The loading on U-steel yieldable support cannot be organically combined withthe law of strata behaviors from the surrounding rocks of roadway. In order to effectivelysolve the problem, U-steel yieldable support with b...The loading on U-steel yieldable support cannot be organically combined withthe law of strata behaviors from the surrounding rocks of roadway. In order to effectivelysolve the problem, U-steel yieldable support with backfill material and the performancerequirements of backfill material were analyzed on the basis of structural mechanics. Themechanical properties of backfill material selected were tested in the laboratory, and thetest results show that the ratio of the backfill material complies with the requirements ofbackfill technology; it can effectively optimize the relationship between the support and thesurrounding rock, and the filling layer can avoid the partial stress concentration and fullyimprove the support performance. Compared with U-steel yieldable support with ganguefilling, the filed application shows that the supporting result of U-steel yieldable supportwith backfill technology is satisfactory, the stress on U-steel yieldable support with backfilltechnology decreases greatly and distributes uniformly, convergence of the surroundingrock of roadway is decreased by more than 50%, and the surrounding rocks of roadwayare controlled effectively.展开更多
The study focused on occupational competencies required by secondary school graduates in palm wine tapping for sustainable income in Enugu State. Four research questions guided the study. Survey research design was ad...The study focused on occupational competencies required by secondary school graduates in palm wine tapping for sustainable income in Enugu State. Four research questions guided the study. Survey research design was adopted. It was carried out in Enugu State. The population for the study was 2,781 registered palm wine tappers. The sample for study was 556 （10%） of palm wine tappers. A random sampling technique was used for the study. A 49 structured competency item questionnaire was used for data collection. Three experts validated the instrument. Cronbach Alphal reliability method was used to determine the internal consistency of the instrument. A reliability coefficient of 0.98 was obtained. 556 copies of the questionnaire were administered to the respondents 541 copies were retrieved and analyzed using mean and standard deviation. The result revealed that 48 competencies were required by secondary school graduates in palm wine tapping occupation for sustainable income in Enugu State. Recommendation was made based on the findings of the study.展开更多
文摘The loading on U-steel yieldable support cannot be organically combined withthe law of strata behaviors from the surrounding rocks of roadway. In order to effectivelysolve the problem, U-steel yieldable support with backfill material and the performancerequirements of backfill material were analyzed on the basis of structural mechanics. Themechanical properties of backfill material selected were tested in the laboratory, and thetest results show that the ratio of the backfill material complies with the requirements ofbackfill technology; it can effectively optimize the relationship between the support and thesurrounding rock, and the filling layer can avoid the partial stress concentration and fullyimprove the support performance. Compared with U-steel yieldable support with ganguefilling, the filed application shows that the supporting result of U-steel yieldable supportwith backfill technology is satisfactory, the stress on U-steel yieldable support with backfilltechnology decreases greatly and distributes uniformly, convergence of the surroundingrock of roadway is decreased by more than 50%, and the surrounding rocks of roadwayare controlled effectively.
文摘The study focused on occupational competencies required by secondary school graduates in palm wine tapping for sustainable income in Enugu State. Four research questions guided the study. Survey research design was adopted. It was carried out in Enugu State. The population for the study was 2,781 registered palm wine tappers. The sample for study was 556 （10%） of palm wine tappers. A random sampling technique was used for the study. A 49 structured competency item questionnaire was used for data collection. Three experts validated the instrument. Cronbach Alphal reliability method was used to determine the internal consistency of the instrument. A reliability coefficient of 0.98 was obtained. 556 copies of the questionnaire were administered to the respondents 541 copies were retrieved and analyzed using mean and standard deviation. The result revealed that 48 competencies were required by secondary school graduates in palm wine tapping occupation for sustainable income in Enugu State. Recommendation was made based on the findings of the study.
