降震
1.The results show that two detonating network systems with high reliability are obvious in reduction of blasting vibration and possible to ensure the safety of 290m adit.
2.The technology could greatly improve blasting effect and efficiency,dramatically reduce blasting vibration,secure the safety use of side drift and slide in its service time and facilitate the protection of the stability of high and steep slope.
3.Through analyzing the blasting vibration test data,the fact could be found that the average vibrating velocity of down-role-hole MS blasting was reduced by 26.66%,compared with that of down-hole slice MS blasting,and reduced by 43.85%,compared with that of row-hole MS blasting. The down-role-hole MS blasting could have a dramatic vibration reduction function and hence could protect the adit effectively.
4.For the MgO and MgO-5mol%ZrO2 samples sintered at 1780℃ thevalues of relative density, bending strength at RT and 1400℃ are respectively 83% and 95%, 53. 6MPa and1 08. 5MPa, 7. 2MPa and 67. 5MPa. The ability of thermal shock resistance increases with the increase of ZrO2 content.
5.Analysis and tests on the data of small earthquakes collected from four seismic stations in the Xinfengjiang reservoir region show that the mean quality factor of the medium is about 450,the seismic moment being 1019-1020 dyn cm and the mean stress drop being 35 bar or so;
6.The pre-seismic and post-seismic stress direction can be statistically determined by a large collection of foreshock and aftershock focal mechanism data while the stress drop can be determined through the source fracture inversion from seismic wave data or crust deformation data.
7.An earthquake of 5.9 magnitude in Heze county occurred on November 7 , 1983. Anomaly of altitude in the epicentral area began in 1980 and the change rate increase evidently in one year before the earthquake, The deformation is characterized by surface rise of west-side of the Liaokao Fault Zone relative to east-side of the fault, a relative change amplitude between the two sides accounting for 14.8 mm and approximating to three times of two times standard error.
