Maqolada ommaviy portlatilgan jinslarning o'rtacha o'lchamlarini aniqlash keltirilgan. Ko'p karrali portlatish zur-iqmasi orqali kon jinslarini mustahkamlik chegarasini kamayishi, mikro- va makrodarzliklarning paydo bo'lishi tavsifla-nadi: siqilishga 28-45%, chuzilishga 38-60% ekanligi tog' jinsining statik mustahkamligiga bog'liq ekanligi aniqlandi. Portlatilgan kon massasining or'tacha o'lchamlari parabolik qonuniyat bo'yicha o'zgarishi bo'zmasdan portlatiladigan zuriqishlar soni va uning amplitudasi, hamda portlovchi moddaning solishtirma sarfiga bog'liqligi aniqlandi.

Tayanch iboralar: tog' jinsi, ommaviy portlatish, ko'p karrali portlash zuriqmasi, mikro– va makrodarzliklar, mustahkamligining kamayishi, statik mustahkamlik,portlatilgan kon massasining o'rtacha o'lchami, portlatish zuriqmasi, amplituda, solishtirma sarf, portlovchi modda, , siqilishga va cho'zilishga mustahkamligi.

The article considers the definition of the average size of a blasted rock piece during mass explosions. A reduction in the rock strength limit is described, characterized by the appearance of micro- and macro-tritium under the action of multiple explosive loads: during compression by 28-45%, while stretching by 38-60%, depending on the limit of the static strength of the rocks. Parabolic regularities are established for the change in the average size of the blasted rock mass, depending on the number of cycles of nondestructive explosive loading and their amplitude, as well as the specific consumption of explosives.

Key words: rocks, mass explosion, multi-cyclical explosive load, micro and macro cracks, strength decrease, statisti-cal strength, average size of the blasted rock, explosive loading, amplitude, specific consumption, explosives, statistical strength, compressive strength and tensile strength.