Surrounding rock deformation affected by mining

From the excavation to the scrapping of the mining roadway, the process of redistribution of surrounding rock stress caused by mining will be experienced, and the deformation of surrounding rock will continue to grow and change. Taking the return face of the working face affected by the mining of adjacent sections as an example, the deformation of the surrounding rock has to go through five stages:

(1) Roadway impacting stage

(2) The impact of the tunneling phase

(3) Mining impact stage

(4) Mining impact stability stage

(5) Secondary mining impact stage

See Table 6-1 for the general rule of the ratio of the speed of the top and bottom of the roadway in each impact stage.

Table 6-1 The law of the movement of the top and bottom plates in different mine pressure zones in the mining area

Mine pressure zone

The speed of the top and bottom plates in each belt is close to /mm/d

Ratio of the amount of each belt

I Tunneling Impact Zone

II No mining impact zone

The violent zone ranges from a few millimeters to tens of millimeters per day, and the stability period is generally <1 in most cases, 0.2 to 0.5, and sometimes to about 1.

III mining affects the zone before impact zone III ₁

After impact zone III ₂

IV mining affects the stability zone

V secondary mining influence zone

From a few millimeters to a dozen millimeters per day

Generally 20 to 30, a few cases up to 40 to 60

Most cases <1, sometimes up to 1~2
From ten to twenty millimeters per day, up to thirty millimeters

10 to 15%

50 to 60%

5 to 8%
20 to 25%

Copper Stripping Machine

Many home remodeling or building projects leave behind a surplus of discarded or extra materials.

In many cases this material can be resold or simply thrown away,
but copper wire is valuable as scrap metal and can be recycled to provide a few extra dollars and to help the environment.

However, most copper wire is insulated with plastic sheeting and sometimes must be stripped before it can be taken to the local recycling center.

kabel strip machine

If you work with electronics or are in an industry that requires you to remove insulation from wires frequently,

then you would do well to invest in a high quality automatic wire stripper.

Copper Stripping Machine, Copper Cable Stripping Machine, Copper Wire Stripping Machine, Scrap Copper Stripping Machine

TAIZHOU GUANGLONG WIRE STRIPPING MACHINE MANUFACTURING CO.,LTD , https://www.scrap-wire-stripper.com