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In order to study the failure characteristics and control method of deep tunnel surrounding rock, based on the stress test, the structure and stress state of the main transportation tunnel surrounding rock in Mine Zhaogezhuang level 14 was analyzed, and it shows that the surrounding rock is exposed to an interphase hard and soft disadvantageous structure state and complex high stress repeated addition area; Through the theoretical analysis and the statistical data, the relation between the tunnel stress transformation and the surrounding rock deformation was proposed; Through the numerical simulation of the tunnel surrounding rock failure process with the help of RFPA procedure, the results show that the damage of the transportation tunnel level 14 mainly occurs in the bottom and the two coal ribs, and the failure process is spreading from the bottom to the two coal ribs, and the effect of the surrounding rock deformation control is obvious by using the way of 2.5 m anchor with 1.0 m grouting strengthening.
We have investigated in this study the destruction
of acetone and toluene with AL-KO PURE air purifier (AL-KO PURE) on industrial scale.
In the case of acetone, 100% pollutant abatement is achieved with AL-KO PURE over
more than 80 hours (the test duration time) at the high level concentration of 0.5
ppm (1187 μg/m3, about 7 times higher than the average living room level). This
corresponds to 0.2 μmol/s with a flow rate of 38.42 m3/h. The regeneration of a
saturated catalytic filter was also tested. When the catalytic filter of AL-KO PURE
is fully saturated with acetone, a 100% acetone destruction efficiency can be achieved
at 0.46 ppm concentration with 25% fan speed. Moreover the second pollutant, toluene,
has been also studied. 100% toluene abatement also is achieved with AL-KO PURE over
more than 80 hours (the test duration time) at the high level concentration of 0.2
ppm (811 μg/m3, 0.087 μmol/s with a flow rate of 38.42 m3/h). Finally, the availability
for the simultaneous removal of both pollutants, acetone and toluene, has been also