail: korolea@mgsu.ru
E.N. Degaev¹, Cand. Sci. (Eng.), Assistant Professor, e-mail: degaev@inbox.ru
D.S. Koniukhov, Doctor Sci. (Eng.), Assistant Professor, National University of Science and Technology «MISiS», 119049, Moscow, Russia, e-mail: gidrotehnik@inbox.ru,
¹ Moscow State University of Civil Engineering (National Research University), 129337, Moscow, Russia.

E.N. Degaev, e-mail: degaev@inbox.ru.

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