Test study of the perturbation effect of coal measures rocks damage failure
Abstract：An existing coal and rock step-load perturbation test system was used to carry out typical uniaxial compression tests, non-perturbation step-load tests, and step-load tests with different perturbation rates and ranges on coal rocks. During the tests, AE signals were col- lected and analyzed using loading-unloading response ratio （LURR） theory. The results show that the compressive strength of the rock decreased dramatically under the conditions of per- turbed loads. Nine samples exhibited a decrease in compressive strength of 20--60 kN （about 10~//00 to 250//00 of the ultimate compression strength）. Compared to the load change （from 2.5 kN up to 5 kN）, the increase in perturbation rate （from 650 N/s up to 1 kN/s） has a much more obvious influence on the measured rock strength. The AE energy corresponds well with the load route~ the loading-unloading response ratio first decreased and then increased with an increase in load level.
Keywords：coal measures rocksdamage failureperturbation effectloading-unloading response ratio（LURR）
Publication Date：2011-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)