Design concepts for explosion products locking in chamber

The development of oil and gas transportation systems implies a rapid pace of trenching for laying new trunk pipelines. Carrying out such work entails solving certain engineering problems, in cases where pipe laying takes place in rocky soils, it is advisable to use explosive technologies. It is economically advantageous to lay duplicating branches that increase the capacity of gas pipelines within the boundaries of an existing land allotment. The distance between the projected and the existing pipeline varies from 10 to 50 meters. Conducting blasting operations in cramped conditions imposes a number of restrictions on ensuring the safety of main pipelines and adjacent infrastructure related to structures of the highest category of capital. The main dangerous factors of the explosion in this case can be considered the spread of the exploded rock and the seismic effect of the explosion. Usually, to reduce the spread of fragments, various gas-tight shelters are used that can hold pieces of exploded rock. The article shows that when calculating the seismic effect of an explosion, it is necessary to take into account the length of the exploding block relative to the distance to the protected object. However, when the length of the exploding block is two or more times the distance to the protected object, the measured values of the total vector velocity exceed the calculated ones. To take this feature into account, it is proposed to introduce a correction facto. K into the calculation formulas, taking into account the length of the exploding block and depending on the relative distance (with Rn = 2, K = 1.3; Rn = 3, K = 1.5; Rn = 5, K = 1.7).

Sokolov S. T., Khokhlov S. V., Bazhenova A. V. Design concepts for explosion products locking in chamber. MIAB. Mining Inf. Anal. Bull. 2023;(9-1):122-134. [In Russ]. DOI: 10.25018/0236_1493_2023_91_0_122.

S.T. Sokolov¹, Cand. Sci. (Eng.), Assistant, e-mail: Sokolov_ST@pers.spmi.ru, ORCID ID: 0000-0003-3153-7874,
S.V. Khokhlov¹, Cand. Sci. (Eng.), Assistant Professor, e-mail: Khokhlov_sv@pers.spmi.ru, ORCID ID: 0000-0003-1040-8328,
A.V. Bazhenova¹, Graduate Student, e-mail: s195054@stud.spmi.ru, ORCID ID: 0002-8155-2258,
¹ Saint-Petersburg Mining University, 199106, Saint-Petersburg, Russia.

S.T. Sokolov, e-mail: Sokolov_ST@pers.spmi.ru.

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